OS2203 SUS316LおよびSUS304の水素脆化におよぼす転位と水素の相互作用(OS22-2 水素と材料ミクロ挙動,OS-22 水素環境の材料強度特性への影響)

概要

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Although the interaction between dislocation and hydrogen in bcc metal such as pure iron plays the essential role in hydrogen embrittlement, little is known about the interaction in fcc metal such as stainless steel. Hydrogen spectra evolved from SUS 316L and 304 stainless steels during elasticity and plastic deformation were detected using a quadrupole mass spectrometer. Hydrogen desorption increased rapidly when plastic deformation began for SUS 316L, since dislocations drag hydrogen to the specimen surface. In contrast, hydrogen desorption increased with applying strain for SUS 304, because of phase transformation from austenite into martensite with larger hydrogen increased with decreasing strain rate. This result indicates that dislocation can drag and transport more amount of hydrogen when dislocation velocity approaches hydrogen diffusion rate. These lead conclusion that the interaction between dislocation and hydrogen occurs in not only bcc but also fcc metal. In the present study, relation between interaction between dislocation and hydrogen and hydrogen embrittlement is considered.
2011-07-16