摘要
本工作对等轴细晶TC4钛合金进行了热压缩实验,研究了变形温度为800~950℃、应变速率为0.01~10 s^(-1)下TC4钛合金的变形行为,并建立相应的Arrhenius型本构方程和热加工图,再基于实验获得的真应力应变曲线对本构方程进行应变补偿修正。结果表明:合金的真应力值随温度升高、应变速率下降而减小;修正后本构方程真应力预测值与实验值相关系数R为0.985,相对误差ARRE为6.8%。结合热加工图和相应区域的电子背散射衍射(EBSD)分析可知:失稳区的温度为875~950℃,应变速率为0.3~10 s^(-1),组织特征表现为长条状晶粒;最适宜加工区的温度为800~875℃,应变速率为0.01~0.3 s^(-1),组织特征表现为等轴细晶。
The deformation behavior of equiaxed fine grain TC4 alloy under deformation temperature of 800—950℃and strain rate of 0.01—10 s^(-1)was studied by hot compression experiment,and the Arrhenius constitutive equation and hot processing map were established.Based on the true stress-strain curves obtained by experiment,the strain compensation is modified to the constitutive equation.The results show that the true stress decreases with the increase of temperature and the decrease of strain rate.The correlation coefficient between the predicted true stress and the experimental value R is 0.985,and the relative error ARRE is 6.8%.Combined with the hot processing map and the electron backscatter diffraction(EBSD)analysis of the corresponding region,it can be seen that the temperature in the instability zone is between 875—950℃,the strain rate is between 0.3—10 s^(-1),and the microstructure features are long strip grains.The optimum temperature in the processing area is between 800—875℃,the strain rate is between 0.01—0.3 s^(-1),and the microstructure is equiaxed fine grain.
作者
易宗鑫
李小强
潘存良
沈正章
YI Zongxin;LI Xiaoqiang;PAN Cunliang;SHEN Zhengzhang(National Engineering Research Center for Near-Net-Shape for Metallic Materials,South China University of Technology,Guangzhou 510640,China;Aerospace Research Institute of Materials&Processing Technology,Beijing 100076,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第18期18146-18152,共7页
Materials Reports
基金
国防基础科研计划项目(JCKY2018203C031)。
关键词
等轴细晶
TC4钛合金
本构方程
应变补偿修正
热加工图
equiaxed fine grain
TC4 titanium alloy
constitutive equation
strain compensation correction
hot processing map
