研究了应变率对中锰钢的动态拉伸性能的影响.结果表明.在高应变率下中锰钢的室温强度在比低应变率增加近1 倍.塑性由22 8%增加到67. 4%.随着应变率的提高.孪晶数目增加.相应的塑性增加.显著的增塑效应与孪生变形机制有关.也与断裂模式由低应变率的沿晶断裂转化为高应变率的晶内韧窝有关.但不是由相变或绝热温升引起的.
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