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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 deformation characteristics and deformation characteristics of Hastelloy G-3 alloy under high temperature were analyzed by the thermostatic thermo-compression test system with deformation temperature of 1050 ~ 1200 ℃ and strain rate of 0.1 ~ 10s-1. The deformation thermal effect of flow stress at high strain rate was corrected, and the constitutive model of the relationship between peak stress and deformation temperature and strain rate during the thermal deformation of G-3 alloy was established. The results show that the established constitutive model has good accuracy in predicting the peak stress of G-3 alloy during thermal deformation, and can meet the requirements of engineering application. The softening mechanism of G-3 alloy during hot working is dynamic recrystallization. According to the microstructure characteristics of G-3 alloy, the reasonable heat distortion temperature of G-3 alloy is 1180 ~ 1200 ℃ and the strain rate is 5 ~ 0s-1.