摘要
在Gleeble-1500热模拟机上进行GH4049合金的热压缩实验，获得合金在温度为1090～1180℃、应变速率为0．1~50s-1条件下的应力一应变曲线。对峰值应力进行线性回归获得合金在不同变形条件下的材料常数，通过非线性回归建立合金的热变形本构方程。结果表明：随着变形温度升高，动态再结晶更加充分，晶粒尺寸变大；随着应变速率增加，晶粒组织趋于均匀，晶粒尺寸先减小后增大。
The GH4049 alloy's true stress-strain curves were constructed by data from the hot compression test carried out by thermal mechanical simulator of Gleeble-1500 in the temperature of 1090-1180 at strain rates of 0.1-50 s-1. The material constants of the alloy in different deformation conditions were obtained by the linear regression of peak stress, and constitutive equation of GH4049 alloy was established through non-linear regression. The results show that, as deformation temperature increases, microstructure had a more full dynamic recrystallization and grains size increases; as the strain rate increases, the grains are more uniform and grains size first decreases and then increases.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2014年第12期55-59,共5页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(51101119)
中国博士后科学基金资助项目(2012T50818)
关键词
GH4049合金
热变形本构方程
微观组织
Alloys
Compression testing
Constitutive equations
Crystal microstructure
Deformation
Dynamic recrystallization
Microstructure
Stress
strain curves
Stresses
