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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。
The Gleeble-1500 thermal simulator was used to test the isothermal hot compression of FGH96 alloy with 45% + 25% double pass deformation. The deformation temperature was from 1050 ℃ to 1125 ℃ and the deformation rate was from 0.001 to 0.1 s-1 The results show that the compressive stress-strain curves of the first pass and the second pass of FGH96 alloy are the same The results show that the flow stress of two passes is affected by γ ’dissolution and grain growth. The simulated values calculated by the constitutive equation have a good fit with the experimental values. The simulated values can be truly The variation of stress under different deformation conditions was reflected. The ideal deformation was obtained when the deformation temperature was 1075 ~ 1100 ℃ and the deformation rate was 0.01 ~ 0.1 s-1.