锻压技术

真空固溶态FGH4096高温合金的热变形行为及本构模型

英文标题：Thermal deformation behavior and constitutive equation on superalloy FGH4096 in vacuum solid solution state

单位：1.中国机械总院集团北京机电研究所有限公司 2.中机真空科技（济南）有限公司

分类号：TG166.7

出版年,卷(期):页码：2023,48(5):306-313

摘要：

为了研究FGH4096高温合金经过真空固溶热处理后的热变形行为，通过Gleeble-3500热模拟试验机在变形温度为1020、1050、1080、1110和1140 ℃，应变速率为0.001、0.01、0.1和1 s-1，变形量为60%条件下进行等温恒应变速率热压缩试验，基于热压缩试验的真应力-真应变曲线，采用回归分析以及拟合多项式建立了具有应变补偿高温变形的Arrhenius本构方程。结果表明：随着变形温度升高至1080和1110 ℃，合金发生完全动态再结晶；在1080 ℃、0.001 s-1和1110 ℃、0.01 s-1条件下变形时，相同应变速率下变形温度较低时的再结晶晶粒尺寸有所粗化；合金的热变形激活能为902.049 kJ·mol-1。本构模型能够较好地预测合金在热变形过程中的流变行为，可以通过控制应变速率和变形温度来控制热加工过程的应力水平。

In order to study the thermal deformation behavior of superalloy FGH4096 after vacuum solution heat treatment, the isothermal constant strain rate thermal compression test was conducted by thermal simulation test machine Gleeble-3500 at the deformation temperatures of 1020, 1050, 1080, 1110 and 1140 ℃, the strain rates of 0.001, 0.01, 0.1 and 1 s-1, and the deformation amount of 60%, and based on the true stress-true strain curve of the thermal compression test, the Arrhenius constitutive equation with strain compensation for high temperature deformation was established by regression analysis and polynomial fitting. The results show that when the deformation temperature increases to 1080 and 1110 ℃, the alloy undergoes complete dynamic recrystallization. When the alloy is deformed at the condition of 1080 ℃, 0.001 s-1 and 1110 ℃, 0.01 s-1, the recrystallized grain size is coarsened at lower deformation temperatures under the same strain rate. The heat deformation activation energy of alloy is 902.049 kJ·mol-1. Thus, the constitutive model can accurately predict the rheological behavior of alloy during the thermal deformation process, and the stress level during thermal processing can be controlled by controlling the strain rate and the deformation temperature.

基金项目：

济南市2019年“5150创新团队项目”

作者简介：刘剑箫（1992-），女，硕士研究生 ,E-mail：woshiliujianxiao@126.com;通信作者：翟月雯（1982-），女，博士，研究员,E-mail：zhaiyuewen@163.com

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