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应用弹塑性断裂力学和△J参数,研究了16Mng钢短裂纹的纯机械疲劳和氢腐蚀疲劳特性.并用da/dN=C(△J)~n计算了裂纹的扩展速度和门槛值.用金相法考察了裂纹扩展途径.结果表明,氢的渗入降低了裂纹扩展的门槛值,加速了裂纹的扩展速度.从而增加了16Mng钢低频疲劳破坏的危险性.
The pure mechanical fatigue and hydrogen corrosion fatigue characteristics of 16Mng steel short crack were studied by means of elastic-plastic fracture mechanics and △ J parameters. The crack growth rate and threshold were calculated by da / dN = C (△ J) ~ n. The results show that the infiltration of hydrogen reduces the threshold of crack propagation and accelerates the propagation of cracks, which increases the risk of low-frequency fatigue failure of 16Mng steel.