中碳低硅TRIP钢组织与力学性能的研究
Study on Microstructure and Mechanical Properties of Medium Carbon Low Silicon TRIP Steel
黄 澍, 周 磊, 符仁钰, 李 麟
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作者单位：上海大学 材料科学与工程学院, 上海 200072
中文关键字：中碳低硅TRIP钢； 组织； 力学性能； 瞬时应变硬化指数
英文关键字：medium carbon low silicon TRIP steel; microstructure; mechanical properties; incremental work-harding exponent
中文摘要：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。
英文摘要：Continuous annealing simulation of medium carbon low silicon TRIP steel was conducted using Gleeble 3500. The microstructure, mechanical properties and strain-hardening behaviors of TRIP steel were investigated by changing intercritical annealing and bainite transformation temperature. The results show that the maximum of the retained austenite volum, elongation and product of strength and ductility are obtained at 780 ℃ + 400 ℃. The maximum change of retained austenite appears at 450 ℃, and large amounts of retained austenite transforms in the initial stage of deformation and little contribution to elongation due to the poor stability of retained austenite. In contrast, the retained austenite has good mechanical stability at 400 ℃ and transforms more uniformly and slowly to get the best plasticity.