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采用Gleeble3500对中碳低硅TRIP钢进行了连续退火模拟,研究了不同两相区及贝氏体区等温温度对组织、力学性能及应变硬化规律的影响。结果表明,在780℃+400℃处理时获得最大的残余奥氏体量、伸长率及强塑积。450℃贝氏体等温时残余奥氏体转变量最大,由于残余奥氏体稳定较差,大量转变发生在变形早期阶段,其对伸长率的贡献不大。与之相反,400℃时残余奥氏体的力学稳定性较好,能较均匀且缓慢地发生转变,从而获得最好的塑性。
The continuous annealing simulation of medium carbon low silicon TRIP steel was carried out by using Gleeble3500 to study the influence of isothermal temperature on microstructure, mechanical properties and strain hardening law of different two-phase region and bainite region. The results show that the maximum amount of retained austenite, elongation and ductility are obtained at 780 ℃ +400 ℃. At 450 ℃, the amount of retained austenite transformation is the largest at isothermal temperature. Due to the poor stability of retained austenite, a large amount of transformation takes place in the early stages of deformation, and its contribution to the elongation is insignificant. In contrast, the retained austenite at 400 ° C has better mechanical stability and transitions more evenly and slowly, resulting in the best ductility.