3509 高圧水素中に曝露したオーステナイト系ステンレス鋼の水素侵入特性と疲労き裂進展挙動(S20-2 水素チャージ材の強度特性,S20 材料強度特性に及ぼす水素の影響)

概要

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Hydrogen penetration properties of austenitic stainless steels, SUS304, SUS316L and SUS310S pre-strained and exposed to high pressure hydrogen was investigated. In SUS304, hydrogen penetrated more deeply with the increase of strain-induced martensite phase. In SUS316L and SUS310S where the amount of martensite didn't increase with pre-strain in this study, it raised hydrogen content but hardly influenced the diffusion of hydrogen. In the hydrogen-charged specimens of SUS304, the fatigue crack growth rate was accelerated. The acceleration was larger in the pre-strained SUS304 than in the SUS304 which was free from pre-strain. The crack in the hydrogen-charged specimens were less zigzag than in the uncharged specimens. The fracture surfaces in the hydrogen-charged specimens had flat areas. These are considered to be caused by slip localization.
社団法人日本機械学会の論文
2006-09-15