定荷重フラクトグラフィ法による水素助長割れ特性の検討

概要

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The holding-load and fractographic (HLF) method proposed by the present authers was applied to hydrogen assisted cracking (HAC) test for five different heat-treated 2-1/4Cr-1Mo steels with different strength, and the effects of material strength and test condition on the threshold stress intensity factor K_<IH> and fracture toughness K_<CH> of hydrogen charged materials were discussed. The KIH decreased with an increase in accumulated hydrogen density in a specimen and showed just a little dependence on the tensile strength. The K_<CH> Was shown to be independent of the hydrogen density and the amount of crack extension during the HAC test, and it approximately coincided with the fracture toughness K_<IC> before hydrogen absorption. These results indicate the applicability of the HLF method to HAC test with high accuracy.
社団法人日本材料学会の論文
1992-09-15