设计出一种 Fe－Mn－C 系 TRIP/TWIP 钢，通过静态拉伸测试热轧钢力学性能，并利用 EBSD、XRD、SEM 分析其拉伸变形后的微观组织变化．结果表明：Fe－20Mn－0．6C 钢板热轧后表现出优异的力学性能，真应变可达到0．59，抗拉强度为1631 MPa．热轧后组织为全奥氏体组织，晶粒尺寸较大并且伴有大量的退火孪晶，变形后出现孪生变形和马氏体相变；变形量较小时，马氏体相变并不明显，较大变形量时大量的马氏体在孪晶界和晶界附近弥散分布；并且随着应变量增大晶粒内出现二次孪生，并与一次孪生呈现多种交割方式．% Tensile tests were carried out to explore the mechanical properties of a designed TRIP /TWIP steel, and the microstructures of the hot rolled steel before and after deformation have been investigated by using the electron -backscattering diffraction (EBSD), X-ray diffraction (XRD), and scanning electron micrograph (SEM).The re-sults indicated that the steel after hot rolling exhibited attractively mechanical properties , while the true strain rea-ches 0.59 and the true stress is 1631MPa.The microstructure of the hot-rolled steel mainly contains the austenitic matrix with large grain sizes and lots of annealing twins .Twins and martensitic plates are occurred after tensile de -formation.The martensite phase increases with increasing strain and occurs at the vicinity of twin boundaries and /or grain boundaries, and the second twinning systems have been observed with increasing strain ,which intersected with the first twinning systems by different styles .
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