Effect of high-pressure hydrogen environment in elastic and plastic deformation regions on slow strain rate tensile tests for iron-based superalloy A286

卷:48

Article

关键词: AUSTENITIC STAINLESS-STEELS;    CELL ELECTRIC VEHICLE;    MECHANICAL-PROPERTIES;    EMBRITTLEMENT;    STRENGTH;    SUSCEPTIBILITY;    TECHNOLOGY;    BEHAVIOR;    SUH660;    TEMPERATURE;   

DOI  :  10.1016/j.ijhydene.2023.01.266

来源: SCIE

【 摘 要 】

To investigate the effects of a high-pressure hydrogen environment in the elastic and plastic deformation regions, we performed slow strain-rate tensile tests of iron-based superalloy A286 at 150 degrees C by switching the atmosphere from 70 MPa hydrogen to air during the tests. The relationship between the nominal strain exposed to a hydrogen environment and the relative reduction in area (RRA) revealed that in the plastic deformation region, the RRA value decreased gradually depending on the nominal strain exposed to hydrogen, but in the elastic deformation region, the RRA value decreased rapidly. The RRA value further decreased when the stress cycle was applid in the elastic region. The fracture surface exhibited an intra-granular slip plane fracture similar to that of the hydrogen-charged specimen. These phe-nomena suggest that the lattice decohesion theory is dominant in the elastic region, where hydrogen embrittlement occurs owing to an increase in the content of dissolved hydrogen.(c) 2023 The Author(s). Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).

【 授权许可】

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