高锰TWIP钢热变形行为及应变补偿型本构方程的建立

对高锰TWIP钢进行不同温度(850~1100℃)和应变速率(0.01，0.1，1，5，10s^-1)的绝热压缩试验，研究试验钢高温热变形行为. 分析了变形温度和应变速率对流动特性的影响，建立了应变补偿型本构方程，并采用三种标准统计参数对应变补偿型本构方程的精确度进行了评估. 结果表明:流动应力对变形温度和应变速率的敏感程度很高，且随着变形温度的提高或应变速率的降低，流动应力呈下降趋势;应变速率对动态再结晶过程有着很复杂的影响;流动应力预测值与试验值具有较高的吻合度，表明建立的应变补偿型本构方程能够精确预测流动应力.

Hot Deformation Behavior of a High-Mn TWIP Steel and Establishment of Strain-Compensated Constitutive Equation

Hot deformation behaviors of a high-Mn twinning induced plasticity (TWIP) steel were investigated using isothermal hot compression tests at different temperature ranging from 850℃ to 1100℃ and constant strain rates of 0.01， 0.1， 1， 5 and 10s^-1， respectively. The effects of deformation temperature and strain rate on flow behavior were analyzed. A developed constitutive equation considering the strain compensation was established and its accuracy was evaluated based on three standard statistical parameters. The results indicate that the flow stress is strongly sensitive to deformation temperature and strain rate， which decreases with the increase in temperature or the decrease in strain rate. Strain rate has a complex influence on the kinetics of dynamic recrystallization. Since the predicted flow stress is in good agreement with the experimental one， it proves that the strain-compensated constitutive equation can estimate the flow stress accurately.