マルテンサイト系ステンレス鋼の疲労強度に及ぼす水素チャージの影響

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書誌事項

タイトル別名
  • Effect of Hydrogen Charge on Fatigue Strength of Martensitic Stainless Steel
  • マルテンサイトケイ ステンレス コウ ノ ヒロウ キョウド ニ オヨボス スイソ チャージ ノ エイキョウ

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説明

The effect of hydrogen on high cycle fatigue properties of a martensitic stainless steel was investigated. In the Fuel Cell (FC) system, many components are exposed to high pressure hydrogen environment under cyclic loading. In this study, hydrogen was artificially charged into specimen of a martensitic stainless steel, 0.44C-13Cr-0.13N steel, and the fatigue properties were compared with those of the specimens without hydrogen charge. Fatigue strength and fatigue life decreased with increasing hydrogen content. It implies that the fatigue threshold of the microstructure which contains high hydrogen content is much lower than that of the as-heat-treated microstructure. Specimens having a longer fatigue life had a particular morphology named ODA (Optically Dark Area) besides the inclusion at fracture origin. The fracture origin of hydrogen charged specimens showed smaller ODAs than as-heat-treated specimens. The upper bound of the critical hydrogen content level resulting ODA lies between 1.0ppm and 2.0ppm. The condition for the critical size of ODA for the start of conventional fatigue crack growth was analyzed by the fracture mechanics. The critical stress intensity factor range ΔKODA for the critical size of ODA of as-heat-treated specimens can be correlated with the threshold stress intensity factor range ΔKth expressed by the √area parameter model for small cracks.

収録刊行物

  • 材料

    材料 54 (12), 1217-1224, 2005

    公益社団法人 日本材料学会

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