水素環境下における鋼の限界き裂挙動を支配する要因に関する一考察

概要

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A critical behavior of crack growth in delayed fracture in high strength steel was studied with fine grained (18 μm) and coarse grained (105 μm) specimens which had been heat-treated to obtain the same level of yield stress. The specimens were cathodically charged with hydrogen under sustained load conditions. SEM fractographic examination revealed that the essential process of delayed fracture, in which a formation of quasi-cleavage (QC) crack triggers the intergranular (IG) crack after subcritical propagation into a critical size, is almost the same irrespective of the grain size. Experimental analysis showed that the K_Q value of QC crack tip corresponds to the value of K_<IH> and the critical behavior of delayed fracture would be affected not only by the critical condition for IG crack propagation but also by the resistance of transgranular crack propagation.
社団法人日本機械学会の論文
1999-07-25