Hydrogen-induced delayed fracture of a Fe–22Mn–0.6C steel pre-strained at different strain rates

Hydrogen-induced delayed fracture under loading was investigated in a Fe–22Mn–0.6C twinning-induced plasticity steel that had been pre-deformed at various strain rates. Hydrogen-induced delayed fracture was suppressed by increasing the strain rate of the pre-deformation. In this study on the strain-rate effect, factors affecting the delayed fracture were found to be the negative strain-rate sensitivity of flow stress, stress drop caused by the relaxation phenomenon, and the increase in material strength due to strain aging.