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Effect of grain refinement on the hydrogen embrittlement of 304 austenitic stainless steel

查看全文 作　　者：[1,2,3]Y.H.Fan;[1]B.Zhang;[3]J.Q.Wang;E.-[3]H.Han;[3]W.Ke 高影响力作者 机构地区：[1]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;[2]School of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China;[3]CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2019年第35卷第10期,共7页高影响力期刊 基　　金：financially supported by the National Natural Science Foundation of China (No. U1608257) 摘　　要：The effect of grain size(in the range from 4 μm to 12 μm) on the hydrogen embrittlement(HE) of 304 austenitic stainless steel(ASS) was studied. HE susceptibility result shows that HE resistance increases with grain refinement. Electron backscattered diffraction kernel average misorientation(EBSD-KAM)mapping shows that the strain localization can be mitigated by grain refinement. Hence, strain localization sites which act as highways for hydrogen diffusion and preferred crack initiation sites can be reduced along with grain refinement, leading to a high HE resistance. Meanwhile, grain size shows no influence on the strain induced martensite(SIM) transformation during the hydrogen charging slow strain tensile test(SSRT). Hence, the SIM formed during hydrogen charging SSRT is not responsible for the different HE resistance of 304 ASSs with various grain sizes. Hydrogen diffusion is supposed to be controlled by a competition between short-circuit diffusion along random grain boundary(RGB) and hydrogen trapping at dislocations, leading to a maximum hydrogen diffusion coefficient in the 304 ASS with an average grain size of 8 μm. 关 键 词：STAINLESS steel Grain REFINEMENT Hydrogen EMBRITTLEMENT SEM EBSD
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