锻压技术

DP工艺GH4169合金新型高温本构模型及组织定量研究

英文标题：Research on new high temperature constitutive model and quantitative microstructure of delta-processed GH4169 alloy

作者：司家勇陈龙廖晓航李志

单位：中南林业科技大学

关键词：GH4169合金 DP工艺本构模型动态再结晶 δ相

分类号：TG113.2

出版年,卷(期):页码：2017,42(10):180-188

摘要：

通过高温热压缩试验，得到经DP工艺处理的GH4169合金在变形温度为900~1060 ℃、应变速率为0.001~0.5 s-1、压缩量为70%条件下的真应力-真应变曲线，依据流变曲线特征，界定出加工硬化-动态回复和动态流变软化两个阶段，建立了相应的新型高温流变本构模型，同时观察了变形显微组织，进行了定量金相统计分析。结果表明：GH4169合金高温压缩显微组织中的动态再结晶晶粒尺寸随变形温度的升高或应变速率的降低而逐渐增大；δ相含量逐渐减少，在1060 ℃时基本消失。通过引入标准统计参数——相关系数和平均相对误差绝对值，表明预测值和实际试验数值吻合度较高，所建立的本构方程可以用于准确预测经DP工艺处理的GH4169合金热成形过程中的应力值和热成形工艺优化。

The true stress-true strain curves of delta-processed GH4169 alloy with the deformation temperature of 900-1060 ℃, the strain rate of 0.001-0.5 s-1 and the compression amount of 70% were obtained by the high temperature hot compression tests. Then, the new high temperature constitutive models were established according to the characteristics of rheological curve to define two stages of the work hardening-dynamic recovery and dynamic rheological softening. Furthermore, the deformation microstructure was observed, and the quantitative metallographic analysis was carried out. The results show that the size of dynamic recrystallized grain increases gradually with the increasing of deformation temperature and the decreasing of strain rate. However, the content of δ phase gradually drops and almost disappears at 1060 ℃. Thus, the predicted values and actual test data are highly matched by introducing the standard statistical parameters of the correlation coefficient and the absolute value of average relative error, and the stress values of the delta-processed GH4169 alloy and optimized parameters in the hot forming process are accurately predicted by the new developed constitutive models.

基金项目：

湖南省教育厅重点项目（16A220）；湖南省自然科学基金面上项目（2017JJ2403）；湖南省高校科技创新团队支持计划（201485）

作者简介：司家勇 (1978-)，男，博士，副教授，E-mail：sjy98106@163.com

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