Abstract
This study investigates hydrogen embrittlement cracking (HEC) upon indentation in a high-strength steel. When an indentation test is applied to the high-strength steel, i.e., steel that has absorbed hydrogen, radial cracks appear around the impression, whereas as-received steel with no hydrogen absorption does not produce any cracks. An experimental/computational investigation is carried out to elucidate the mechanism of such indentation cracks caused by hydrogen embrittlement. The crack propagation is computed based on cohesive zone model in finite element method in order to investigate stress intensity factor at the crack. It is found that crack initiates at loading, and then it propagates under unloading. The value of stress intensity factor at indentation crack tip agrees well with the threshold value of crack propagation of HEC (K_<ISCC>). This indicates that the length of the indentation HE crack can roughly estimate the value of K_<ISCC>.
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