冷間加工した準安定オーステナイト系ステンレス鋼の水素ぜい化

概要

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The effect of cold-working on hydrogen embrittlement of metastable austenitic stainless steels has been investigated. The specimens were made of SUS302 and SUS304, which had different austenite stabilities, and were cold-worked by 20% to 80%. Hydrogen embrittlement of H-charged specimens was measured by bend testing. The main results are as follows:(1) The bend deformation resistance decreased due to hydrogen charging.(2) Hydrogen embrittlement depended on Vickers hardness or strain-induced martensite content but not on the type of specimen.(3) The decrease in bend deformation resistance by hydrogen charging was recorvered by keeping the specimen at room temperature.(4) Hydrogen embrittlement did not depend on the amount of hydrogen absorbed. The amount of hydrogen absorbed by SUS302 increased with cold-working, whereas that absorbed by SUS304 decreased with cold-working.(5) Hydrogen charging caused blisters on SUS302 and cracks on SUS304. Blisters tended to be induced on the severely cold-worked specimens and cracks on the mildly cold-worked ones. The difference in surface state between H-charged SUS302 and SUS304 specimens indicated different hydrogen absorption mechanisms for these two steels.