加工硬化したオーステナイト系ステンレス鋼SUS316Lの疲労特性に及ぼす水素の影響(<小特集>水素エネルギーシステムに使用される材料の強度問題)

概要

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Fatigue tests were conducted for hydrogen charged and work-hardened SUS 316 L austenitic stainless steel, using smoothed and notched specimens of 1mm thichness at frequency of 150〜200Hz under stress ratio of R=0. The work-hardened steel was prepared with cold rolling at 20 or 40% reduction of cross-sectional area, and the hydrogen charging was conducted for 500 hours, leading to hydrogen content of 20〜50 mass. ppm. In the case of smoothed specimens, fatigue strength of the 40% rolled version was decreased due to the hydrogen charging, while the 0 and 20% rolled versions showed negligible difference between hydrogen charged and uncharged specimens. The hydrogen charged specimens of the 40% rolled version revealed internal fractures which occurred below a fatigue limit of the uncharged specimens and eliminated the fatigue limit. In the case of notched specimens, fatigue limits were equal between hydrogen charged and uncharged specimens even in the 40% rolled version. However, fatigue lives were a little decreased due to the hydrogen charging in case of the 40% rolled version at frequency of 150〜200Hz.
社団法人日本機械学会の論文
2007-12-25