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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—120℃,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.
The high temperature hot compression deformation of GH738 nickel base superalloy was carried out by using Gleeble-1500 thermal simulator. The deformation temperature was 1000-1160 ℃ and the strain rate was 0.01-10 s ~ (- 1), the law of rheological stress and the evolution law of grain structure under the condition of 15% -70% of the engineering deformation. The deformation temperature of 1040-120 ℃, the strain rate of 0.1-10 s ~ (-1) and the deformation of 15 % -50%, holding time of 0-45 s, the dynamic and static recrystallization of the alloy and the grain growth behavior under the conditions of holding temperature 980-1140 ℃, holding time 0-4 h, Thermal simulation experiment was carried out to construct the grain-structure evolution model and stress-strain model of GH738 superalloy during hot deformation. The GH738 superalloy model has a higher correlation with the experimental results.