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采用SEM、TEM、STEM、XRD、EBSD等实验分析方法对中锰钢(0.2C5Mn)在奥氏体逆相变不同时间退火过程中的微观组织演变进行了分析。结果表明:中锰钢在650℃短时间逆相变退火时析出大量M3C型碳化物,随着退火时间的延长,逆相变奥氏体形成长大,获得马氏体、奥氏体双相片层状组织。马氏体与逆相变奥氏体晶粒取向服从K-S关系,且两相板条平均宽度在0.5μm左右。退火过程中锰元素出现由淬火组织平均分布逐渐向逆相变奥氏体富集的配分行为,长时间退火后形成体积分数为30%的逆相变奥氏体,抗拉强度为960MPa,屈服强度为500MPa,总伸长率为40%,强塑积高达38.4GPa·%。
The microstructure evolution of medium manganese steel (0.2C5Mn) during annealing at different times of austenite transformation was analyzed by SEM, TEM, STEM, XRD and EBSD. The results show that a large amount of M3C carbides are precipitated during the reverse phase transformation annealing at 650 ℃ for short time, and as the annealing time prolongs, the reverse phase transformation austenite grows up and gets martensite and austenite dual phase Layered tissue. The martensite and reverse transformation austenite grain orientation obey K-S relationship, and the average width of two-phase slab is about 0.5μm. During the annealing process, the distribution of Mn gradually increases from the average quenched structure to the reverse transformed austenite. After annealing for a long time, the reverse phase transformation austenite with the volume fraction of 30% is formed, the tensile strength is 960 MPa, The strength is 500MPa, the total elongation is 40%, the strong plastic product is as high as 38.4GPa ·%.