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通过热模拟压缩试验,得到了温度为1100,1130,1160和1190℃、应变速率为0.01,0.1和1 s-1下的铸态GH706合金流变曲线,分析了流变曲线的特征及成因,并通过与锻态材料对比,得出铸态材料在高应变速率下更容易产生应变硬化的结论;应用Arrhenius模型对实验数据进行回归分析,建立了0.2~0.8应变范围内铸态GH706合金的本构关系,统计计算了模型预测的流动应力和实验值之间的最大相对误差为13.1%;应用Voce方程建立了铸态GH706合金应变0~0.2范围内的本构关系,模型预测流动应力和实验值之间的平均相对误差为0.2%,很好地反映了低应变条件下材料的硬化行为。
The rheological curves of as-cast GH706 alloy at temperatures of 1100, 1130, 1160 and 1190 ℃ and strain rates of 0.01, 0.1 and 1 s-1 were obtained by thermal simulation compression test. The characteristics and causes of the rheological curve were analyzed. And compared with the as-forged material, it is concluded that the as-cast material is more prone to strain hardening under high strain rate. The Arrhenius model is used to conduct regression analysis of the experimental data to establish the present as-cast GH706 alloy The maximum relative error between the predicted flow stress and the experimental data is 13.1%. The constitutive relation of the as-cast GH706 alloy in the strain range of 0 ~ 0.2 is established by Voce equation. The model predicts the flow stress and the experiment The average relative error between the values is 0.2%, which well reflects the hardening behavior of the material under low strain conditions.