オーステナイト・ステンレス鋼の水素損傷機構に関する考察

概要

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The existence of clusterings of platelet tangled dislocations in 304 steel, produced at the grain boundary or internal interfaces by the precipitation of atomic hydrogen, was demonstrated by the transmission electron microscope. Futhermore macroscopic phenomena caused by this microscopic hydrogen defects were observed in hydrogenated stainless steel, that is, 1) the increase of flow stress 2) anomalous behavior of recovery process in hydrogen embrittlement 3) anomalous increase of intergranular corrosion loss. The initiation sites of microcracks due to hydrogen embrittlement in austenitic stainless steel were grain boundaries or carbide interfaces, and these were the sites of hydrogen defects. The propagation process of the microcracks by hydrogen embrittlement depended on the austenitic stability to martensite transformation under tensile stress, and the interfaces of martensite lath provided the most preferential path of microcracks.
社団法人日本鉄鋼協会の論文
1978-07-01