利用变形温度为1050~1200℃、应变速率为0.1~10 s-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5~10 s-1.
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