为研究连续退火工艺生产中锰TRIP钢汽车板的可行性，采用CCT-AY-Ⅱ型钢板连续退火机模拟分析了不同锰含量对中锰TRIP钢组织性能的影响规律．采用SEM、TEM和EBSD等微观分析方法观察不同锰含量中锰TRIP的微观组织，利用XRD法测量了残留奥氏体量，实验测量其力学性能．结果表明：试验钢在650℃保温3 min时，随着锰质量分数（4．8％≤w（Mn）≤8％）的增加，屈服强度先增加后降低，抗拉强度持续升高，断后延伸率则基本不变，维持在20％左右，残余奥氏体含量也随着锰含量的增加而增加；当锰质量分数超过6％（含6％）时，真实应力-应变曲线由于动态应变时效而呈锯齿状，且加工硬化指数远大于5Mn钢．试验钢的高塑性由亚稳奥氏体的TRIP效应和超细晶铁素体或马氏体共同提供．
To study the feasibility of the production of automobile steel of medium-manganese TRIP steel with the continuous annealing process, the effect of different manganese content on microstructure and mechanical properties of medium-manganese TRIP steel was investigated on heat treatment system for thin steel sheet CCT-AY-Ⅱtype. The microstructure of the steel with different Mn content was observed by means of SEM, TEM 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. When the steel is at 650℃ for 3 min, and with the increase of manganese content, the yield strength first increases and then decreases, the tensile strength continuously rises, while the elongation almost maintains at about 20%. Research on the microstructure shows that the retained austenite increases with the increasing of Mn content. When Mn content is more than 6%( including 6%) , the real stress-strain curves appears jagged due to the dynamic strain aging, and the work hardening exponent is far greater than that of the 5Mn steel. TRIP effect of metastable austenite and ultrafine ferrite and martensite together provide high plasticity.
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