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.
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 compressive deformation,work hardening,dynamic recovery,and dynamic recrystallization occur. The flow stress increases as temperature decreases 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 constants α,n,Q,and ln A 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.
作者
柴希阳
高志玉
潘涛
柴锋
杨志刚
杨才福
CHAI Xi-yang;GAO Zhi-yu;PAN Tao;CHAI Feng;YANG Zhi-gang;YANG Cai-fu(Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China;School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;School of Materials Science and Engineering, Liaoning Technical University, Fuxin 123099, China)
出处
《工程科学学报》
EI
CSCD
北大核心
2018年第2期226-232,共7页
Chinese Journal of Engineering
基金
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)
关键词
工业纯钛
热变形
本构方程
应变
commercially pure titanium
hot deformation
constitutive equations
strain
