Hot deformation behavior and flow stress model of F40MnV steel

Abstract

Single hit compression tests were performed at 1 223–1 473 K and strain rate of 0.1–10 s⁻¹ to study hot deformation behavior and flow stress model of F40MnV steel. The dependence of the peak stress, initial stress, saturation stress, steady state stress and peak stain on Zener-Hollomon parameter were obtained. The mathematical models of dynamic recrystallization fraction and grain size were also obtained. Based on the tested data, the flow stress model of F40MnV steel was established in dynamic recovery region and dynamic recrystallization region, respectively. The results show that the activation energy for dynamic recrystallization is 278.6 kJ/mol by regression analysis. The flow stress model of F40MnV steel is proved to approximate the tested data and suitable for numerical simulation of hot forging.

Keywords

microalloyed forging steel / flow stress / dynamic recovery / dynamic recrystallization / Zener-Hollomon parameter