摘要
利用变形温度为1050～1200℃、应变速率为0.1～10s-1的恒温热压缩试验系统分析了Hastelloy G-3合金的高温变形特性及变形后的组织特征。对高应变速率下的流动应力进行变形热效应修正,建立了G-3合金热变形过程中峰值应力与变形温度、应变速率关系的本构模型。结果表明:所建立的本构模型在预测G-3合金热变形峰值应力时具有良好的精确度,能够满足工程应用的要求。G-3合金热加工过程的软化机制为动态再结晶,根据热变形后的组织特征确定G-3合金合理的热变形温度为1180～1200℃,应变速率为5～0s-1。
The hot deformation behavior and the subsequent microstructure characteristics of Hastelloy G-3 alloy were studied by isothermal compression tests at the strain rates of 0.1-10 s-1 and the temperatures of 1050-1200 oC. The flow-stress at high strain rates were corrected considering the effect of deformation heating, and a new constitutive relationship between peak stress and deformation temperature as well as strain rate for G-3 alloy at high temperature was established. The results show that the built material model has good fitting accuracy to satisfy the engineering need. The softening mechanism of G-3 alloy is dynamic recrystalization during hot working process. According to the microstructures after deformation, for G-3 alloy the proper deformation temperature is 1180-1200 oC and the proper strain rate is 5-10 s-1.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2011年第4期605-609,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金重点项目(50831008)
关键词
HASTELLOY
G-3合金
高温变形特性
温升效应
本构关系
组织特点
Hastelloy G-3 alloy
hot deformation behavior
effect of deformation heating
constitutive relationship
microstructure characteristics
