锻压技术

铸态GH706合金的热变形行为研究

英文标题：Study on hot deformation behavior of cast alloy GH706

作者：刘国伟赵兴东杨艳慧刘东

关键词：铸态GH706合金热模拟压缩试验流变曲线本构关系 Arrhenius模型 Voce方程

分类号：TG316

出版年,卷(期):页码：2015,40(9):117-124

摘要：

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 stress-strain curves of cast alloy GH706 were obtained based on the data of compression tests from thermo-simulation under the condition of temperatures 1100-1090 ℃ and strain rates 0.01-1 s-1, and the characteristics and cause of the stress-strain curves were analyzed. Compared with the forging material, cast material is easy to produce the work hardening at high strain rates. The linear regression analysis of experimental data was carried out by Arrhenius model, the constitutive equation of cast alloy GH706 under the strain range of 0.2-0.8 was established, and the maximum relative error between calculated value and experimental value is 13.1%. Furthermore, the constitutive equations of cast alloy GH706 at the strain range of 0-0.2 was built by Voce equation, the average relative error between calculated value and experimental value is 0.2%, which shows the work hardening behavior of cast alloy GH706 at the low strain rates well.

基金项目：

教育部高等学校博士学科点专项科研基金资助项目（20126102120022）

刘国伟（1988-）男，硕士研究生;通讯作者：刘东（1969-）男，博士，教授

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