为开发强度和塑性良好配合的第三代汽车钢，采用CCT-AY-Ⅱ型钢板连续退火机模拟分析了不同退火温度和时间对0．1C-5Mn中锰TRIP钢组织性能的影响规律．采用SEM和EBSD等微观分析方法观察不同工艺下制备的中锰TRIP的微观组织，利用XRD方法测量残余奥氏体体积分数，通过实验测量其力学性能．结果表明：实验的中锰TRIP钢在650℃保温3 min退火后获得最佳的综合力学性能，其抗拉强度为1022 MPa，总延伸率为19．3％，强塑积为20 GPa·％；应变前期试验钢中大量残余奥氏体发生转变，超细晶间的协调机制对试验钢的塑性起主导作用．
To develop the third generation of automobile steel which has good balance of strength and plasticity, the effect of different annealing temperature and time on microstructure and mechanical properties of 0.1C-5Mn medium-manganese TRIP steel were investigated on heat treatment system for thin steel Sheet CCT-AY-Ⅱ type. Microstructure of the steel was observed by means of SEM and EBSD. The amount of retained austenite in the steel was determined by X-ray diffraction analysis and its mechanical properties were measured in the laboratory. The results show that the best comprehensive mechanical properties are obtained for the experimental steel annealed at 650 ℃ for 3 min. Its tensile strength is 1 022 MPa, total elongation is 19.3%, and the product of tensile strength and elongation is 20 GPa·%;In the early strain stage, a large amount of retained austenite transforms, and the ultra-fine grains coordination mechanism plays a leading role for plasticity of the experimental steel.
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