工业纯钛TA2热变形过程的流变行为本构方程
Constitutive equation for flow behavior of commercially pure titanium TA2 during hot deformation
柴希阳 1高志玉 2潘涛 3柴锋 3杨志刚 4杨才福3
作者信息
- 1. 钢铁研究总院工程用钢研究所, 北京100081;清华大学材料科学与工程学院, 北京100084
- 2. 钢铁研究总院工程用钢研究所, 北京100081;辽宁工程技术大学材料科学与工程学院,阜新123099
- 3. 钢铁研究总院工程用钢研究所, 北京100081
- 4. 清华大学材料科学与工程学院, 北京100084
- 折叠
摘要
利用Gleeble-3800热模拟实验机研究了工业纯钛TA2的热变形行为.变形温度为750～1000℃,步长50℃,应变速率分别为0.01、0.1、1和10 s-1.实验结果表明,TA2在热压缩变形过程中发生了加工硬化以及动态回复、动态再结晶.随着变形温度的降低和应变速率的增加,流变应力逐渐增加.为了准确预测TA2的高温流变行为,基于实验数据和双曲正弦Arrhe-nius模型构建了考虑应变影响的本构方程,本构方程中材料常数α、n、Q、lnA与应变之间存在6阶多项式关系.本文所提出考虑应变影响的本构方程可以用于研究工业纯钛TA2的高温流变行为.
Abstract
The hot deformation behavior of TA2, which is commercially pure titanium, was investigated using a Gleeble-3800 simulator over temperature and strain ranges of 750-1000℃ and 0. 01-10 s-1 , respectively. The results show that during hot compres-sive deformation, work hardening, dynamic recovery, and dynamic recrystallization occur. The flow stress increases as temperature de-creases and strain rate increases. To accurately predict the flow behavior for the alloy, constitutive equations considering the effect of strain were derived based on the obtained experimental data and a hyperbolic sine Arrhenius-type model. The material constantsα, n, Q, and lnA were found to be functions of strain and could be fitted by employing a sixth-order polynomial. Subsequently, the developed constitutive model can be employed to describe the deformation behavior of commercially pure titanium TA2.
关键词
工业纯钛/热变形/本构方程/应变Key words
commercially pure titanium/hot deformation/constitutive equations/strain引用本文复制引用
基金项目
国家国际科技合作专项资助项目(2015DFR50320)
国家高技术研究发展计划资助项目(2015AA03A501)
出版年
2018
国家科技期刊平台
NSTL
维普
万方数据