奥氏体锰钢高应变速率孪生诱导塑性

Twinning Induced Plasticity at High Strain Rate for Austenitic Manganese Steel

研究了应变速率对奥氏体中高锰钢塑性的影响。结果表明:室温拉伸,中锰钢伸长率由低应变速率10-3s-1时的22.8%增加到高应变速率103s-1时的67.4%,增加2倍;高锰钢伸长率由低应变速率10-3s-1时的49.5%增加到高应变速率103s-1时的64.4%,增加30%。中高锰钢高应变速率增塑效应,主要与孪生变形大量启动有关,其断裂机制由低应变速率的沿晶断裂转化为高应变速率的晶内韧窝韧性断裂。

Effects of strain rate on plasticity of austenitic manganese steels have been investigated. The experimental results show that the plasticity increased with increasing strain rate, the elongation increment was as high as 2 times from 22. 8% in the strain rate 10 -3 s-1 to 67. 4% at 103 s-1 for medium manganese steel, while increased 30% from 49. 5% at the strain rate 10- 3 s-1 to 64. 4% at 103 s-1 for high mangnese steel. The plasticity increasing effect induced by high strain rate is related to the startup of twinning deformation and the fracture mechanism changed from intergranular fracture at low strain rate to intragranular dimple at high strain rate.