高锰TWIP钢热变形行为及应变补偿型本构方程的建立  

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

作　　者：陈勇 文光奇 张晓明[1] 丁桦 CHEN Yong;WEN Guang-qi;ZHANG Xiao-ming;DING Hua(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;School of Materials Science&Engineering,Northeastern University,Shenyang 110819,China;Key Laboratory of Lightweight Structural Materials,Liaoning Province,Shenyang 110819,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819 [2]东北大学材料科学与工程学院,辽宁沈阳110819 [3]辽宁省轻量化用关键金属结构材料制备重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2021年第3期325-332,共8页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51974084).

摘　　要：对高锰TWIP钢进行不同温度(850~1100℃)和应变速率(0.01,0.1,1,5,10 s-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 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 10 s-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.

关 键 词：高锰TWIP钢 热变形 流动特性 本构方程 应变补偿 

分 类 号：TG142.1[一般工业技术—材料科学与工程]