摘要
采用Gleeble-1500型热模拟试验机对粉体成型Zr-2合金进行等温恒应变速率热压缩实验,研究其在热变形温度650~850℃,应变速率0.001~5 s^(-1)条件下的热变形行为。基于热压缩实验数据,采用基于应变修正的Arrhenius方程构建了粉体成型Zr-2合金的变形本构模型。研究结果表明:变形温度对粉体成型Zr-2合金的流变应力影响明显,随着变形温度的增加,材料的流变应力大幅度降低。同时,粉体成型Zr-2合金的热变形流变应力表现出对应变速率敏感的特征,即变形抗力随着应变速率的上升而增加,但在低温(650、700℃)、高应变速率(5s-1)条件下变形抗力增加并不明显。基于应变修正的Arrhenius方程构建的粉体成型Zr-2合金的本构方程,其相关系数为0.9827,可以较为准确地预测该材料的流变应力。
The hot compression experiments of powder forming Zr-2 alloy at the temperature of 650-850℃and the strain rate of 0.001-5 s-1 were carried out by Gleeble-1500 thermal simulation machine to study its hot deformation behavior.Based on the experimental data of hot compression,the strain modified Arrhenius equation was used to construct the deformation constitutive model of powder forming Zr-2 alloy.The results show that the deformation temperature has an obvious effect on the flow stress of powder forming Zr-2 alloy,and the flow stress of material decreases greatly with the increases of deformation temperature.At the same time,the thermal deformation flow stress of powder forming Zr-2 alloy is sensitive to strain rate,that is,the deformation resistance increases with the increase of strain rate,but the deformation resistance does not increase significantly at low temperature(650,700℃)and high strain rate(5 s-1).The constitutive equation of powder forming Zr-2 alloy based on the strain-modified Arrhenius equation has a correlation coefficient of 0.9827,which can predict the flow stress of the material accurately.
作者
蒋文龙
吴裕
周丹晴
苏晓峰
张弛
张宏智
Jiang Wenlong;Wu Yu;Zhou Danqing;Su Xiaofeng;Zhang Chi;Zhang Hongzhi(Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Chengdu 610213,China;School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《钛工业进展》
CAS
2024年第3期35-40,共6页
Titanium Industry Progress
关键词
Zr-2合金
粉体成型
热变形行为
本构模型
Zr-2 alloy
powder forming
hot deformation behavior
constitutive model
