Abstract
ABSTRACT In this paper, the dynamic recrystallisation (DRX) behaviour under the strain rate of 0.1 s−1, 1 s−1 and 10 s−1 within the deformation temperature of 900°C∼1100°C of Ti-Zr microalloyed low carbon steel with different Zr content was studied using Gleeble-3800 thermal simulation test machine. The stress–strain curves of investigated steels were obtained under the diferent deformation conditions, and the thermal deformation equation and DRX volume fraction model are established based on the stress–strain curve. The result showed that the peak stress, critical stress and deformation activation energy (496.2 kJ mol−1) of the Ti-Zr steel containing 0.091 wt% Zr were higher than those of the steels with 0.035 and 0.073 wt% Zr. The increase of Zr content will increase the deformation activation energy of Ti-Zr steel and inhibit the growth of austenite DRX grains of Ti-Zr steel at high temperature. When the deformation conditions are the same, the DRX degree of austenite of Ti-Zr steel will first decrease and then increase with the increase of Zr content.
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