高温高圧水素による 304 ステンレス鋼の脆化について

概要

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The change of mechanical properties of 304 stainless steel exposed to hydrogen at high temperature and high pressure was examined with reference to the change of the morphology and distribution of M_<23>C_6 carbide in the steel. Hydrogenated 304 stainless steel was very brittle when M_<23>C_6 carbides precipitated continuously at grain boundary in the form of developed dendritic particles. The fracture mode of hydrogenated 304 steel aged at 650℃ for 70hr changed from a ductile to an intergranular type depending on the carbide morphology and its distribution. A ductile fracture mode, however, reappeared with dehydrogen treatment in vacuum. Hydrogen was observed to evolve at the grain or twin boundary of 304 steel. Therefore it is suggested that hydrogen is trapped at the interfaces of the grain or twin boundary carbides, and the nucleation and propagation of hydrogen embrittlement cracking may be caused by hydrogen trapped there.
社団法人日本鉄鋼協会の論文
1973-12-01