Delayed failure tests were carried out on Ni−Cr−Mo steel quenched and tempered at 673 K in aNaCI aqueous solution in hydrogen charging condition, and the crack branching as well as crack propagation behaviors were investigated.The crack propagation rate dα/d increases with increase in cathode charging current density, ゼ,and da/d云increases to a maximum and then decreases with increase in the increasing rate of stress intensity factor,左. The stress intensity factor at crack branching,1(IB, decreases to a
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