含Nb微合金钢动态再结晶行为研究

Dynamic recrystallization behavior of a Nb-microalloyed steel

采用Thermecmastor-Z热模拟机，研究Q345E钢的动态再结晶（DRX）行为。结果显示，动态再结晶在高变形温度和低应变速率下更易发生，回归法计算铌微合金钢在950～1100℃温度范围内的变形激活能和应力指数分别为379．29±23．56kJ／mol和5．76。建立了计算动态再结晶峰值应变半经验公式。

Using a Thermecmastor-Z hot simulator, dynamic recrystallization （DRX） behavior of a Nbmicroalloyed steel was investigated. The results show that DRX will more likely occur at higher deformation temperature and lower strain rate. The deformation activation energy and stress exponent for the Nb-microalloyed steel are calculated to be 379. 29 ± 23. 56 kJ/mol and 5. 76 in temperature range of 950 ℃ to 1 100 ℃ by regression analysis, respectively. Furthermore, a semi-empirical model is developed to identify the peak strain for DRX.