The constitutive analysis and microstructural characteristics of Ti microalloyed medium-Mn steel are studied here by hot deformation test in the temperature range of 1123–1473 K and at the strain rates from 0.01 to 10 s⁻¹ based on thermal simulation. Furthermore, the effect of Ti addition on hot deformation behavior is elucidated. The results indicate that the fluctuation of flow stress, which is sensitive to deformation conditions, is a result of dynamic equilibrium between strain hardening and thermally activated work softening. Flow stress constitutive equations for low Ti and high Ti content steels are developed with an average deformation activation energy Q of 456.1 and 350.9 kJ mol⁻¹, respectively. The morphologies of prior austenite grain (PAG) and dynamic recrystallization (DRX) behavior are dramatically influenced by the compression parameters and the Ti content. The PAG size decreases with the increase in the Ti content, which can accelerate the progress in the DRX process. As a result, the refined martensite lath is obtained in the steel with high Ti content.

中文翻译：

---

Ti添加对中锰微合金钢热变形行为的显着影响

在此基于热模拟，通过在 1123-1473 K 温度范围和 0.01 至 10 s ^-1应变速率下的热变形试验，研究了 Ti 微合金化中锰钢的本构分析和显微组织特征。此外，还阐明了 Ti 添加对热变形行为的影响。结果表明，对变形条件敏感的流动应力的波动是应变硬化和热激活加工软化之间动态平衡的结果。开发了低 Ti 和高 Ti 钢的流动应力本构方程，平均变形活化能Q为 456.1 和 350.9 kJ mol ^-1， 分别。原始奥氏体晶粒 (PAG) 的形貌和动态再结晶 (DRX) 行为受压缩参数和 Ti 含量的显着影响。PAG尺寸随着Ti含量的增加而减小，这可以加速DRX过程的进展。结果，在高Ti含量的钢中获得细化的马氏体板条。