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Abstract
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 KQ value of QC crack tip corresponds to the value of KIH 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.
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