中文摘要：

利用控轧控冷工艺开发了锰质量分数为18．8％的热轧高锰TRIP／TWIP钢板，分析了轧制工艺参数对热轧高锰钢组织和性能的影响，讨论了实验钢的断裂机理。结果表明：通过控轧控冷方法可以热轧出抗拉强度达到940MPa左右，断裂伸长率在40％以上的高锰钢板。冷却速度和卷取温度等工艺参数对实验钢组织性能影响不是非常明显。高锰钢优异的力学性能是TRIP和TWIP效应共同作用的结果。高锰钢拉伸呈韧性断裂，裂纹多沿奥氏体／马氏体晶界萌生、扩展。

英文摘要：

A hot rolled high manganese TRIP/TWIP steel was developed by TMCP technology. The effects of processing parameters of TMCP on microstructures and the relationship between the microstructure and mechanical were studied. The results show that this high manganese TRIP/TWIP steel could be produced by hot rolling. Meanwhile it exhibits high ultimate tensile strength （940 MPa） and elongation （40%） at strain rates of 10^-3 s^-1. The influences of TMCP parameter, such as cooling rate and coiling temperature, are not very notable on mechanical properties of this high manganese steel. Its excellent mechanical properties are attributed to TRIP/TWIP effects. The high manganese steel shows ductile rupture after tensile test, then the cracks always initiate and expend along the grain boundary between austenite and martensite.