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基于GH188合金高温拉伸和蠕变拉伸试验数据,建立了800℃高温蠕变本构方程;利用有限元软件ABAQUS建立分析模型,对双凸形构件的热蠕变成形过程进行数值模拟,分析了应力应变变化;同时,开展工艺验证试验。结果表明:蠕变应变计算值与试验值吻合较好,本构方程能够用来描述合金的高温蠕变变形;蠕变变形和应力松弛主要发生在成形的前期,优化双凸形构件的成形时间为2 h;构件曲率半径数值模拟结果与试验结果的相对误差低于15.2%,验证了有限元分析模型的合理性和有效性。
Based on the high temperature tensile and creep tensile test data of GH188 alloy, a creep constitutive equation was established at 800 ℃. The finite element software ABAQUS was used to establish the analytical model to simulate the thermal creep forming process of the biconvex component. The stress and strain changes; the same time, process validation test. The results show that the calculated value of creep strain agrees well with the experimental value. The constitutive equation can be used to describe the creep deformation of the alloy at high temperature. The creep deformation and stress relaxation mainly occur in the early stage of forming, and the forming time of the double convex component Is 2 h. The relative error between numerical simulation results and experimental results is less than 15.2%, which verifies the rationality and effectiveness of the finite element analysis model.