中文摘要：

采用Gleeble-1500热模拟试验机对FGH96合金进行双道次变形量为45%＋25%的等温热压缩实验,研究了变形温度为1050~1125℃,变形速率为0.001~0.1 s-1的热变形行为和组织变化,建立了包含应变量、变形温度、变形速率的双道次热变形本构方程,结果表明：FGH96合金的第1道次和第2道次的压缩应力应变曲线有相同的变化规律,两道次流变应力均受到γ′溶解以及由此造成晶粒长大的影响;由本构方程计算的模拟值与实验实测值具有良好的拟合性,模拟值能真实地反映应力在不同变形条件下的变化规律;选择变形温度：1075~1100℃、变形速率：0.01~0.1 s-1时能获得理想的热变形组织。

英文摘要：

The hot deformation behavior and microstructure evolution of FGH96 superalloy has been investigated during two-pass hot deformation in the temperature range of 1050-1125 ℃ and the strain rate range of 0.001-0.1 s-l with the strain of 45%＋25% by an isothermal interrupted hot compression test via Gleeble-1500, A constitutive relationship including strain, strain rate and temperature was established, The results show that the first and the second pass hot deformations have the same change rules. The solution of y＇ and the growth of grain have an effect on both of the two pass hot deformations. The curves of true stress-true strain between mathematical model and measured values are preferably fitting. The mathematical model can reflect the flow stress precisely under different conditions. A better deformed microstructure can be achieved when the temperature is between 1075 and 1100 ℃, and the strain rate between 0.01 and 0.1 sl.