水素脆化した高強度鋼の粒界き裂形成を支配する要因について

概要

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The fracture behavior of high strength steel under the influence of hydrogen was studied, with an emphasis on the conditions for the formation of intergranular (IG) cracks. Mechanical tests were carried out using two types of high strength steels (Series A and B) which had been heat-treated to obtain the same level of yield stress bus different grain boundary properties. The specimens were cathodically charged with hydrogen under constant stress conditions. Experimental analyses revealed that a high stress concentration at a fatigue pre-crack tip is required for generation of IG cracks. The morphologies of the fracture surfaces were intergranular (IG) and transgranular (TG) modes, respectively, in the two types of specimen, and the differences in morphology were found to result from differences in the amount of impurities segregated at the grain boundaries of the specimens.
社団法人日本機械学会の論文
1997-07-25