摘要
采用Gleebe-1500热模拟机，对Zr-4合金在温度为750～950℃、应变速率为5×10^-5～50s^-1、最大变形程度为80%的条件下，进行高温压缩热模拟实验研究。在实验基础上，分析了合金高温变形时的变形激活能和应力指数以及流变应力与应变速率、变形温度之间的关系，以经典的双曲正弦式的模型为基础建立了Zr-4合金热变形的本构方程．同时也通过对数据回归处理确定了合金不同温度下的应力指数n、变形激活能Q、材料常数ln A以及α，β值。研究结果表明，应变速率和变形温度的变化强烈影响着合金流变应力的大小，流变应力随应变速率提高而增大，随变形温度升高而降低。
The hot simulation test of high temperature Compressive deformation of Zr-4 alloy was performed on Gleeble-1500 hot simulator over the range of deformation temperature from 750℃ to 950℃, strain rate from 5 ×10^-5 s^-1 to 50 s^-1, maximium deformation degree 80%. Stress exponent, deformation activation energy, the relationship between flow stress and deformation temperature as well as strain rate were analyzed on the basis of the experiment. The constitutive equation for hot deformation of Zr-4 alloy was obtained on the basis of hyperbolic sine form mode, and the material constants, including activation energy Q, stress exponent n and lnA, α,β were also obtained. The results show that flow stress is controlled by both strain rate and de formation temperature, the flow stress deercases with the increase o f temperature, while it increass with the inereasc o fstrain rate
出处
《热加工工艺》
CSCD
北大核心
2006年第21期1-4,共4页
Hot Working Technology
基金
国家重点自然科学基金资助项目（50434030）
