Effect of Zr on Dynamic Recrystallization Behavior of Ti‐Microalloyed Low Carbon Steels
Min Zeng, Jianchun Cao
Abstract
The dynamic recrystallization (DRX) behavior of Ti‐ and Ti–Zr‐microalloyed steels are systematically investigated on a Gleeble‐3800 thermomechanical simulator at the deformation temperatures from 900 to 1100 °C and strain rates from 0.001 to 10 s −1 . The hot deformation activation energies of the two tested steels are obtained by regression method, and the hot working equations are also established. From the strain hardening rate and stress curve, the critical strains are obtained, and the recrystallization volume fraction model is established. The results show that DRX occurred in both tested steels at high temperature and low strain rate. The activation energy of Ti‐microalloyed steel increased 56.6 kJ mol −1 by adding Zr. When the strain rate is low, the flow stress and critical strains for Ti–Zr‐microalloyed steel are higher than that of Ti‐microalloyed steel.