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采用CCT-AY-Ⅱ型钢板连续退火机对高强TRIP钢进行热处理,获得铁素体、贝氏体,残留奥氏体和少量马氏体的组织。采用SEM、EBSD等微观方法观察制备的TRIP钢的微观组织,利用XRD法测量了残留奥氏体量,实验测量了其力学性能。结果表明:820℃两相区退火,410℃贝氏体区后实验钢获得良好的综合力学性能,屈服强度达到804 MPa,抗拉强度928 MPa,总伸长率27.55%,强塑积25.57 GPa·%。这主要是退火后实验钢合适的相比例以及一定量残留奥氏体共同作用的结果;实验钢在高速拉伸下,应力随应变的增加而增加,实验钢在高速下表现出良好的力学性能,不仅具有很高的强度,而且表现出良好的塑性,高速下实验钢良好的力学性能是因为钢中大量残留奥氏体发生TRIP效应造成的。
High-strength TRIP steel was heat-treated with CCT-AY-Ⅱ steel plate continuous annealing machine to obtain ferrite, bainite, retained austenite and a small amount of martensite. The microstructure of the prepared TRIP steel was observed by SEM, EBSD and other microscopic methods. The amount of retained austenite was measured by XRD and the mechanical properties were measured experimentally. The results show that the experimental steel in 410 ℃ bainite region has good mechanical properties after being annealed in the two-phase region of 820 ℃. The yield strength reaches 804 MPa, tensile strength 928 MPa, total elongation 27.55%, and plastic modulus 25.57 GPa %. This is mainly the result of the proper phase ratio and the residual austenite in the experimental steel after annealing. Under high-speed tensile stress, the stress increases with the increase of strain, and the experimental steel shows good mechanical properties at high speed , Not only has high strength but also shows good ductility. The good mechanical properties of experimental steels at high speed are due to the TRIP effect of a large amount of retained austenite in steel.