粉体成型Zr-2合金热变形行为及本构模型研究
Hot Deformation Behavior and Constitutive Model of Powder Forming Zr-2 Alloy
蒋文龙 1吴裕 1周丹晴 1苏晓峰 1张弛 2张宏智1
作者信息
- 1. 中国核动力研究设计院 反应堆燃料及材料重点实验室,四川 成都 610213
- 2. 大连理工大学 材料科学与工程学院,辽宁 大连 116024
- 折叠
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(5 s-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.
Abstract
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.
关键词
Zr-2合金/粉体成型/热变形行为/本构模型Key words
Zr-2 alloy/powder forming/hot deformation behavior/constitutive model引用本文复制引用
出版年
2024
NETL
NSTL
万方数据