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通过物理模拟系统上的轧制实验,研究了基于动态相变的热轧细晶C-Mn-Si和C-Mn-Al-Si系多相钢的组织及性能特点。结果表明,通过动态相变和相变后冷却的控制,可以得到铁素体晶粒尺寸较为细小,珠光体团径较小,片层间距较薄,以及一定体积分数的贝氏体和残留奥氏体所组成的多相组织。与铁素体粒径相类似的细晶钢相比,由于组织的细晶化,多相化,以及残留奥氏体塑性变形时所产生的TRIP效应,使实验钢具有强度较高、塑性较好,屈强比较低,加工硬化能力较高的特点。
The microstructure and properties of hot-rolled fine-grained C-Mn-Si and C-Mn-Al-Si multi-phase steels based on dynamic phase transition were investigated by means of rolling experiments on a physical simulation system. The results show that the bainite and residual austenite can be obtained by the control of dynamic phase transition and post-phase cooling, and the ferrite grain size is smaller, the pearlite size is smaller, the lamellar spacing is thinner, and the volume fraction of bainite and residual austenite Multi-phase structure consisting of martensite. Compared with the fine grain size ferrite similar to the microstructure due to the fine crystallization, multiphase, as well as residual austenite plastic deformation TRIP effect, the experimental steel has higher strength, plasticity than Good, yield lower, higher capacity for hardening.