Ti-6Al-4V钛合金热拉伸变形行为与本构方程  

Deformation behavior and constitutive equation of Ti-6Al-4V alloy during hot tension

作　　者：王耀奇[1] 白雪飘[1] 侯红亮[1] 

机构地区：[1]北京航空制造工程研究所,北京100024

出　　处：《塑性工程学报》2013年第5期82-86,共5页Journal of Plasticity Engineering

基　　金：国家973资助项目(2011CB012800);航空科学基金资助项目(2010076)

摘　　要：在变形温度600℃-800℃、应变速率0．01s-1～0．33s-1条件下进行热态单向拉伸试验，研究Ti-6Al-4V钛合金的变形行为，以及变形性能与变形温度、应变速率之间的关系。结果表明，Ti-6Al-4V钛合金在变形过程中呈现两种变形特征，即稳态形与软化形，且随着变形温度的升高、应变速率的降低，流动应力降低，而延伸率则升高；基于Hooke定律和Grosman方程建立的Ti-6Al-4V钛合金热态成形本构方程，在整个变形区间内可以很好的表征材料的变形行为。The hot tensile tests for Ti-6Al-4V alloy were carried out at elevated temperature and different strain rates. The tem- perature was 600℃-800℃, and the strain rate was 0.01s-1 -0.33s -1. The deformation behavior of Ti-6Al-4V alloy was stud- ied, and the relation between deformation properties and temperature, strain rate was also investigated. Results show that two deformation characteristic, steady state flow characteristic and softening flow characteristic, appear during Ti-6Al-4V alloy de- formation process, and with temperature increasing and strain rate decreasing, flow stress reduces, but elongation reverses. Based on Hooke law and Grosman equation, the constitutive equation of Ti-6Al-4V alloy forming at elevated temperature is devel- oped, which can characterize well deformation behavior of Ti-6Al-4V alloy during whole deformation region.

关 键 词：TI-6AL-4V钛合金 流动应力 本构方程 

分 类 号：TG146.23[一般工业技术—材料科学与工程]