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  1. Employees

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Norsk

Roy Johnsen

Last ned pressefoto
Last ned pressefoto
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Roy Johnsen

Professor
Department of Mechanical and Industrial Engineering

roy.johnsen@ntnu.no
73592925 93245101 Materialteknisk, Gløshaugen
Om Publikasjoner Undervisning Formidling

Om

Information about myself

After receiving a Dr.ing. degree from NTH in 1984, I joined Statoil Research Centre in Trondheim in 1985 to work within their “Material Technology” group.  During this period I was involved in several research projects, material selection activities for new fields and failure analysis for existing fields.  I also worked as Department Manager for some years.

In 1991 I joined CorrOcean in a combined management/technical position to develop the company from a small national company to be a leading international company within “Corrosion monitoring and corrosion management”.  During my 13 years with CorrOcean the company grew from 30 people to 350 people with activities in all the major oil regions in the world.  I also got the opportunity to visit the most important regions with oil activities in the world including Asia, Australia , South America, North America and Europe working with the leading oil companies and supplier industry.  During my years in CorrOcean the company was listed on the Oslo Stock Exchange.

After 20 years in oil industry I accepted an offer to be a Professor within “Corrosion and Surface Technology” at IPM in 2004.  I still have good contact with the industry and use my contact and experience to develop my courses and to get interesting industrial related projects both for master students and for PhD candidates.

I am present manager for the Strategic Area Materials (Tematisk Satsingsområde Materialer) at NTNU.

Fields of interest

  • Material technology for the oil industry
  • Corrosion of metallic materials for the process industry
  • Corrosion protection by cathodic protection and/or coating
  • Corrosion, erosion and wear resistant materials and surfaces
  • Tribology (including tribo-corrosion)
  • Integrity management of  production systems
  • Hydrogen embrittlement of metals

Research

In the following is given a short presentation of the main research projects I’m involved in:

HISC - Hydrogen induced stress cracking of stainless steels
(2005 – 2011) JIP sponsored by Statoil, ConocoPhillips, Total, Shell, Petrobras, Chevron and supply industry.

Prevention of hydrogen induced stress cracking (HISC) in subsea pipelines and production systems made from stainless steels
(2006- 2012)   Project sponsored by the Norwegian Research Council through the Petromaks program.

NODE Advanced Riser Tensioning project
(2007-2010) Project sponsored by the Norwegian Research Council through the Petromaks program together with National Oilwell Varco, Aker Solutions Maritime Hydraulics, Bosch Rexroth, Umoe Mandal, Statoil.

Pulsed plasma surface treatment (PPST) – effect on hydrogen embrittlement and hydrogen absorption and diffusion
(2009-2012) JIP sponsored by Total, Aker Solutions, FMC Kongsberg and MoTECH Plasma.

Smartpipe
(2006-2010)  Project sponsored by the Norwegian Research Council through the Petromaks program together with oil companies and service industry.

NOWITECH – Norwegian Research Centre for OffshoreWind (2009-2015)  FME sponsored by The Norwegian Research Council and the industry.  Participating in activities related to optimization of maintenance including coating technology.

Courses

  • TMM4100 / TMM4105 -  Materialteknikk
  • TMM4170 / TMT4255 - Corrosion and corrosion protection
  • TMM4205 - Tribology and Surface technology
  • TMM4535 - Robust material selection and design – offshore applications

Publikasjoner

  • Kronologisk
  • Etter kategori
  • Se alle publikasjoner i Cristin

2024

  • Sharma, Suraksha; Bjerk, Christoffer; Geiker, Mette Rica; Johnsen, Roy. (2024) Summary of inspections and investigations on post-tensioning components of Herøysund Bridge, Norway (2017-2023). NTNU, Department of Structural Engineering
    Report
  • Jemblie, Lise; Hagen, Anette Brocks; Hagen, Catalina Hoem Musinoi; Nyhus, Bård; Alvaro, Antonio; Wang, Dong. (2024) Safe pipelines for hydrogen transport. International Journal of Hydrogen Energy
    Academic article
  • Koren, Erik Aas; Yamabe, Junichiro; Lu, Xu; Hagen, Catalina Hoem Musinoi; Wang, Dong; Johnsen, Roy. (2024) Hydrogen diffusivity in X65 pipeline steel: Desorption and permeation studies. International Journal of Hydrogen Energy
    Academic article
  • Deconinck, Liesbet; Lu, Xu; Wang, Dong; Johnsen, Roy; Verbeken, Kim; Depover, Tom. (2024) Multiscale evaluation of hydrogen-assisted mechanical degradation in grade 2 titanium. Journal of Alloys and Compounds
    Academic article
  • Deconinck, Liesbet; Lu, Xu; Wang, Dong; Johnsen, Roy; Verbeken, Kim; Depover, Tom. (2024) Hydrogen enhanced localised plasticity of single grain α titanium verified by in-situ hydrogen microcantilever bending. International Journal of Hydrogen Energy
    Academic article
  • Lu, Xu; Johnsen, Roy. (2024) Hydrogen diffusion and uptake in nickel Alloy 625 under cathodic protection conditions. Heliyon
    Academic article

2023

  • Vatn, Jørn; Johnsen, Roy. (2023) Kjernekraft. Det er fali’ det – eller?. Adressa/Midtnorskdebatt
    Reader opinion piece
  • Olden, Vigdis; Johnsen, Roy; Jemblie, Lise; Hagen, Anette Brocks; Hagen, Catalina Hoem Musinoi; Zhang, Zhiliang. (2023) International Hydrogen and Materials Integrity Workshop 2023.
    Other product
  • Karimi, Shabnam; Taji, Iman; Palencsar, Simona; Dugstad, Arne; Hajilou, Tarlan; Barnoush, Afrooz. (2023) Evaluation of microstructural and environmental effects on the hydrogen uptake and desorption in high-strength carbon steels: A thermal desorption spectroscopy study. Corrosion Science
    Academic article
  • Lu, Xu; Kattuputhur Soundararajan, Chandrahaasan; Wang, Dong; Johnsen, Roy. (2023) Failure investigation of Alloy 725 drive screw. Technical report
    Report
  • Karimi, Shabnam; Taji, Iman; Hajilou, Tarlan; Palencsar, Simona; Dugstad, Arne; Barnoush, Afrooz. (2023) Role of cementite morphology on corrosion layer formation of high-strength carbon steels in sweet and sour environments. Corrosion Science
    Academic article
  • Lu, Xu; Ma, Yan; Ma, Yuan; Wang, Dong; Gao, Lei; Song, Wenwen. (2023) Unravelling the effect of F phase on hydrogen-assisted intergranular cracking in nickel-based Alloy 725: Experimental and DFT study. Corrosion Science
    Academic article
  • Blücher, Daniel; Johnsen, Roy. (2023) Rustfritt stål er ikke alltid rustfritt. Teknisk Ukeblad
    Feature article
  • Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2023) Experimental comparison of gaseous and electrochemical hydrogen charging in X65 pipeline steel using the permeation technique. Corrosion Science
    Academic article
  • Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy. (2023) Investigating electrochemical charging conditions equivalent to hydrogen gas exposure of X65 pipeline steel. Materials and corrosion - Werkstoffe und Korrosion
    Academic article

2022

  • Bengtsson Blucher, Daniel; Knudsen, Ole Øystein; Brakstad, Odd Gunnar; Hakvåg, Sigrid; Johnsen, Roy. (2022) Korrosjon av Stål i Ferskvann. sintef as
    Report
  • Lu, Xu; Díaz, Andrés; Ma, Jun; Wang, Dong; He, Jianying; Zhang, Zhiliang. (2022) The effect of plastic deformation on hydrogen diffusion in nickel Alloy 625. Scripta Materialia
    Academic article
  • Wang, Dong; Hagen, Anette Brocks; Undrum Fathi, Pernille; Lin, Meichao; Johnsen, Roy; Lu, Xu. (2022) Investigation of hydrogen embrittlement behavior in X65 pipeline steel under different hydrogen charging conditions. Materials Science & Engineering: A
    Academic article
  • Lu, Xu; Ma, Yan; Peng, Ding; Johnsen, Roy; Wang, Dong. (2022) In situ nanomechanical characterization of hydrogen effects on nickel-based alloy 725 under different metallurgical conditions. Journal of Materials Science & Technology
    Academic article
  • Taji, Iman; Hajilou, Tarlan; Ebner, Anna Sophie; Scheiber, Daniel; Karimi, Shabnam; Plesiutschnig, Ernst. (2022) Hydrogen assisted intergranular cracking of alloy 725: The effect of boron and copper alloying. Corrosion Science
    Academic article
  • Hornus, Edgar; Vouilloz, Francisco; Long, Yu; Andersen, Kjetil; Krosness, Ola; King, Mike. (2022) Growth Kinetics of Calcareous Deposits on Thermally Sprayed Aluminum Coatings in Natural Seawater. Corrosion
    Academic article
  • Lu, Xu; Depover, Tom; Johnsen, Roy. (2022) Evaluation of hydrogen diffusion and trapping in nickel Alloy 625 by thermal desorption spectroscopy. International Journal of Hydrogen Energy
    Academic article
  • Lu, Xu; Wang, Dong; Wan, Di; Guo, Xiaofei; Johnsen, Roy. (2022) Reveal hydrogen behavior at grain boundaries in Fe-22Mn-0.6C TWIP steel via in-situ micropillar compression test. Acta Metallurgica Sinica (English Letters)
    Academic article
  • Skilbred, Ellen Synnøve; Palencsar, Simona; Dugstad, Arne; Johnsen, Roy. (2022) Hydrogen uptake during active CO2-H2S corrosion of carbon steel wires in simulated annulus fluid. Corrosion Science
    Academic article
  • Lu, Xu; Wang, Dong; Johnsen, Roy. (2022) Hydrogen diffusion and trapping in nickel-based alloy 625: An electrochemical permeation study. Electrochimica Acta
    Academic article
  • Karimi, Shabnam; Taji, Iman; Hajilou, Tarlan; Barnoush, Afrooz; Johnsen, Roy. (2022) Evaluation of the cementite morphology influence on the hydrogen induced crack nucleation and propagation path in carbon steels. International Journal of Hydrogen Energy
    Academic article
  • Maicas Esteve, Héctor; Taji, Iman; Wilms, Marc; Gonzalez-Garcia, Yaiza; Johnsen, Roy. (2022) Corrosion and Microstructural Investigation on Additively Manufactured 316L Stainless Steel: Experimental and Statistical Approach. Materials
    Academic article
  • Taji, Iman; Hajilou, Tarlan; Karimi, Shabnam; Schott, Florian; Plesiutschnig, Ernst; Barnoush, Afrooz. (2022) Role of grain boundaries in hydrogen embrittlement of alloy 725: single and bi-crystal microcantilever bending study. International Journal of Hydrogen Energy
    Academic article

2021

  • Skilbred, Ellen Synnøve; Kappes, Mariano; Iannuzzi, Mariano; Johnsen, Roy. (2021) Hydrogen uptake and diffusivity in steel armor wires with different chemical composition, carbide distribution, grain size, and degree of deformation. Materials and corrosion - Werkstoffe und Korrosion
    Academic article
  • Parow, Hanna; Johnsen, Roy; Skovhus, Torben Lund. (2021) MIC in the Fire Water Sprinkler System at St. Olavs Hospital, Trondheim, Norway. CRC Press
    Academic chapter/article/Conference paper
  • Wang, Dong; Hagen, Anette Brocks; Wan, Di; Lu, Xu; Johnsen, Roy. (2021) Probing hydrogen effect on nanomechanical properties of X65 pipeline steel using in-situ electrochemical nanoindentation. Materials Science & Engineering: A
    Academic article
  • Wang, Dong; Lu, Xu; Lin, Meichao; Wan, Di; Li, Zhiming; He, Jianying. (2021) Understanding the hydrogen effect on pop-in behavior of an equiatomic high-entropy alloy during in-situ nanoindentation. Journal of Materials Science & Technology
    Academic article
  • Wang, Dong; Lu, Xu; Wan, Di; Guo, Xiaofei; Johnsen, Roy. (2021) Effect of hydrogen on the embrittlement susceptibility of Fe-22Mn-0.6C TWIP steel revealed by in-situ tensile tests. Materials Science & Engineering: A
    Academic article
  • Torres Rodriguez, Cristian; Johnsen, Roy; Iannuzzi, Mariano. (2021) Crevice corrosion of solution annealed 25Cr duplex stainless steels: Effect of W on critical temperatures. Corrosion Science
    Academic article

2020

  • Skilbred, Ellen Synnøve; Lootz, Signe Aarthun; Johnsen, Roy. (2020) Hydrogen Embrittlement Susceptibility of Steel Armor Wires for Flexible Pipes. International Corrosion Conference Series
    Academic article
  • Stenerud, Gaute; Hajilou, Tarlan; Olsen, Jim Stian; Taji, Iman; Barnoush, Afrooz; Johnsen, Roy. (2020) The Effect of Hydrogen on the Nanoindentation Behavior of Heat Treated 718 Alloy. Metals
    Academic article
  • Lervik, Adrian; Walmsley, John; Lodgaard, Lars; Marioara, Calin Daniel; Johnsen, Roy; Lunder, Otto. (2020) Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy. Metals
    Academic article
  • Torres Rodriguez, Cristian; Hazarabedian, Maria Sofia; Quadir, Zakaria; Johnsen, Roy; Iannuzzi, Mariano. (2020) The Role of Tungsten on the Phase Transformation Kinetics and its Correlation with the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels. Journal of the Electrochemical Society
    Academic article
  • Torres Rodriguez, Cristian; Iannuzzi, Mariano; Johnsen, Roy. (2020) Use of the Critical Acidification Model to Estimate the Influence of W in the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels. Metals
    Academic article

2019

  • Kheradmand, Nousha; Rogne, Bjørn Rune Sørås; Dumoulin, Stephane; Deng, Yun; Johnsen, Roy; Barnoush, Afrooz. (2019) Small scale testing approach to reveal specific features of slip behavior in BCC metals. Acta Materialia
    Academic article
  • Johnsen, Roy; Gjelseng, Linn Cecilie; Heimsæter, Martin Arne; Jernberg, Anders; Qvale, Atle H. (2019) Influence of Manufacturing Process and Resulting Microstructure on HISC Susceptibility of 25Cr Duplex Stainless Steel Pipe. International Corrosion Conference Series
    Academic article
  • Wilson, Håvard; Johnsen, Roy; Torres Rodriguez, Cristian; Hesjevik, Sven Morten. (2019) Properties of TSA in natural seawater at ambient and elevated temperature. Materials and corrosion - Werkstoffe und Korrosion
    Academic article
  • Stefansson, Njall; Dunn, John; Strand, Einar; Johnsen, Roy; Heimsæter, Martin Arne. (2019) Performance of high strength UNS N08830 in hydrogen stress crack testing to simulate conditions arising from subsea cathodic protection. International Corrosion Conference Series
    Academic article
  • Ingdal, Mats; Johnsen, Roy; Harrington, David A.. (2019) The Akaike information criterion in weighted regression of immittance data. Electrochimica Acta
    Academic article
  • Torres Rodriguez, Cristian; Johnsen, Roy; Østvold, Hege Kokslien; Bernås, Mia; Iannuzzi, Mariano. (2019) Effect ofW on Phase Transformation Kinetics and its Correlation with Localized Corrosion Resistance for UNS S39274. International Corrosion Conference Series
    Academic article
  • Johnsen, Roy; Olavesen, Henrik Horten; Hossein Zavieh, Amin; Erlien, Tomas Laugsand. (2019) Effect of cathodic polarization on localized corrosion of 25Cr in seawater. International Corrosion Conference Series
    Academic article

2018

  • Hajilou, Tarlan; Hope, Malin Sofie B.; Hossein Zavieh, Amin; Kheradmand, Nousha; Johnsen, Roy; Barnoush, Afrooz. (2018) In situ small-scale hydrogen embrittlement testing made easy: An electrolyte for preserving surface integrity at nano-scale during hydrogen charging. International Journal of Hydrogen Energy
    Academic article
  • Johnsen, Roy; Lange, Torstein; Stenerud, Gaute; Olsen, Jim Stian. (2018) Environmentally assisted degradation of spinodal copper alloy C72900. Corrosion Science
    Academic article
  • Ryen, Audun; Johnsen, Roy; Iannuzzi, Mariano; Årtun, Lars. (2018) Cathodic protection by distributed sacrificial anodes - Performance at elevated temperature and in mud. International Corrosion Conference Series
    Academic article
  • Wold, Kristian; Johnsen, Roy; Iannuzzi, Mariano; Årtun, Lars. (2018) Integrated cathodic protection (CP) sensor network development of the CP sensor. International Corrosion Conference Series
    Academic article
  • Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian. (2018) Hydrogen stress cracking and crack initiation in precipitation hardened Ni-alloys. Engineering Failure Analysis
    Academic article
  • Stenerud, Gaute; Wenner, Sigurd; Olsen, Jim Stian; Johnsen, Roy. (2018) Effect of different microstructural features on the hydrogen embrittlement susceptibility of alloy 718. International Journal of Hydrogen Energy
    Academic article
  • Husby, Hans; Wagstaff, Philip Haakon; Iannuzzi, Mariano; Johnsen, Roy; Kappes, Mariano A. (2018) Effect of Nickel on the Hydrogen Stress Cracking Resistance of Ferritic/Pearlitic Low Alloy Steels. Corrosion
    Academic article
  • Bernås, Mia; Westermann, Ida; Johnsen, Roy; Torres Rodriguez, Cristian; Jernberg, Anders; Qvale, Atle H. (2018) Effect of tungsten on the precipitation kinetics and localized corrosion resistance of super duplex stainless steels. International Corrosion Conference Series
    Academic article
  • Krogstad, Hedda Nordby; Johnsen, Roy; Coey, Michael. (2018) Effect of a uniform magnetic field on corrosion of Ni-Al bronze in 3.5wt% NaCl. Corrosion
    Academic article
  • Krogstad, Hedda Nordby; Johnsen, Roy; Coey, Michael. (2018) Effect of a time-dependent magnetic field on the corrosion of Ni-Al bronze. Corrosion
    Academic article
  • Torres Rodriguez, Cristian; Kappes, Mariano A; Johnsen, Roy; Iannuzzi, Mariano. (2018) Influence of tungsten on passivity breakdown and repassivation of 25CR super duplex stainless steel. International Corrosion Conference Series
    Academic article
  • Husby, Hans; Iannuzzi, Mariano; Johnsen, Roy; Mariano, Kappes; Barnoush, Afrooz. (2018) Effect of nickel on hydrogen permeation in ferritic/ pearlitic low alloy steels. International Journal of Hydrogen Energy
    Academic article

2017

  • Iannuzzi, Mariano; Barnoush, Afrooz; Johnsen, Roy. (2017) Materials and corrosion trends in offshore and subsea oil and gas production. npj Materials Degradation
    Academic article
  • Bernås, Mia; Westermann, Ida; Johnsen, Roy; Lauritsen, Christian; Iannuzzi, Mariano. (2017) Effect of microstructure on the corrosion resistance of duplex stainless steels: Materials performance maps. International Corrosion Conference Series
    Academic article
  • Krogstad, Hedda Nordby; Johnsen, Roy. (2017) Corrosion properties of nickel-aluminium bronze in natural seawater?Effect of galvanic coupling to UNS S31603. Corrosion Science
    Academic article
  • Haugan, Eirik; Næss, Monika; Torres Rodriguez, Cristian; Johnsen, Roy; Iannuzzi, Mariano. (2017) Effect of tungsten on the pitting and crevice corrosion resistance of Type 25Cr super duplex stainless steels. Corrosion
    Academic article
  • Farhat, Hanan; Johnsen, Roy. (2017) Hydrogen sulfide tube failure in a seawater heat exchanger. Materials performance
    Academic article
  • Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian; He, Jianying; Barnoush, Afrooz. (2017) Effect of hydrogen on dislocation nucleation in alloy 718. International Journal of Hydrogen Energy
    Academic article
  • Quale, Geir; Iannuzzi, Mariano; Johnsen, Roy. (2017) Cathodic protection by distributed sacrificial anodes - A new cost-effective solution to prevent corrosion of subsea structures. International Corrosion Conference Series
    Academic article
  • Krogstad, Hedda Nordby; Skilbred, Ellen Synnøve; Johnsen, Roy. (2017) Corrosion of nickel aluminium bronze - Effect of alloying elements and pH. International Corrosion Conference Series
    Academic article
  • Krogstad, Hedda Nordby; Johnsen, Roy; Coey, M. (2017) Corrosion of nickel aluminium bronze - Effect of a uniform magnetic field. International Corrosion Conference Series
    Academic article
  • Johnsen, Roy; Nese, Ove. (2017) AA5083 and AA6082 exposed to seawater - Effect of potential on corrosion behaviour. International Corrosion Conference Series
    Academic article

2016

  • Lange, Torstein; Bengtsson Blucher, Daniel; Venkataraman, Shankar; Jakobi, Dietinde; Asteman, Henrik; Johnsen, Roy. (2016) A new cast Ni-base alloy suitable for severe sour service. International Corrosion Conference Series
    Academic article
  • Næss, Monika; Johnsen, Roy; Haugan, Eirik Bjørge; Iannuzzi, Mariano. (2016) Effect of tungsten on pitting and crevice corrosion of type 25Cr super duplex stainless steel. International Corrosion Conference Series
    Academic article
  • Kheradmand, Nousha; Johnsen, Roy; Olsen, Jim Stian; Barnoush, Afrooz. (2016) Effect of Hydrogen on the hardness of different phases in super duplex stainless steel. International Journal of Hydrogen Energy
    Academic article

2015

  • Næss, Monika E; Iannuzzi, Mariano; Johnsen, Roy. (2015) Use of electrochemical techniques to determine the effect of sigma (σ)-phase precipitation on a 25 wt% CR super duplex stainless steel. International Corrosion Conference Series
    Academic article
  • Holager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2015) Corrosion of thermally sprayed aluminum in flowing seawater. International Corrosion Conference Series
    Academic article
  • Castberg, Tore Støren; Johnsen, Roy; Berget, J. (2015) Corrosion and subsequent erosion of hardmetals: Dependence of WC grain size and distribution, and binder composition. Materials and corrosion - Werkstoffe und Korrosion
    Academic article
  • Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian. (2015) Susceptibility to Hydrogen Induced Stress Cracking of UNS N07718 and UNS N07725 under cathodic polarization. International Corrosion Conference Series
    Academic article

2014

  • Olden, Vigdis; Saai, Afaf; Jemblie, Lise; Johnsen, Roy. (2014) FE simulation of hydrogen diffusion in duplex stainless steel. International Journal of Hydrogen Energy
    Academic article

2013

  • Barnoush, Afrooz; Asgari, Masoud; Johnsen, Roy; Hoel, Rune. (2013) Hydrogen Effect on Nanomechanical Properties of the Nitrided Steel. Metallurgical and Materials Transactions A
    Academic article
  • Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2013) Small-scale structural and mechanical characterization of the nitrided layer in martensitic steel. Tribology International
    Academic article
  • Brataas, Arne; Mathiesen, Ragnvald; Grande, Tor; Roven, Hans Jørgen; Grepstad, Jostein; Echtermeyer, Andreas. (2013) Enabling technologies at NTNU; materials science and engineering. NTNU
    Report
  • Espallargas, Nuria; Johnsen, Roy; Torres, Christian Rodriguez; Igual Munoz, Anna. (2013) A new experimental technique for quantifying the galvanic coupling effects on stainless steel during tribocorrosion under equilibrium conditions. Wear
    Academic article
  • Asgari, Masoud; Johnsen, Roy; Barnoush, Afrooz. (2013) Nanomechanical characterization of the hydrogen effect on pulsed plasma nitrided super duplex stainless steel. International Journal of Hydrogen Energy
    Academic article
  • Baltzersen, Øystein; Johnsen, Roy; Martinussen, H; Nerbø, Ingar Stian. (2013) Using permanently installed ultrasound monitoring to maximize the lifetime of a pipeline. International Corrosion Conference Series
    Academic article
  • Asgari, Masoud; S. Azar, Amin; Barnoush, Afrooz; Johnsen, Roy. (2013) Orientation Relationships and Texture of the Iron-Nitride Phase Constituents in Pulsed Plasma Nitriding. Metallurgical and Materials Transactions A
    Academic article
  • Castberg, Tore Støren; Johnsen, Roy; Berget, John. (2013) Erosion of hardmetals: Dependence of WC grain size and distribution, and binder composition. Wear
    Academic article

2012

  • Von der Ohe, Christian Bertil; Johnsen, Roy; Espallargas, Nuria. (2012) Multi-degradation behavior of austenitic and super duplex stainless steel - The effect of 4-point static and cyclic bending applied to a simulated seawater tribocorrosion system. Wear
    Academic article
  • Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2012) Nanomechanical evaluation of the protectiveness of nitrided layers against hydrogen embrittlement. Corrosion Science
    Academic article
  • Barnoush, Afrooz; Asgari, Masoud; Johnsen, Roy. (2012) Resolving the hydrogen effect on dislocation nucleation and mobility by electrochemical nanoindentation. Scripta Materialia
    Academic article
  • Perez Ramirez, Pedro Agustin; Johnsen, Roy; Utne, Ingrid Bouwer. (2012) Probabilistic condition assessment of aging equipment considering the effect of operating conditions and maintenance. The American Society of Mechanical Engineers (ASME)
    Academic chapter/article/Conference paper
  • De Ridder, Karin; Pape, Kristine; Johnsen, Roy; Westin, Steinar; Holmen, Turid Lingaas; Bjørngaard, Johan Håkon. (2012) Adolescent health is associated with high school dropout, independent of parental socioeconomic status: a prospective population study, The Young-HUNT 1 study (Norway). European Journal of Public Health
    Abstract

2011

  • Rommetveit, Tarjei; Johansen, Tonni Franke; Johnsen, Roy. (2011) Using a multi-layered transducer model to estimate the properties of paraffin wax deposited on steel. Ultrasonics
    Academic article
  • Von der Ohe, Christian Bertil; Johnsen, Roy; Espallargas, Nuria. (2011) A multi-degradation test rig for studying the synergy effects of tribocorrosion interacting with 4-point static and cyclic bending. Wear
    Academic article
  • Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2011) Microstructural characterization of pulsed plasma nitrided 316L stainless steel. Materials Science & Engineering: A
    Academic article
  • Hörnlund, Erik; Ersdal, Gerhard; Hinderaker, Rolf H.; Johnsen, Roy; Sharp, John M.. (2011) Material Issues in Ageing and Life Extension (OMAE2011-49363). The American Society of Mechanical Engineers (ASME)
    Academic chapter/article/Conference paper
  • Johnsen, Roy. (2011) Tribocorrosion in Marine Environments. Woodhead Publishing Limited
    Academic chapter/article/Conference paper

2010

  • Rommetveit, Tarjei; Johansen, Tonni Franke; Johnsen, Roy. (2010) A Combined Approach for High-Resolution Corrosion Monitoring and Temperature Compensation Using Ultrasound. IEEE Transactions on Instrumentation and Measurement
    Academic article
  • Laustad, Gro; Johnsen, Roy; Asbjørnsen, Ingvild; Bjurstrøm, Martin; Hjorth, C.G. (2010) Resistance Toward Hydrogen-Induced Stress Cracking of Hot Isostatically Pressed Duplex Stainles Steel under Cathodic Protection. Corrosion
    Academic article
  • Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Adhesion Properties of Polysiloxane Topcoats. Corrosion
    Academic article
  • Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Internal Stress in Polysiloxane Topcoats. Corrosion
    Academic article
  • Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Mechanical Properties of Polysiloxane Topcoats. Corrosion
    Academic article
  • von der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2010) Modeling the multi-degradation mechanisms of combined tribocorrosion interacting with static and cyclic loaded surfaces of passive metals exposed to seawater. Wear
    Academic article
  • Axelsen, Sten Bjarne; Sjaastad, A; Knudsen, Ole Øystein; Johnsen, Roy. (2010) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 3: A Case Study. Corrosion
    Academic article
  • Axelsen, Sten Bjarne; Knudsen, Ole Øystein; Johnsen, Roy. (2010) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 2: Framework Establishment. Corrosion
    Academic article

2009

  • Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd. (2009) Influence of hydrogen from cathodic protection on the fracture susceptibility of 25%Cr duplex stainless steel - Constant load SENT testing and FE-modelling using hydrogen influenced cohesive zone elements. Engineering Fracture Mechanics
    Academic article
  • Axelsen, Sten Bjarne; Knudsen, Ole Øystein; Johnsen, Roy. (2009) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System - Part 1: Risk Analysis Methodology. Corrosion
    Academic article
  • von der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2009) Hydraulic Cylinders for Offshore Splash Zone Operation: A Review of Piston Rod Failure Cases and Alternative Concepts.
    Academic chapter/article/Conference paper
  • Johnsen, Roy; Nyhus, Bård; Wästberg, Stig. (2009) Hydrogen Embrittlement of Stainless Steels Under Cathodic Protection in Seawater - Presentation of a New Test Method.
    Academic chapter/article/Conference paper

2008

  • Olden, Vigdis; Thaulow, Christian; Johnsen, Roy. (2008) Modelling of hydrogen diffusion and hydrogen induced cracking in supermartensitic and duplex stainless steels. Materials & design
    Academic literature review
  • Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd. (2008) Application of hydrogen influenced cohesive laws in the prediction of hydrogen induced stress cracking in 25%Cr duplex stainless steel. Engineering Fracture Mechanics
    Academic article

2007

  • Okstad, Trine; Rannestad, Øyvind; Johnsen, Roy; Nisancioglu, Kemal. (2007) Significance of hydrogen evolution during cathodic protection of carbon steel in Seawater. Corrosion
    Academic article
  • Johnsen, Roy. (2007) Experience with the use of copper alloys in seawater systems on the Norwegian Continental Shelf. Woodhead Publishing Limited
    Academic chapter/article/Conference paper
  • Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling. (2007) Cohesive Zone Modeling of hydrogen-induced stress cracking in 25% Cr duplex stainless steel. Scripta Materialia
    Academic article

2006

  • Johnsen, Roy; Gjerding-Smith, Knut; Lange, Hans Iver; Leinum, Bente; Gundersen, Gunnar; Isaksen, Bjørn. (2006) Wire fracture in locked coil cables. Bridge Structures - Assessment, Design and Construction
    Academic article

Tidsskriftspublikasjoner

  • Jemblie, Lise; Hagen, Anette Brocks; Hagen, Catalina Hoem Musinoi; Nyhus, Bård; Alvaro, Antonio; Wang, Dong. (2024) Safe pipelines for hydrogen transport. International Journal of Hydrogen Energy
    Academic article
  • Koren, Erik Aas; Yamabe, Junichiro; Lu, Xu; Hagen, Catalina Hoem Musinoi; Wang, Dong; Johnsen, Roy. (2024) Hydrogen diffusivity in X65 pipeline steel: Desorption and permeation studies. International Journal of Hydrogen Energy
    Academic article
  • Deconinck, Liesbet; Lu, Xu; Wang, Dong; Johnsen, Roy; Verbeken, Kim; Depover, Tom. (2024) Multiscale evaluation of hydrogen-assisted mechanical degradation in grade 2 titanium. Journal of Alloys and Compounds
    Academic article
  • Deconinck, Liesbet; Lu, Xu; Wang, Dong; Johnsen, Roy; Verbeken, Kim; Depover, Tom. (2024) Hydrogen enhanced localised plasticity of single grain α titanium verified by in-situ hydrogen microcantilever bending. International Journal of Hydrogen Energy
    Academic article
  • Lu, Xu; Johnsen, Roy. (2024) Hydrogen diffusion and uptake in nickel Alloy 625 under cathodic protection conditions. Heliyon
    Academic article
  • Vatn, Jørn; Johnsen, Roy. (2023) Kjernekraft. Det er fali’ det – eller?. Adressa/Midtnorskdebatt
    Reader opinion piece
  • Karimi, Shabnam; Taji, Iman; Palencsar, Simona; Dugstad, Arne; Hajilou, Tarlan; Barnoush, Afrooz. (2023) Evaluation of microstructural and environmental effects on the hydrogen uptake and desorption in high-strength carbon steels: A thermal desorption spectroscopy study. Corrosion Science
    Academic article
  • Karimi, Shabnam; Taji, Iman; Hajilou, Tarlan; Palencsar, Simona; Dugstad, Arne; Barnoush, Afrooz. (2023) Role of cementite morphology on corrosion layer formation of high-strength carbon steels in sweet and sour environments. Corrosion Science
    Academic article
  • Lu, Xu; Ma, Yan; Ma, Yuan; Wang, Dong; Gao, Lei; Song, Wenwen. (2023) Unravelling the effect of F phase on hydrogen-assisted intergranular cracking in nickel-based Alloy 725: Experimental and DFT study. Corrosion Science
    Academic article
  • Blücher, Daniel; Johnsen, Roy. (2023) Rustfritt stål er ikke alltid rustfritt. Teknisk Ukeblad
    Feature article
  • Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2023) Experimental comparison of gaseous and electrochemical hydrogen charging in X65 pipeline steel using the permeation technique. Corrosion Science
    Academic article
  • Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy. (2023) Investigating electrochemical charging conditions equivalent to hydrogen gas exposure of X65 pipeline steel. Materials and corrosion - Werkstoffe und Korrosion
    Academic article
  • Lu, Xu; Díaz, Andrés; Ma, Jun; Wang, Dong; He, Jianying; Zhang, Zhiliang. (2022) The effect of plastic deformation on hydrogen diffusion in nickel Alloy 625. Scripta Materialia
    Academic article
  • Wang, Dong; Hagen, Anette Brocks; Undrum Fathi, Pernille; Lin, Meichao; Johnsen, Roy; Lu, Xu. (2022) Investigation of hydrogen embrittlement behavior in X65 pipeline steel under different hydrogen charging conditions. Materials Science & Engineering: A
    Academic article
  • Lu, Xu; Ma, Yan; Peng, Ding; Johnsen, Roy; Wang, Dong. (2022) In situ nanomechanical characterization of hydrogen effects on nickel-based alloy 725 under different metallurgical conditions. Journal of Materials Science & Technology
    Academic article
  • Taji, Iman; Hajilou, Tarlan; Ebner, Anna Sophie; Scheiber, Daniel; Karimi, Shabnam; Plesiutschnig, Ernst. (2022) Hydrogen assisted intergranular cracking of alloy 725: The effect of boron and copper alloying. Corrosion Science
    Academic article
  • Hornus, Edgar; Vouilloz, Francisco; Long, Yu; Andersen, Kjetil; Krosness, Ola; King, Mike. (2022) Growth Kinetics of Calcareous Deposits on Thermally Sprayed Aluminum Coatings in Natural Seawater. Corrosion
    Academic article
  • Lu, Xu; Depover, Tom; Johnsen, Roy. (2022) Evaluation of hydrogen diffusion and trapping in nickel Alloy 625 by thermal desorption spectroscopy. International Journal of Hydrogen Energy
    Academic article
  • Lu, Xu; Wang, Dong; Wan, Di; Guo, Xiaofei; Johnsen, Roy. (2022) Reveal hydrogen behavior at grain boundaries in Fe-22Mn-0.6C TWIP steel via in-situ micropillar compression test. Acta Metallurgica Sinica (English Letters)
    Academic article
  • Skilbred, Ellen Synnøve; Palencsar, Simona; Dugstad, Arne; Johnsen, Roy. (2022) Hydrogen uptake during active CO2-H2S corrosion of carbon steel wires in simulated annulus fluid. Corrosion Science
    Academic article
  • Lu, Xu; Wang, Dong; Johnsen, Roy. (2022) Hydrogen diffusion and trapping in nickel-based alloy 625: An electrochemical permeation study. Electrochimica Acta
    Academic article
  • Karimi, Shabnam; Taji, Iman; Hajilou, Tarlan; Barnoush, Afrooz; Johnsen, Roy. (2022) Evaluation of the cementite morphology influence on the hydrogen induced crack nucleation and propagation path in carbon steels. International Journal of Hydrogen Energy
    Academic article
  • Maicas Esteve, Héctor; Taji, Iman; Wilms, Marc; Gonzalez-Garcia, Yaiza; Johnsen, Roy. (2022) Corrosion and Microstructural Investigation on Additively Manufactured 316L Stainless Steel: Experimental and Statistical Approach. Materials
    Academic article
  • Taji, Iman; Hajilou, Tarlan; Karimi, Shabnam; Schott, Florian; Plesiutschnig, Ernst; Barnoush, Afrooz. (2022) Role of grain boundaries in hydrogen embrittlement of alloy 725: single and bi-crystal microcantilever bending study. International Journal of Hydrogen Energy
    Academic article
  • Skilbred, Ellen Synnøve; Kappes, Mariano; Iannuzzi, Mariano; Johnsen, Roy. (2021) Hydrogen uptake and diffusivity in steel armor wires with different chemical composition, carbide distribution, grain size, and degree of deformation. Materials and corrosion - Werkstoffe und Korrosion
    Academic article
  • Wang, Dong; Hagen, Anette Brocks; Wan, Di; Lu, Xu; Johnsen, Roy. (2021) Probing hydrogen effect on nanomechanical properties of X65 pipeline steel using in-situ electrochemical nanoindentation. Materials Science & Engineering: A
    Academic article
  • Wang, Dong; Lu, Xu; Lin, Meichao; Wan, Di; Li, Zhiming; He, Jianying. (2021) Understanding the hydrogen effect on pop-in behavior of an equiatomic high-entropy alloy during in-situ nanoindentation. Journal of Materials Science & Technology
    Academic article
  • Wang, Dong; Lu, Xu; Wan, Di; Guo, Xiaofei; Johnsen, Roy. (2021) Effect of hydrogen on the embrittlement susceptibility of Fe-22Mn-0.6C TWIP steel revealed by in-situ tensile tests. Materials Science & Engineering: A
    Academic article
  • Torres Rodriguez, Cristian; Johnsen, Roy; Iannuzzi, Mariano. (2021) Crevice corrosion of solution annealed 25Cr duplex stainless steels: Effect of W on critical temperatures. Corrosion Science
    Academic article
  • Skilbred, Ellen Synnøve; Lootz, Signe Aarthun; Johnsen, Roy. (2020) Hydrogen Embrittlement Susceptibility of Steel Armor Wires for Flexible Pipes. International Corrosion Conference Series
    Academic article
  • Stenerud, Gaute; Hajilou, Tarlan; Olsen, Jim Stian; Taji, Iman; Barnoush, Afrooz; Johnsen, Roy. (2020) The Effect of Hydrogen on the Nanoindentation Behavior of Heat Treated 718 Alloy. Metals
    Academic article
  • Lervik, Adrian; Walmsley, John; Lodgaard, Lars; Marioara, Calin Daniel; Johnsen, Roy; Lunder, Otto. (2020) Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy. Metals
    Academic article
  • Torres Rodriguez, Cristian; Hazarabedian, Maria Sofia; Quadir, Zakaria; Johnsen, Roy; Iannuzzi, Mariano. (2020) The Role of Tungsten on the Phase Transformation Kinetics and its Correlation with the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels. Journal of the Electrochemical Society
    Academic article
  • Torres Rodriguez, Cristian; Iannuzzi, Mariano; Johnsen, Roy. (2020) Use of the Critical Acidification Model to Estimate the Influence of W in the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels. Metals
    Academic article
  • Kheradmand, Nousha; Rogne, Bjørn Rune Sørås; Dumoulin, Stephane; Deng, Yun; Johnsen, Roy; Barnoush, Afrooz. (2019) Small scale testing approach to reveal specific features of slip behavior in BCC metals. Acta Materialia
    Academic article
  • Johnsen, Roy; Gjelseng, Linn Cecilie; Heimsæter, Martin Arne; Jernberg, Anders; Qvale, Atle H. (2019) Influence of Manufacturing Process and Resulting Microstructure on HISC Susceptibility of 25Cr Duplex Stainless Steel Pipe. International Corrosion Conference Series
    Academic article
  • Wilson, Håvard; Johnsen, Roy; Torres Rodriguez, Cristian; Hesjevik, Sven Morten. (2019) Properties of TSA in natural seawater at ambient and elevated temperature. Materials and corrosion - Werkstoffe und Korrosion
    Academic article
  • Stefansson, Njall; Dunn, John; Strand, Einar; Johnsen, Roy; Heimsæter, Martin Arne. (2019) Performance of high strength UNS N08830 in hydrogen stress crack testing to simulate conditions arising from subsea cathodic protection. International Corrosion Conference Series
    Academic article
  • Ingdal, Mats; Johnsen, Roy; Harrington, David A.. (2019) The Akaike information criterion in weighted regression of immittance data. Electrochimica Acta
    Academic article
  • Torres Rodriguez, Cristian; Johnsen, Roy; Østvold, Hege Kokslien; Bernås, Mia; Iannuzzi, Mariano. (2019) Effect ofW on Phase Transformation Kinetics and its Correlation with Localized Corrosion Resistance for UNS S39274. International Corrosion Conference Series
    Academic article
  • Johnsen, Roy; Olavesen, Henrik Horten; Hossein Zavieh, Amin; Erlien, Tomas Laugsand. (2019) Effect of cathodic polarization on localized corrosion of 25Cr in seawater. International Corrosion Conference Series
    Academic article
  • Hajilou, Tarlan; Hope, Malin Sofie B.; Hossein Zavieh, Amin; Kheradmand, Nousha; Johnsen, Roy; Barnoush, Afrooz. (2018) In situ small-scale hydrogen embrittlement testing made easy: An electrolyte for preserving surface integrity at nano-scale during hydrogen charging. International Journal of Hydrogen Energy
    Academic article
  • Johnsen, Roy; Lange, Torstein; Stenerud, Gaute; Olsen, Jim Stian. (2018) Environmentally assisted degradation of spinodal copper alloy C72900. Corrosion Science
    Academic article
  • Ryen, Audun; Johnsen, Roy; Iannuzzi, Mariano; Årtun, Lars. (2018) Cathodic protection by distributed sacrificial anodes - Performance at elevated temperature and in mud. International Corrosion Conference Series
    Academic article
  • Wold, Kristian; Johnsen, Roy; Iannuzzi, Mariano; Årtun, Lars. (2018) Integrated cathodic protection (CP) sensor network development of the CP sensor. International Corrosion Conference Series
    Academic article
  • Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian. (2018) Hydrogen stress cracking and crack initiation in precipitation hardened Ni-alloys. Engineering Failure Analysis
    Academic article
  • Stenerud, Gaute; Wenner, Sigurd; Olsen, Jim Stian; Johnsen, Roy. (2018) Effect of different microstructural features on the hydrogen embrittlement susceptibility of alloy 718. International Journal of Hydrogen Energy
    Academic article
  • Husby, Hans; Wagstaff, Philip Haakon; Iannuzzi, Mariano; Johnsen, Roy; Kappes, Mariano A. (2018) Effect of Nickel on the Hydrogen Stress Cracking Resistance of Ferritic/Pearlitic Low Alloy Steels. Corrosion
    Academic article
  • Bernås, Mia; Westermann, Ida; Johnsen, Roy; Torres Rodriguez, Cristian; Jernberg, Anders; Qvale, Atle H. (2018) Effect of tungsten on the precipitation kinetics and localized corrosion resistance of super duplex stainless steels. International Corrosion Conference Series
    Academic article
  • Krogstad, Hedda Nordby; Johnsen, Roy; Coey, Michael. (2018) Effect of a uniform magnetic field on corrosion of Ni-Al bronze in 3.5wt% NaCl. Corrosion
    Academic article
  • Krogstad, Hedda Nordby; Johnsen, Roy; Coey, Michael. (2018) Effect of a time-dependent magnetic field on the corrosion of Ni-Al bronze. Corrosion
    Academic article
  • Torres Rodriguez, Cristian; Kappes, Mariano A; Johnsen, Roy; Iannuzzi, Mariano. (2018) Influence of tungsten on passivity breakdown and repassivation of 25CR super duplex stainless steel. International Corrosion Conference Series
    Academic article
  • Husby, Hans; Iannuzzi, Mariano; Johnsen, Roy; Mariano, Kappes; Barnoush, Afrooz. (2018) Effect of nickel on hydrogen permeation in ferritic/ pearlitic low alloy steels. International Journal of Hydrogen Energy
    Academic article
  • Iannuzzi, Mariano; Barnoush, Afrooz; Johnsen, Roy. (2017) Materials and corrosion trends in offshore and subsea oil and gas production. npj Materials Degradation
    Academic article
  • Bernås, Mia; Westermann, Ida; Johnsen, Roy; Lauritsen, Christian; Iannuzzi, Mariano. (2017) Effect of microstructure on the corrosion resistance of duplex stainless steels: Materials performance maps. International Corrosion Conference Series
    Academic article
  • Krogstad, Hedda Nordby; Johnsen, Roy. (2017) Corrosion properties of nickel-aluminium bronze in natural seawater?Effect of galvanic coupling to UNS S31603. Corrosion Science
    Academic article
  • Haugan, Eirik; Næss, Monika; Torres Rodriguez, Cristian; Johnsen, Roy; Iannuzzi, Mariano. (2017) Effect of tungsten on the pitting and crevice corrosion resistance of Type 25Cr super duplex stainless steels. Corrosion
    Academic article
  • Farhat, Hanan; Johnsen, Roy. (2017) Hydrogen sulfide tube failure in a seawater heat exchanger. Materials performance
    Academic article
  • Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian; He, Jianying; Barnoush, Afrooz. (2017) Effect of hydrogen on dislocation nucleation in alloy 718. International Journal of Hydrogen Energy
    Academic article
  • Quale, Geir; Iannuzzi, Mariano; Johnsen, Roy. (2017) Cathodic protection by distributed sacrificial anodes - A new cost-effective solution to prevent corrosion of subsea structures. International Corrosion Conference Series
    Academic article
  • Krogstad, Hedda Nordby; Skilbred, Ellen Synnøve; Johnsen, Roy. (2017) Corrosion of nickel aluminium bronze - Effect of alloying elements and pH. International Corrosion Conference Series
    Academic article
  • Krogstad, Hedda Nordby; Johnsen, Roy; Coey, M. (2017) Corrosion of nickel aluminium bronze - Effect of a uniform magnetic field. International Corrosion Conference Series
    Academic article
  • Johnsen, Roy; Nese, Ove. (2017) AA5083 and AA6082 exposed to seawater - Effect of potential on corrosion behaviour. International Corrosion Conference Series
    Academic article
  • Lange, Torstein; Bengtsson Blucher, Daniel; Venkataraman, Shankar; Jakobi, Dietinde; Asteman, Henrik; Johnsen, Roy. (2016) A new cast Ni-base alloy suitable for severe sour service. International Corrosion Conference Series
    Academic article
  • Næss, Monika; Johnsen, Roy; Haugan, Eirik Bjørge; Iannuzzi, Mariano. (2016) Effect of tungsten on pitting and crevice corrosion of type 25Cr super duplex stainless steel. International Corrosion Conference Series
    Academic article
  • Kheradmand, Nousha; Johnsen, Roy; Olsen, Jim Stian; Barnoush, Afrooz. (2016) Effect of Hydrogen on the hardness of different phases in super duplex stainless steel. International Journal of Hydrogen Energy
    Academic article
  • Næss, Monika E; Iannuzzi, Mariano; Johnsen, Roy. (2015) Use of electrochemical techniques to determine the effect of sigma (σ)-phase precipitation on a 25 wt% CR super duplex stainless steel. International Corrosion Conference Series
    Academic article
  • Holager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2015) Corrosion of thermally sprayed aluminum in flowing seawater. International Corrosion Conference Series
    Academic article
  • Castberg, Tore Støren; Johnsen, Roy; Berget, J. (2015) Corrosion and subsequent erosion of hardmetals: Dependence of WC grain size and distribution, and binder composition. Materials and corrosion - Werkstoffe und Korrosion
    Academic article
  • Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian. (2015) Susceptibility to Hydrogen Induced Stress Cracking of UNS N07718 and UNS N07725 under cathodic polarization. International Corrosion Conference Series
    Academic article
  • Olden, Vigdis; Saai, Afaf; Jemblie, Lise; Johnsen, Roy. (2014) FE simulation of hydrogen diffusion in duplex stainless steel. International Journal of Hydrogen Energy
    Academic article
  • Barnoush, Afrooz; Asgari, Masoud; Johnsen, Roy; Hoel, Rune. (2013) Hydrogen Effect on Nanomechanical Properties of the Nitrided Steel. Metallurgical and Materials Transactions A
    Academic article
  • Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2013) Small-scale structural and mechanical characterization of the nitrided layer in martensitic steel. Tribology International
    Academic article
  • Espallargas, Nuria; Johnsen, Roy; Torres, Christian Rodriguez; Igual Munoz, Anna. (2013) A new experimental technique for quantifying the galvanic coupling effects on stainless steel during tribocorrosion under equilibrium conditions. Wear
    Academic article
  • Asgari, Masoud; Johnsen, Roy; Barnoush, Afrooz. (2013) Nanomechanical characterization of the hydrogen effect on pulsed plasma nitrided super duplex stainless steel. International Journal of Hydrogen Energy
    Academic article
  • Baltzersen, Øystein; Johnsen, Roy; Martinussen, H; Nerbø, Ingar Stian. (2013) Using permanently installed ultrasound monitoring to maximize the lifetime of a pipeline. International Corrosion Conference Series
    Academic article
  • Asgari, Masoud; S. Azar, Amin; Barnoush, Afrooz; Johnsen, Roy. (2013) Orientation Relationships and Texture of the Iron-Nitride Phase Constituents in Pulsed Plasma Nitriding. Metallurgical and Materials Transactions A
    Academic article
  • Castberg, Tore Støren; Johnsen, Roy; Berget, John. (2013) Erosion of hardmetals: Dependence of WC grain size and distribution, and binder composition. Wear
    Academic article
  • Von der Ohe, Christian Bertil; Johnsen, Roy; Espallargas, Nuria. (2012) Multi-degradation behavior of austenitic and super duplex stainless steel - The effect of 4-point static and cyclic bending applied to a simulated seawater tribocorrosion system. Wear
    Academic article
  • Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2012) Nanomechanical evaluation of the protectiveness of nitrided layers against hydrogen embrittlement. Corrosion Science
    Academic article
  • Barnoush, Afrooz; Asgari, Masoud; Johnsen, Roy. (2012) Resolving the hydrogen effect on dislocation nucleation and mobility by electrochemical nanoindentation. Scripta Materialia
    Academic article
  • De Ridder, Karin; Pape, Kristine; Johnsen, Roy; Westin, Steinar; Holmen, Turid Lingaas; Bjørngaard, Johan Håkon. (2012) Adolescent health is associated with high school dropout, independent of parental socioeconomic status: a prospective population study, The Young-HUNT 1 study (Norway). European Journal of Public Health
    Abstract
  • Rommetveit, Tarjei; Johansen, Tonni Franke; Johnsen, Roy. (2011) Using a multi-layered transducer model to estimate the properties of paraffin wax deposited on steel. Ultrasonics
    Academic article
  • Von der Ohe, Christian Bertil; Johnsen, Roy; Espallargas, Nuria. (2011) A multi-degradation test rig for studying the synergy effects of tribocorrosion interacting with 4-point static and cyclic bending. Wear
    Academic article
  • Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2011) Microstructural characterization of pulsed plasma nitrided 316L stainless steel. Materials Science & Engineering: A
    Academic article
  • Rommetveit, Tarjei; Johansen, Tonni Franke; Johnsen, Roy. (2010) A Combined Approach for High-Resolution Corrosion Monitoring and Temperature Compensation Using Ultrasound. IEEE Transactions on Instrumentation and Measurement
    Academic article
  • Laustad, Gro; Johnsen, Roy; Asbjørnsen, Ingvild; Bjurstrøm, Martin; Hjorth, C.G. (2010) Resistance Toward Hydrogen-Induced Stress Cracking of Hot Isostatically Pressed Duplex Stainles Steel under Cathodic Protection. Corrosion
    Academic article
  • Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Adhesion Properties of Polysiloxane Topcoats. Corrosion
    Academic article
  • Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Internal Stress in Polysiloxane Topcoats. Corrosion
    Academic article
  • Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Mechanical Properties of Polysiloxane Topcoats. Corrosion
    Academic article
  • von der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2010) Modeling the multi-degradation mechanisms of combined tribocorrosion interacting with static and cyclic loaded surfaces of passive metals exposed to seawater. Wear
    Academic article
  • Axelsen, Sten Bjarne; Sjaastad, A; Knudsen, Ole Øystein; Johnsen, Roy. (2010) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 3: A Case Study. Corrosion
    Academic article
  • Axelsen, Sten Bjarne; Knudsen, Ole Øystein; Johnsen, Roy. (2010) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 2: Framework Establishment. Corrosion
    Academic article
  • Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd. (2009) Influence of hydrogen from cathodic protection on the fracture susceptibility of 25%Cr duplex stainless steel - Constant load SENT testing and FE-modelling using hydrogen influenced cohesive zone elements. Engineering Fracture Mechanics
    Academic article
  • Axelsen, Sten Bjarne; Knudsen, Ole Øystein; Johnsen, Roy. (2009) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System - Part 1: Risk Analysis Methodology. Corrosion
    Academic article
  • Olden, Vigdis; Thaulow, Christian; Johnsen, Roy. (2008) Modelling of hydrogen diffusion and hydrogen induced cracking in supermartensitic and duplex stainless steels. Materials & design
    Academic literature review
  • Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd. (2008) Application of hydrogen influenced cohesive laws in the prediction of hydrogen induced stress cracking in 25%Cr duplex stainless steel. Engineering Fracture Mechanics
    Academic article
  • Okstad, Trine; Rannestad, Øyvind; Johnsen, Roy; Nisancioglu, Kemal. (2007) Significance of hydrogen evolution during cathodic protection of carbon steel in Seawater. Corrosion
    Academic article
  • Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling. (2007) Cohesive Zone Modeling of hydrogen-induced stress cracking in 25% Cr duplex stainless steel. Scripta Materialia
    Academic article
  • Johnsen, Roy; Gjerding-Smith, Knut; Lange, Hans Iver; Leinum, Bente; Gundersen, Gunnar; Isaksen, Bjørn. (2006) Wire fracture in locked coil cables. Bridge Structures - Assessment, Design and Construction
    Academic article

Del av bok/rapport

  • Parow, Hanna; Johnsen, Roy; Skovhus, Torben Lund. (2021) MIC in the Fire Water Sprinkler System at St. Olavs Hospital, Trondheim, Norway. CRC Press
    Academic chapter/article/Conference paper
  • Perez Ramirez, Pedro Agustin; Johnsen, Roy; Utne, Ingrid Bouwer. (2012) Probabilistic condition assessment of aging equipment considering the effect of operating conditions and maintenance. The American Society of Mechanical Engineers (ASME)
    Academic chapter/article/Conference paper
  • Hörnlund, Erik; Ersdal, Gerhard; Hinderaker, Rolf H.; Johnsen, Roy; Sharp, John M.. (2011) Material Issues in Ageing and Life Extension (OMAE2011-49363). The American Society of Mechanical Engineers (ASME)
    Academic chapter/article/Conference paper
  • Johnsen, Roy. (2011) Tribocorrosion in Marine Environments. Woodhead Publishing Limited
    Academic chapter/article/Conference paper
  • von der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2009) Hydraulic Cylinders for Offshore Splash Zone Operation: A Review of Piston Rod Failure Cases and Alternative Concepts.
    Academic chapter/article/Conference paper
  • Johnsen, Roy; Nyhus, Bård; Wästberg, Stig. (2009) Hydrogen Embrittlement of Stainless Steels Under Cathodic Protection in Seawater - Presentation of a New Test Method.
    Academic chapter/article/Conference paper
  • Johnsen, Roy. (2007) Experience with the use of copper alloys in seawater systems on the Norwegian Continental Shelf. Woodhead Publishing Limited
    Academic chapter/article/Conference paper

Rapport

  • Sharma, Suraksha; Bjerk, Christoffer; Geiker, Mette Rica; Johnsen, Roy. (2024) Summary of inspections and investigations on post-tensioning components of Herøysund Bridge, Norway (2017-2023). NTNU, Department of Structural Engineering
    Report
  • Lu, Xu; Kattuputhur Soundararajan, Chandrahaasan; Wang, Dong; Johnsen, Roy. (2023) Failure investigation of Alloy 725 drive screw. Technical report
    Report
  • Bengtsson Blucher, Daniel; Knudsen, Ole Øystein; Brakstad, Odd Gunnar; Hakvåg, Sigrid; Johnsen, Roy. (2022) Korrosjon av Stål i Ferskvann. sintef as
    Report
  • Brataas, Arne; Mathiesen, Ragnvald; Grande, Tor; Roven, Hans Jørgen; Grepstad, Jostein; Echtermeyer, Andreas. (2013) Enabling technologies at NTNU; materials science and engineering. NTNU
    Report

PRODUKT

  • Olden, Vigdis; Johnsen, Roy; Jemblie, Lise; Hagen, Anette Brocks; Hagen, Catalina Hoem Musinoi; Zhang, Zhiliang. (2023) International Hydrogen and Materials Integrity Workshop 2023.
    Other product

Undervisning

Emner

  • MM8455 - Experimental and Modelling Approaches on Surface Science, Corrosion and Tribology
  • MM8484 - Applied Materials Seminar Series
  • TMM4560 - Engineering Design and Materials, Specialization Project
  • TMM4170 - Corrosion
  • TMT4255 - Corrosion and Corrosion Protection
  • TMM4205 - Tribology and Surface Technology
  • TMM4940 - Nanotechnology, Master's Thesis
  • TMM4960 - Engineering Design and Materials, Master's Thesis
  • TMM4550 - Nanotechnology, Specialization Project
  • TMM4540 - Industrial ICT Engineering Design and Materials, Specialization Project
  • TMM4100 - Materials Technology
  • MAST2100 - Materials technology
  • TMM4935 - Industrial ICT, Master's Thesis

Formidling

2024

  • Academic lecture
    Lu, Xu; Johnsen, Roy. (2024) Hydrogen embrittlement in Ni alloys: some insights. ECF conference 2024 2024-08-26 - 2024-08-30
  • Academic lecture
    Lu, Xu; Johnsen, Roy. (2024) Hydrogen embrittlement in Ni alloys: some insights. Hydrogenius Symposium 2024-09-12 - 2024-09-13
  • Academic lecture
    Jemblie, Lise; Alvaro, Antonio; Hagen, Catalina Hoem Musinoi; Hagen, Anette Brocks; Nyhus, Bård; Johnsen, Roy. (2024) Safe pipelines for hydrogen transport - results from the HyLINE project. Centre for Environment-friendly Research (FME) HYDROGENi H2Science , Trondheim 2024-06-18 - 2024-06-19
  • Academic lecture
    Hagen, Catalina Hoem Musinoi; Koren, Erik Halås; Knudsen, Ole Øystein; Hagen, Anette Brocks; Nyhus, Bård; Jemblie, Lise. (2024) Hydrogen embrittlement testing: electrochemical versus hydrogen gas charging. European Federation of Corrosion EUROCORR 2024 , Paris 2024-09-01 - 2024-09-05
  • Academic lecture
    Hagen, Catalina Hoem Musinoi; Koren, Erik Halås; Knudsen, Ole Øystein; Hagen, Anette Brocks; Nyhus, Bård; Jemblie, Lise. (2024) Exploring Electrochemical Charging: A Potential Substitute for Hydrogen Gas in Hydrogen Embrittlement Testing?. Centre for Environmental friendly Research (FME) HYDROGENi H2 Science , Oslo 2024-06-17 - 2024-06-18
  • Academic lecture
    Jemblie, Lise; Hagen, Catalina Hoem Musinoi; Nyhus, Bård; Alvaro, Antonio; Johnsen, Roy; Zhang, Zhiliang. (2024) Safe pipelines for hydrogen transport. VTT International seminar: Hydrogen & Materials 2024 , Espoo, Finland 2024-06-06 - 2024-06-07
  • Academic lecture
    Jemblie, Lise; Hagen, Catalina Hoem Musinoi; Johnsen, Roy; Nyhus, Bård; Alvaro, Antonio; Olden, Vigdis. (2024) Safe pipelines for Hydrogen Transport. Electric Power Research Institute - EPRI HydrogenEmbrittlement Workshop , University of Oxford 2024-06-23 - 2024-06-26
  • Lecture
    Endrös, Paula; Johnsen, Roy; Razavi, Nima; Lu, Xu. (2024) Hydriding behavior in Ti-6Al-4V manufactured with electron beam powder bed fusion (PBF-EB) . MSE 2024 Congress - Materials Science and Engineering 2024-09-24 - 2024-09-26
  • Lecture
    Endrös, Paula; Razavi, Nima; Johnsen, Roy; Lu, Xu. (2024) Hydrogen embrittlement of Ti-6Al-4V manufactured with electron beam powder bed fusion (PBF-EB) . European Conference on Fracture 2024 2024-08-26 - 2024-08-30
  • Academic lecture
    Deconinck, Liesbet; Ferreiros, Pedro A.; Que, Zaiqing; Johnsen, Roy; Lu, Xu. (2024) The role of martensite in hydrogen embrittlement of post-processed 316L stainless steel. ESIS European Conference on Fracture 2024 , Zagreb (Croatia) 2024-08-26 - 2024-08-30
  • Poster
    Deconinck, Liesbet; Ferreiros, Pedro A.; Que, Zaiqing; Johnsen, Roy; Lu, Xu. (2024) Hydrogen embrittlement of post-processed laser powder bed fused 316L stainless steel. Kyushu University Hydrogenius Symposium 2024 , Fukuoka (Japan) 2024-09-12 - 2024-09-13

2023

  • Academic lecture
    Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2023) Hydrogen diffusion in X65 pipeline steels. SINTEF/NTNU/Kyushu University SNEAC - Environmental assisted cracking workshop , Trondheim 2023-06-06 - 2023-06-08
  • Academic lecture
    Johnsen, Roy; Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Lu, Xu; Wang, Dong. (2023) Main take aways from the HYLINE project WP1 - Relationship between gaseous and electrochemical hydrogen charging of X65 pipeline steel using the permeation technique. SINTEF INDUSTRI og NTNU SNEAC II - NTNU/SINTEF , Trondheim 2023-06-07 - 2023-06-08
  • Academic lecture
    Lu, Xu; Ma, Yan; Ma, Yuan; Johnsen, Roy. (2023) H-assisted failure in nickel alloys and possible mitigation approaches . 19th Asian Pacific Corrosion Control Conference 2023-11-17 - 2023-11-18
  • Academic lecture
    Sharma, Suraksha; Bjerk, Christoffer; Geiker, Mette Rica; Hornbostel, Karla; Osmolska, Magdalena Jadwiga; Danner, Tobias. (2023) Inspections and Investigations on Herøysund Bridge, 2023. UiT HERØY FoU: 2023 PLENARY MEETING , Narvik 2023-12-05 - 2023-12-06
  • Academic lecture
    Olden, Vigdis; Alvaro, Antonio; Nyhus, Bård; Hagen, Anette Brocks; Johnsen, Roy; Di, Wan. (2023) Hydrogen embrittlement in subsea pipelines - From natural gas to hydrogen gas transport. Engineering Conferences International International Hydrogen Conference 2023 , Park City, Utah, USA 2023-09-17 - 2023-09-21

2022

  • Academic lecture
    Alvaro, Antonio; Myhre, Aleksander Omholt; Olden, Vigdis; Hagen, Anette Brocks; Wang, Dong; Nyhus, Bård. (2022) Mechanical performance of subsea pipeline steels for hydrogen transport application. OCAS International Conference on Metals and Hydrogen , Ghent 2022-10-11 - 2022-10-13
  • Academic lecture
    Johnsen, Roy; Djupvik, Veronika; Hartung, Cathrine; Qvale, Atle Helge; Westermann, Ida. (2022) The Susceptibility of Spheroidal Graphite Cast Iron to Hydrogen Induced Stress Cracking. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-06 - 2022-03-10
  • Academic lecture
    Nyhus, Bård; Alvaro, Antonio; Myhre, Aleksander Omholt; Hagen, Anette Brocks; Wang, Dong; Koren, Erik Aas. (2022) Hydrogen-materials research on the influence of pressurized H2 gas on pipeline steel - Recent results from the HyLINE project. Norsk Petroleumsforening Subsea Pipelines & Cables , Trondheim 2022-10-11 - 2022-10-12
  • Academic lecture
    Lu, Xu; Johnsen, Roy. (2022) Hydrogen diffusion and uptake in nickel Alloy 625 . Eurocorr Conference , Berlin 2022-08-28 - 2022-09-01
  • Academic lecture
    Lu, Xu; Johnsen, Roy. (2022) Hydrogen diffusion and uptake in nickel alloy 625. Nasjonal konferanse for materialteknologi , Oslo 2022-06-01 - 2022-06-02
  • Academic lecture
    Johnsen, Roy. (2022) Hydrogen uptake and embrittlement of X65 pipeline steel. Qatar Environment and Energy Research Institute (QEERI) Material Science day at Qatar Environment and Energy Research Institute (QEERI) , Doha, Qatar 2022-09-15 - 2022-09-15
  • Lecture
    Johnsen, Roy; Salasi, Mobin; Iannizzi, Mariano; Andersen, Kjetil; Krosness, Ola. (2022) Calcareous deposition on thermally sprayed aluminum surfaces. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-05 - 2022-03-10
  • Lecture
    Johnsen, Roy; Torres, Cristian; Skar, Jan-Ivar; Duparc, Marion; Hesjevik, Sven Morten. (2022) Determination of oxygen limits for corrosion resistant alloys (CRAs) in oil & gas produced water based on electrochemical test methods Part 1: Crevice corrosion and repassivation potentials without oxygen. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-06 - 2022-03-10
  • Lecture
    Johnsen, Roy; Duparc, Marion; Skar, Jan-Ivar; Saxegård, Tov Eivind. (2022) Determination of Oxygen Limits for Corrosion Resistant Alloys (CRAs) in Oil & Gas Produced Water Based on Electrochemical Test Methods – Part 2. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-05 - 2022-03-10
  • Academic lecture
    Lu, Xu; Johnsen, Roy. (2022) H-assisted failure in nickel alloys and possible mitigation approach. Swerim 4th Sweden hydrogen seminar 2022-10-27 - 2022-10-27
  • Academic lecture
    Lu, Xu; Johnsen, Roy. (2022) Hydrogen diffusion and trapping in nickel Alloys 625 and 725. NTNU HEiNS symposium , Trondheim 2022-12-05 - 2022-12-06
  • Academic lecture
    Olden, Vigdis; Vinogradov, Alexei; Johnsen, Roy; Zhang, Zhiliang; Alvaro, Antonio; Hagen, Catalina Hoem Musinoi. (2022) Hydrogen embrittlement resistance of X65 pipeline steels - Results from the HyLINE project. HYDROGENIUS, I2CNER, HYDROMATE AND SINTEF HYDROGEN-MATERIALS INTERACTIONS - HYDROGENIUS, I2CNER, HYDROMATE AND SINTEF JOINT RESEARCH SYMPOSIUM 2022 , Fukuoka, Kyushu Universitet 2022-01-27 - 2022-01-28
  • Lecture
    Olden, Vigdis; Vinogradov, Alexei; Johnsen, Roy; Zhang, Zhiliang; Alvaro, Antonio; Hagen, Catalina Hoem Musinoi. (2022) Hydrogen embrittlement resistance of X65 pipeline steel – recent results from the HyLINE project. Norsk Forening for vedlikehold Robust materialvalg i energisektoren , Quality Hotel Olavsgaard, Skjetten 2022-04-04 - 2022-04-05
  • Academic lecture
    Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2022) Experimental comparison of gaseous and electrochemical hydrogen charging in a X65 pipeline steel using the permeation technique​. European Federation of Corrosion EUROCORR2022 , Berlin, Tyskland 2022-08-28 - 2022-09-01
  • Academic lecture
    Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2022) Correlating electrochemical and gaseous hydrogen charging of a X65 pipeline steel by the permeation technique. European Structural Integrity Society ECF23, European Conference on Fracture 2022 , Madeira, Portugal 2022-06-27 - 2022-07-01

2021

  • Academic lecture
    Lu, Xu; Johnsen, Roy. (2021) Effect of temperature on hydrogen uptake in nickel alloy 625. Academic Seminar on the M-HEAT project 2021-10-12 - 2021-10-12
  • Academic lecture
    Lu, Xu; Johnsen, Roy. (2021) Study on hydrogen trapping and diffusion in nickel alloys. NTNU Academic Seminar on the M-HEAT project , NTNU 2021-06-15 - 2021-06-15
  • Academic lecture
    Lu, Xu; Johnsen, Roy. (2021) Evaluation of hydrogen diffusion behavior in nickel alloy 625. NTNU Academic Seminar on the M-HEAT project , NTNU 2021-03-23 - 2021-03-23
  • Lecture
    Johnsen, Roy; Eriksen, Kristian; Hauger, Stian. (2021) Welding of CRA with insufficient purging gas Impact on mechanical properties and corrosion resistance. NACE International/AMMP NACE Corrosion 2021 , Salt Lake City, USA 2021-04-19 - 2022-01-30
  • Academic lecture
    Hagen, Catalina Hoem Musinoi; Knudsen, Ole Øystein; Johnsen, Roy; Pfleging, Wilhelm. (2021) Oxidation of coated steel during exposure to humid air and effects on cathodic disbonding. EUROCORR 2021 2021-09-20 - 2021-09-24

2017

  • Academic lecture
    Johnsen, Roy. (2017) Hydrogen Induced Stress Cracking of Stainless Steel in Seawater – what do we know and what is still unknown?. European Federation of Corrosion EUROCORR 2017 , Praha 2017-07-03 - 2017-07-07

2016

  • Academic lecture
    Bernås, Mia; Westermann, Ida; Johnsen, Roy; Iannuzzi, Mariano. (2016) Microstructural evolution during isothermal heat treatment of a W-rich super duplex stainless steel. Norsk Materialteknisk Selskap/Norsk Metallografisk Forening Nasjonal Konferanse for Materialteknologi , Trondheim 2016-08-24 - 2016-08-25
  • Academic lecture
    Johnsen, Roy; Stenerud, Gaute; Barnoush, Afrooz; Olsen, Jim Stian. (2016) In Situ Electrochemical Nanoindentation of Alloy 718. European Federation of Corrosion EUROCORR 2016 , Montpellier 2016-09-11 - 2016-09-15
  • Academic lecture
    Johnsen, Roy; Lange, Torstein; Olsen, Jim Stian. (2016) Susceptibility to hydrogen embrittlement for C72900 exposed to H2S environment and under cathodic polarization in simulated seawater. European Federation of Corrosion EUROCORR 2016 , Montpellier 2016-09-11 - 2016-09-15
  • Academic lecture
    Venkataraman, Shankar; Bengtsson Blucher, Daniel; Jakobi, Dietinde; Asteman, Dr. Henrik; Johnsen, Roy; Lange, Torstein. (2016) A New Cast Ni-Base Alloy Suitable for Severe Sour Service. Nace International NACE International Corrosion 2016 Conference & Expo , Vancouver 2016-03-06 - 2016-03-10
  • Academic lecture
    Johnsen, Roy. (2016) Hydrogen Induced Stress Cracking of Duplex Stainless Steel under Cathodic Protection in Seawater – Historical overview and Lessons Learned. ACerS, AIST, ASM International, TMS, NACE International Material Science & TEchnology 2016 , Salt Lake City 2016-10-23 - 2016-10-27
  • Academic lecture
    Bengtsson Blucher, Daniel; Lange, Torstein; Venkataraman, Shankar; Asteman, Henrik; Jakobi, Dietlinde; Johnsen, Roy. (2016) A new centrifugally cast austenitic Ni-base alloy suitable for severe sour service heavy wall thickness piping application. EUROCORR 2016 2016-09-11 - 2016-09-15
  • Academic lecture
    Johnsen, Roy; husby, hans; Barnoush, Afrooz; Iannuzzi, Mariano. (2016) Effect of nickel in solid solution on hydrogen transport kinetics in low alloy steels. European Federation of Corrosion EUROCORR/16 , Montpellier 2016-09-11 - 2016-09-15
  • Academic lecture
    Olden, Vigdis; Johnsen, Roy; Zhang, Zhiliang. (2016) Hydrogen induced stress cracking (HISC) . SINTEF og NTNU SINTEF and NTNU's Environmental Assisted Cracking workshop - SNEAC , Trondheim 2016-06-08 - 2016-06-10
  • Academic lecture
    Johnsen, Roy; Iannuzzi, Mariano; Haugan, Eirik; Næss, Monika E. (2016) Effect of Tungsten on Pitting and Crevice Corrosion of type 25Cr Super Duplex Stainless Steel. NACE International NACE International Corrosion 2016 Conference & Expo , Vancouver 2016-03-06 - 2016-03-10
  • Academic lecture
    Krogstad, Hedda Nordby; Johnsen, Roy. (2016) The effect of a Magnetic Field on the Galvanic corrosion of NiAlBronze in Natural Seawater. NACE International NACE International Corrosion 2016 Conference & Expo , Vancouver 2016-03-06 - 2016-06-10
  • Lecture
    Johnsen, Roy; Iannuzzi, Mariano. (2016) Distributed Sacrificial Anode (DSA) – a new cost effective solution for corrosion protection of structures in seawater . Norsk Korrosjonsteknisk Forening, Stavanger avdeling Materialdagen , Stavanger 2016-06-02 - 2016-06-03

2015

  • Academic lecture
    Holager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2015) Corrosion of Thermally Sprayed Aluminum in Flowing Seawater. NACE International NACE Corrosion 2015 , Dallas, Texas 2015-03-15 - 2015-03-19
  • Lecture
    Kheradmand, Nousha; Johnsen, Roy; Barnoush, Afrooz. (2015) Hydrogen Embrittlement in Advanced Materials for Oil and Gas Industry: A Nanomechanical Approach. TMS 2015, 144th Annual Meeting and Exhibition 2015-03-15 - 2015-03-19
  • Lecture
    Kheradmand, Nousha; Hajilou, Tarlan; Deng, Yun; Johnsen, Roy; Barnoush, Afrooz. (2015) In situ electrochemical-micro-compression test: An investigation of dislocation-grain boundary interaction in presence of hydrogen. TMS 2015, 144th Annual Meeting and Exhibition 2015-03-15 - 2015-03-19
  • Academic lecture
    Iannuzzi, Mariano; Johnsen, Roy; Næss, Monika E. (2015) Use of electrochemical techniques to determine the degree of σ-phase precipitation in Type 25Cr SDSS. NACE International CORROSION/15 , Dallas 2015-03-16 - 2015-03-19
  • Academic lecture
    Iannuzzi, Mariano; Johnsen, Roy; Næss, Monika E. (2015) Use of electrochemical techniques to determine localized corrosion resistance of 25-wt% Cr Super Duplex Stainless Steels. Norwegian Corrosion Society 16th Nordic Corrosion Congress , Stavanger 2015-05-20 - 2015-05-22
  • Academic lecture
    Johnsen, Roy. (2015) Corrosion and hydrogen embrittlement in production systems – effect on process safety. College of North Atlantic Qatar Qatar Process Safety Symposium “Successfully Managing Changes for a safer future , Doha 2015-03-30 - 2015-03-31
  • Academic lecture
    Johnsen, Roy. (2015) Corrosion Challenges for the oil and gas industry in the State of Qatar. TMS TMS Middle East – Mediterranean Materials Congress and Energy and Infrastructure Systems (MEMA 2015). , Doha 2015-01-11 - 2015-01-14

2014

  • Academic lecture
    Holager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2014) Corrosion of Thermally Sprayed Aluminium in Flowing Seawater. European Federation of Chemical Engineering 10th European Symposium on Electrochemical Engineering , Cagliari 2014-09-28 - 2014-10-02
  • Academic lecture
    Olden, Vigdis; Saai, Afaf; Jemblie, Lise; Johnsen, Roy. (2014) A finite element study of hydrogen diffusion in duplex stainless steel. Lode Duprez, Department Manager Metallurgy at OCAS, Zelzate Steel & Hydrogen Conference 2014 , Gent 2014-05-05 - 2014-05-07
  • Academic lecture
    Johnsen, Roy. (2014) Hydrogen embrittlement of corrosion resistant alloys in oil/gas environment. Texas A&M Qatar Oryx GTL Excellence Series in Chemical Engineering , Doha 2014-02-18 - 2014-02-18
  • Academic lecture
    Andersen, Kjetil; Johnsen, Roy; Olsen, Jim Stian. (2014) Effect of grain size on HISC resistance in 25% Cr super duplex stainless steels. ESIS EFC20 , TRONDHEIM 2014-06-30 - 2014-07-04
  • Academic lecture
    Wesmann, Johan Andre; Johnsen, Roy; Espallargas, Nuria; Herland, j; Twist, Dag; Araki, H. (2014) Investigation of oxide formation on sliding interfaces of WC-CoCr in relation to friction and wear. Foredrag - proceedings 2014-05-21 - 2014-05-23

2013

  • Academic lecture
    Wesmann, Johan Andre; Herland, j; Twist, Dag; Johnsen, Roy; Espallargas, Nuria. (2013) Influence of environmental conditions on friction of WC-CoCr coatings. World Tribology Conference 2013 2013-09-08 - 2013-09-13
  • Academic lecture
    Wesmann, Johan Andre; Twist, Dag; Johnsen, Roy; Espallargas, Nuria. (2013) Friction and wear of coatings for subsea valves. International Thermal Spray Conference 2013 2013-05-13 - 2013-05-15
  • Academic lecture
    Wesmann, Johan Andre; Herland, j; Twist, Dag; Johnsen, Roy; Espallargas, Nuria. (2013) FRICTION EVOLUTION OF WC-CoCr THERMALLY SPRAYED COATINGS DURING DRY SLIDING IN DIFFERENT ENVIRONMENTS. International Tribology Symposium of IFToMM 2013-03-19 - 2013-03-21
  • Academic lecture
    Barnoush, Afrooz; Zamanzade, Mohammad; Asgari, Masoud; Johnsen, Roy; Vehoff, Horst. (2013) Hydrogen embrittlement revisited by novel nanomechanical approach. German physic society (DPG) DPG Spring Meeting of the Condensed Matter Section , Regensburg 2013-03-10 - 2013-03-15
  • Academic lecture
    Lange, Hans Iver; Johnsen, Roy; Gundersen, Gunnar. (2013) Sensitivity for fracture from defects in wires of bridge suspension cables. The 8th International cable supported bridge operators' conference, Edinburgh, Scotland 2013-06-03 - 2013-06-05

2012

  • Academic lecture
    Espallargas, Nuria; von der Ohe, Christian B.; Johnsen, Roy. (2012) Effect of fatigue on tribocorrosion of passive materials used in offshore drilling applications – new test rig combining cyclic/static bending and tribocorrosion. foredrag 2012-04-19 - 2012-04-20
  • Academic lecture
    Johnsen, Roy. (2012) Hydrogen embrittlement of carbon steel and stainless steel. Qatar University and Texas A&M Materials and Science Engineering Symposium 2012 , Doha 2012-02-28 - 2012-02-28
  • Popular scientific lecture
    Johnsen, Roy. (2012) Corrosion and corrosion fatigue properties of aluminium components – Focus on oil & gas. Qatar University Aluminium Workshop , Doha 2012-05-12 - 2012-05-12
  • Academic lecture
    Perez Ramirez, Pedro Agustin; Johnsen, Roy; Utne, Ingrid Bouwer. (2012) Probabilistic condition assessment of aging equipment considering the effect of operating conditions and maintenance. 31st International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2012) , Rio de Janeiro 2012-07-01 - 2012-07-06

2011

  • Academic lecture
    Mubarok, Fahmi; Puranen, Jouni; Vuoristo, Petri; Johnsen, Roy; Espallargas, Nuria. (2011) Effect of suspension characteristics on microstructure of suspension plasma sprayed SiC submicron coatings. DVS – German Welding Society, ASM International International Thermal Spray Conference 2011 , Hamburg 2011-09-27 - 2011-09-29
  • Academic lecture
    Bjørnsdotter, Marte; Holme, Caroline; Johnsen, Roy; Nisancioglu, Kemal. (2011) A simple approach for measuring slow rates of hydrogen entrainment and diffusion in metals. The Electrochemical Society 220th ECS Meeting , Boston 2011-10-09 - 2011-10-14
  • Academic lecture
    Bjørnsdotter, Marte; Johnsen, Roy; Nisancioglu, Kemal. (2011) A simple method for measuring hydrogen entrainment and diffusion in stainless steel. European Federation of Corrosion Eurocorr (The European Corrosion Congress) 2011 , Stockholm 2011-09-04 - 2011-09-08
  • Academic lecture
    Bjørnsdotter, Marte; Holme, Caroline; Johnsen, Roy; Nisancioglu, Kemal. (2011) A simple electrochemical engineering approach for measuring very slow rates of hydrogen entrainment and diffusion in metals. The european federation of chemical engineering 9th ESEE (European Symposium on Electrochemical Engineering) 2011 , Chania, Kreta 2011-06-19 - 2011-06-23
  • Academic lecture
    Johnsen, Roy. (2011) Replacement of "Hard Chrome" with HVOF on piston rods for offshore hydraulic sylinders. Svetskommissionen Nordic Conference on Thermal Spraying , Trollhättan 2011-04-13 - 2011-04-14
  • Academic lecture
    Johnsen, Roy; Nyhus, B.; Kongsten, O.E.. (2011) Susceptibility of hydrogen induced stress cracking of duplex stainless steel at elevated temperature. NACE Corrosion 2011 , Houston 2011-03-13 - 2011-03-17
  • Academic lecture
    Johnsen, Roy; Espallargas, Nuria; von der Ohe, Christian B.. (2011) The effect of cyclic and static tensile stresses on the tribocorrosion behavior of austenitic and duplex stainless steels in marine environment. NACE Corrosion 2011 , Houston 2011-03-13 - 2011-03-17
  • Poster
    Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2011) Effect of In-situ Hydrogen Charging on the Pulsed Plasma Nitriding Layer in Stainless steel. Engineering Conferences International (ECI 2011) Nanomechanical Testing in Materials Research and Development , Lanzarote, Canary Islands 2011-10-09 - 2011-10-14

2010

  • Academic lecture
    Johnsen, Roy; Nisancioglu, Kemal. (2010) INFLUENCE OF TEMPERATURE AND HYDROSTATIC PRESSURE ON HYDROGEN DIFFUSIVITY AND PERMEABILITY IN 13%Cr SUPER MARTENSITIC STAINLESS STEEL UNDER CATHODIC PROTECTION. NACE NACE Corrosion 2010 , San Antonio, Texas 2010-03-13 - 2010-03-17
  • Popular scientific lecture
    Johnsen, Roy. (2010) Thirty Years Experience with the use of stainless steels on the Norwegian Continental Shelf. Swerea/KIMAB 21st Seminar on Stainless Steel May 19th 2010 , Stockholm 2010-05-19 - 2010-05-19
  • Popular scientific lecture
    Johnsen, Roy. (2010) Corrosion related problems on the Norwegian Continental Shelf - Topside and subsea. Petronas, Pertrad and Intsok Workshop on Corrosion Management , Kuala Lumpur 2010-01-26 - 2010-01-27
  • Academic lecture
    Skjellerudsveen, Magnus; Akselsen, Odd Magne; Olden, Vigdis; Johnsen, Roy. (2010) Effect of microstructure and temperature on hydrogen diffusion and trapping in X70 pipeline steel and its weldments. Dechema EuroCorr 2010 , Moskva 2010-09-13 - 2010-09-17
  • Academic lecture
    Smirnova, Anna; Johnsen, Roy; Nisancioglu, Kemal. (2010) Effect of tensile stress on hydrogen permeation in 13% Cr super martensitic stainless steel. Dechema EuroCorr 2010 , Moskva 2010-09-13 - 2010-09-17
  • Popular scientific lecture
    Johnsen, Roy. (2010) Kan termisk sprøyting erstatte ”forkromming” på komponenter offshore?. Korrosjonsteknisk Forening, Bergen / Overflateteknikk Overflate 2010 , Bergen 2010-11-10 - 2010-11-11
  • Popular scientific lecture
    Johnsen, Roy. (2010) Improved corrosion protection of topside structures by thermal spraying. Petronas, Pertrad and Intsok Workshop on Corrosion Management , Kuala Lumpur 2010-01-26 - 2010-01-27

2009

  • Academic lecture
    Bjørgum, Astrid Jørgine; Knudsen, Ole Øystein; Johnsen, Roy. (2009) Zinc rich primers - Effect of zinc loading. European Ferderation of Corrosion EUROCORR 2009 , Nice 2009-09-07 - 2009-09-10
  • Academic lecture
    Smirnova, Anna; Johnsen, Roy; Nisancioglu, Kemal. (2009) The influence of calcareous deposit on hydrogen uptake in 13% Cr super martensittic stainles steel under cathodic protection. European Federation of Corrosion EUROCORR 2009 , Nice 2009-09-07 - 2009-09-10
  • Academic lecture
    Johnsen, Roy; Stangeland, Helga Wiig. (2009) Cathodic Protection in Cold Seawater - current density requirements. NACE International Corrosion 2009 , Atlanta, Georgia 2009-03-22 - 2009-03-26
  • Academic lecture
    von der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2009) Premature failure of riser tensioner piston rods exposed to offshore splash zone operation – status and review of critical multi-degradation factors. NACE International Corrosion 2009 , Atlanta 2009-03-22 - 2009-03-26
  • Academic lecture
    Rommetveit, Tarjei; Johnsen, Roy; Johansen, Tonni Franke; Baltzersen, Øystein. (2009) High resolution ultrasound thickness measurements through polyester coating and real-time process control. NACE International Corrosion 2009 , Atlanta 2009-03-22 - 2009-03-26
  • Academic lecture
    Johnsen, Roy; Vingsand, Håvard. (2009) Corrosion properties of UNS S32750, UNS N06022 and UNS N10276 in seawater. NACE International Corrosion 2009 , Atlanta 2009-03-22 - 2009-03-26
  • Academic lecture
    Johnsen, Roy. (2009) Hydraulic piston rods for hash environment - Can 25% Cr super duplex stainless steel be the preffered material?. ATI Wah Chang Corrosion Solution 2009 7th International Conference , Park City - Utah 2009-09-20 - 2010-09-24
  • Academic lecture
    Espallargas, Nuria; Johnsen, Roy; von der Ohe, Christian B.. (2009) Tribocorrosion properties of super duplex stainless steel in 3.4% NaCl and H2SO4 0.5M solution. European Federation of Corrosion EUROCORR 2009 , Nice 2009-09-07 - 2009-09-10
  • Academic lecture
    Smirnova, Anna; Johnsen, Roy; Nisancioglu, Kemal. (2009) Influence of calcareous deposits on hydrogen uptake in 13% Cr super martensitic stainless steel under cathodic protection. EuroCorr2009 2009-09-06 - 2009-09-10
  • Academic lecture
    Johnsen, Roy; Nyhus, Bård; Kongstein, Ole Edvard. (2009) Effect of temperature on Hydrogen Induced Stress Cracking (HISC) of UNS S32750 under cathodic protection in seawater. European Federation of Corrosion EUROCORR 2009 , NICE 2009-09-07 - 2009-09-10
  • Academic lecture
    Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2009) Protective Coatings Offshore: Introducing a risk based maintenance management system. NACE International Corrosion 2009 , Atlanta 2009-03-22 - 2009-03-26
  • Poster
    Smirnova, Anna; Johnsen, Roy. (2009) New equipment for studying hydrogen diffusion in metals under varying temperature, stress/strain and hydrostatic pressure. EuroCorr2009 2009-09-06 - 2009-09-10

2008

  • Academic lecture
    Johnsen, Roy. (2008) HISC testing of stainless components in seawater under cathodic protection. National Physical laboratory FESI-NPL Workshop "How best to qualify a material for resistance to hydrogen assisted cracking? , Teddington 2008-02-12 - 2008-02-12
  • Academic lecture
    Rommetveit, Tarjei; Johnsen, Roy; Baltzersen, Øystein. (2008) Using ultrasound measurements for real-time process control of pipelines and process equipment subjected to corrosion and/or erosion. NACE International Corrosion 2008 , New Orleans 2008-03-16 - 2008-03-20
  • Academic lecture
    Okstad, Trine; Rannestad, Øyvind; Johnsen, Roy; Nisancioglu, Kemal. (2008) Significance of hydrogen evolution in cathodic protection of steel in seawater. Izmir University XI. International Corrosion Symposium (KORSEM08) , Izmir 2008-10-22 - 2008-10-25
  • Academic lecture
    Johnsen, Roy. (2008) Hydrogensprøhet for materialer i sjøvann - hva vet vi?. Norsk Forening for Vedlikehold Oppshore Prosessanlegg og Rørledninger , Bergen 2008-10-21 - 2008-10-22
  • Academic lecture
    Olden, Vigdis; Thaulow, Christian; Johnsen, Roy. (2008) FE modeling of hydrogen induced stress cracking in 25% Cr duplex stainless steel. 2008 International Hydrogen Conference , Jackson Lake Lodge, Grand Teton National Park, Wyoming 2008-09-07 - 2008-09-10
  • Academic lecture
    Johnsen, Roy; Nyhus, Bård; Wästberg, Stig. (2008) HISC testing of stainless steels under cathodic protection in seawater. Aurocorr 2008 , Edinburgh 2008-09-07 - 2008-09-11
  • Academic lecture
    Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd; Nyhus, Bård. (2008) Influence of hydrogen from CP on the fracture susceptibility of 25% Cr duplex stainless steel - FE modeling of constant load testing using hydrogen influenced cohesive zone elements. ISOPE 2008 , Vancouver 2008-07-06 - 2008-07-11
  • Academic lecture
    Johnsen, Roy; Vingsand, Håvard. (2008) Comparion of corrosion properties of UNS S32750, UNS N06022 and UNS N10276 in seawater. Eurocorr 2008 , Edinburgh 2008-09-07 - 2008-09-11
  • Academic lecture
    Espallargas, Nuria; Johnsen, Roy; Lunde, Lars; Berget, Jon. (2008) Coatings for use in Telescopic Joint used in Workover riser systems. Eurocorr 2008 , Edinburgh 2008-09-07 - 2008-09-11
  • Academic lecture
    Axelsen, Sten Bjarne; Røsseland, T.; Johnsen, Roy; Knudsen, Ole Øystein. (2008) Topcoat flaking - A mechanism study. NACE Corrosion 2008 , New Orleans 2008-03-16 - 2008-03-20

2007

  • Academic lecture
    Johnsen, Roy. (2007) Cathodic protection in natural seawater - current practice and effect on probability of hydrogen induced stress cracking. European Federation of Corrosion Event No. 289 Konferanse , Freiburg im Breisgau 2007-09-09 - 2007-09-13
  • Academic lecture
    Johnsen, Roy; Lauvstad, Gro Ø.; Asbjørnsen, Ingvild; Bjurstrøm, Martin; Hjort, Carl Gustav. (2007) The resistance towards hydrogen induced stress cracking (HISC) of hot isostatically pressed (HIP) duplex stainless steels under cathodic protection. European Federation of Corrosion Event No. 289 Eurocorr 2007 , Freiburg im Breisgau 2007-09-09 - 2009-09-13
  • Academic lecture
    Johnsen, Roy; Bjørgum, Astrid Jørgine; Knudsen, Ole Øystein; Kvernbråten, Ann-Karin. (2007) Bare steel maintenance offshore - effect of different mechanical pre-treatment methods. European Federation of Corrosion Event No. 289 Eurocorr 2007 , Freiburg im Breisgau 2007-09-09 - 2007-09-13
  • Academic lecture
    Smirnova, Anna; Johnsen, Roy. (2007) Hydrogen Permeation in Super Martensitic and Duplex Stainless Steels under Cathodic Charging and Exposed to Artificial Seawater and 3.5% NaCl Solution. EuroCorr 2007 , Freiburg 2007-09-09 - 2007-09-13
  • Academic lecture
    Johnsen, Roy; Okstad, Trine; Nicansioglu, Kemal; Rannestad, Øyvind. (2007) Significance of hydrogen evolution during cathodic protection. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
  • Academic lecture
    Johnsen, Roy; Baltzersen, Øystein; Waag, Tor Inge; Ahlén, Carl Henrik; Tveit, Edd. (2007) Wall thickness monitoring of new and existing subsea pipelines using ultrasound. NACE International NACE Corrosion 2007 , Nashville, TX 2007-03-11 - 2007-03-15
  • Academic lecture
    Lauvstad, Gro Ø.; Johnsen, Roy; Nyhus, Bård. (2007) Improved resistance towards hydrogen induced stress cracking (HISC) of hot isostatically pressed (HIP) duplex stainless steels under cathodic protection. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
  • Academic lecture
    Johnsen, Roy; Nyhus, Bård; Wästberg, Stig; Lauvstad, Gro Ø.. (2007) New improved method for HISC testing of stainless steels under cathodic protection. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
  • Academic lecture
    Johnsen, Roy; Berget, John; Nilsen, Tonelill. (2007) Influence of porosity on corrosion properties of thermally sprayed coatings. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
  • Academic lecture
    Bjørgum, Astrid Jørgine; Johnsen, Roy; Knudsen, Ole Øystein; Kvernbråten, Ann-Karin. (2007) Repair coating systems for bare steel: Effect of pre-treatment and conditions during application and curing. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
  • Academic lecture
    Knudsen, Ole Øystein; Johnsen, Roy; Bjørgum, Astrid Jørgine; Polanco-Loria, Mario A.; Øyen, Anne. (2007) Internal stress and mechanical properties of pant films. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
  • Academic lecture
    Lauvstad, Gro Ø.; Johnsen, Roy; Borch, Øyvind; Da Silva, Erik Falck; Walmsley, John C. (2007) Breakdown in passivity of austenitic stainless steels in Cl- and H2S - modeling and characterization of the pit initiation process. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
  • Academic lecture
    Baltzersen, Øystein; Waag, Tor Inge; Johnsen, Roy; Ahlén, Carl Henrik; Tveit, Edd. (2007) Wall Thickness Monitoring of new and existing subsea pipelines using ultrasound. NACE NACE Corrosion 2007-01-01 - 2007-02-01

2006

  • Academic lecture
    Johnsen, Roy; Nilsen, Anders Calder. (2006) Cathodic Protection of FPSO's - Current density requirements at potentials more negative than -1000 mV Ag/AgCl. Intenational Association of Corrosion Engineers NACE CORROSION 2006 , San Diego 2006-03-12 - 2006-03-16
  • Academic lecture
    Johnsen, Roy; Berget, John; Rogne, Trond. (2006) Improved Corrosion Resistance of HVOF sprayed ceramic-metallic coatings. International Association of Corrosion Engineers NACE CORROSION2006 , San Diego 2006-03-12 - 2006-03-16
  • Academic lecture
    Johnsen, Roy. (2006) Korrosjonstekniske utfordringer i oljeindustrien. Norsk Forening for Vedlikerhold Årsmøte i Norsk Forening for Vedlikehold , Molde 2006-05-10 - 2006-05-11
  • Academic lecture
    Johnsen, Roy; Mikkelsen, Andre; Wästberg, Stig; Nyhus, Bård; Rogne, Trond. (2006) Influence of ambient pressure on Hydrogen Induced Stress Cracking (HISC) of Duplex Stainless Steels under Cathodic Protection. International Association of Corrosion Engineers NACE CORROSION 2006 , San Diego 2006-03-12 - 2006-03-16
  • Academic lecture
    Johnsen, Roy; Knudsen, Ole Øystein; Bjørgum, Astrid Jørgine; Frydenberg, Tone. (2006) Development of internal stress in organic coatings during curing and exposure. Intarnational Accosiation of Corrosion Engineers NACE CORROSION2006 , San Diego 2006-03-12 - 2006-03-16
  • Popular scientific lecture
    Johnsen, Roy. (2006) Belegg for hydrauliske sylindere i marint miljø - Erfaringer og fremtidig behov. Norges Forskningsråd og Sveiseteknisk Forening Materialdagen , Stavanger 2006-10-25 - 2006-10-25
  • Popular scientific lecture
    Johnsen, Roy. (2006) Hva er korrosjon?. Tekniske Foreningers Servicekontor Strategisk Inspeksjonsstyring , Stavanger 2006-04-25 - 2006-04-26

2005

  • Academic lecture
    Johnsen, Roy. (2005) Hydrogen Induced Stress Cracking of Stainless Steels. European Federation of Corrosion (EFC) EUROCORR'2005 , Lisboa 2005-09-05 - 2005-09-08
  • Academic lecture
    Johnsen, Roy. (2005) HISC - Problemstillinger og utfordringer. Stålmat / Norsk Sveiseteknisk Forening Materialdagen 2005 , Stavanger 2005-10-26 - 2005-10-26
  • Academic lecture
    Johnsen, Roy. (2005) A New Multichannel Ultrasonic System for Subsea Corrosion amd Erosion Monitoring. NACE International CORROSION'2005 , Houston TX 2005-04-03 - 2005-04-07

2004

  • Academic lecture
    Johnsen, Roy. (2004) Experience with the use of Copper Alloys in seawater systems in the Norwegian Sector of the North Sea. European Federation of Corrosion Eurocorr 2004 , NICE 2004-09-12 - 2004-09-16
  • Popular scientific lecture
    Johnsen, Roy. (2004) Robuste beleggsystem for offshore konstruksjoner. Norsk Korrosjonsteknisk Forening - Avd. Stavanger Bransjeseminar Materialer og Belegg , Stavanger 2004-05-25 - 2004-05-26
  • Popular scientific lecture
    Johnsen, Roy. (2004) Malingsvedlikehold - Verktøy for planlegging og utførelse. Teknologisk Institutt Overflatedagene 2004 , Oslo 2004-11-08 - 2004-11-10
  • Popular scientific lecture
    Johnsen, Roy. (2004) Korrosjonsproblem i offshore industrien - Hva har vi lært?. Stålmat (NFR) Materialdagen 2004 , Stavanger 2004-10-27 - 2004-10-27

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