高锰奥氏体TRIP/TWIP钢的组织和力学性能

Microstructure and Mechanical Properties of High Manganese Austenite TRIP/TWIP Steels

研究了两种不同锰含量的高锰奥氏体钢在室温拉伸变形过程中力学性能和组织的变化。结果表明，随着钢中锰含量的变化，实验钢在流变应力的作用下出现相变诱导塑性的TRIP效应和孪晶诱导塑性的TWIP效应。在1×10^-3s^-1的初始应变速率条件下，锰的质量分数为23．8％的实验钢可达到666MPa的抗拉强度和67％的伸长率，而锰的质量分数为33％的实验钢可达到540MPa的抗拉强度和97％的伸长率。并且在10^-3-10^-1s^-1的初始应变速率范围内，实验钢的抗拉强度对于流变应力不敏感，而实验钢的塑性则表现出一定的应变速率敏感性。由于该钢具有较好的综合力学性能，有望作为新一代高强度、高塑性汽车用钢。

The microstructure and mechanical properties of two high manganese austenite steels during tensile tests at room-temperature were studied. The results indicate that the steels exhibit transformation induced plasticity （TRIP） and twinning induced plasticity （TWlP） under flow stress. At the initial strain rate of 10^-3 s^-1 , the tensile strengths of 23.8% Mn and 33% Mn samples were 666 MPa and 540 MPa and their elongations were 67% and 97% respectively. In the range of initial strain rate of 10^-3×10^-3s^-1 , nearly no strain rate sensitivity to flow stress in tensile test was observed, but such sensitivity was observed in plasticity. The steel, can be taken as the new generation high-strength and high-plasticity automobile steel due to the better integrated mechanical properties.