Probing hydrogen effect on nanomechanical properties of X65 pipeline steel using in-situ electrochemical nanoindentation

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:824

Article

Wang, Dong¹  Hagen, Anette Brocks²  Wan, Di¹  Lu, Xu¹  Johnsen, Roy¹ 

[1] Norwegian Univ Sci & Technol NTNU, Dept Mech & Ind Engn, N-7491 Trondheim, Norway

[2] SINTEF Ind, N-7456 Trondheim, Norway

关键词: Hydrogen embrittlement;    Carbon steel;    In-situ test;    Nanoindentation;    Dislocation;   

DOI  :  10.1016/j.msea.2021.141819

来源: Elsevier

【 摘 要 】

The hydrogen effect on a X65 carbon steel was investigated using in-situ electrochemical nanoindentation approach. The alterations in elastic behavior, pop-in load, and hardness under hydrogen-free and hydrogencharged conditions in both ferrite and bainite were compared and discussed. The results demonstrated a nonaffected elastic behavior by hydrogen in both microconstituents. The homogeneous and heterogeneous dislocation nucleation are proposed as the dominant mechanisms for pop-in behavior in ferrite and bainite, respectively. In addition, the reduction of pop-in load by hydrogen in both microconstituents indicates a hydrogenenhanced dislocation nucleation in both homogenous and heterogeneous manners. Moreover, a hydrogeninduced hardness increment was detected in both microconstituents, which is related to the hydrogenenhanced lattice friction on dislocations. Also, the more prominent hardness increment in bainite was caused by its significantly more trapping sites.

【 授权许可】

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