采用Gleeble-1500热模拟机对GH738镍基高温合金进行了高温热压缩变形实验,分析了该合金在初始晶粒不同的情况下,变形温度1000-1160℃,应变速率0.01-10 s-1,工程变形量15％-70％条件下流变应力的变化规律及晶粒组织演化规律；同时研究了变形温度1040-1120℃,应变速率0.1-10 s-1,变形量15％-50％,保温时间0-45 s条件下该合金的亚动态(静态)再结晶及保温温度980-1140℃,保温时间0-4 h条件下的晶粒长大行为.通过系统的物理热模拟实验,构建了GH738高温合金在热变形过程中的晶粒组织演化模型及应力-应变模型,所建立的GH738高温合金模型与实验结果相比均表现出较高的相关度.
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