锻压技术

基于应变补偿的TC4钛合金双相区本构建模与微观组织演变

英文标题：Constitutive modeling and microstructure evolution of TC4 titanium alloy in dual-phase zone based on strain compensation

作者：李沛艾1 2 宋永强1 魏超2 张庆伟1

单位：1. 中际联合（北京）科技股份有限公司北京 101106 2. 北京理工大学机械与车辆学院北京 100081

关键词：TC4钛合金高温变形流变应力本构模型微观组织演变

分类号：TG115；TG146

出版年,卷(期):页码：2025,50(5):259-267

摘要：

基于变形温度为850~950 ℃和应变速率为0.01~10 s-1的等温压缩热模拟实验，研究了TC4钛合金在α+β双相区内的高温变形行为，建立了基于应变补偿的Arrhenius型本构模型用以描述TC4钛合金的流变行为。结果表明：随变形温度升高和应变速率减小，TC4钛合金的峰值应力减小；升高变形温度和增大变形速率时，α相的体积分数降低，但变形量对其影响不大;增大变形量会增加位错累积、提高畸变能，进而促使α晶粒发生动态再结晶;降低应变速率可以促进α晶粒动态再结晶的形成和发展。所构建的本构模型对流变应力的预测结果与实验结果接近，两者的线性相关系数为0.999，平均绝对误差为2.94%，证明该模型具有较高的预测精度。

Based on isothermal compression thermal-simulation experiments with the deformation temperature of 850-950 ℃ and the strain rate of 0.01-10 s-1, the high-temperature deformation behavior of TC4 titanium alloy in the α+β dual-phase region was studied, and an Arrhenius-type constitutive model based on strain compensation was established to describe the rheology behavior of TC4 titanium alloy. The results show that as the deformation temperature increases and the strain rate decreases, the peak stress of TC4 titanium alloy decreases. The volume fraction of α phase decreases with the increasing of deformation temperature and strain rate, while the deformation amount has an insignificant effect on it. Increasing the deformation amount could increase the accumulation of dislocations and the distortion energy, thereby promoting the dynamic recrystallization of α grains. Reducing the strain rate could promote the formation and development of dynamic recrystallization of α grains. The prediction results of the established constitutive model for rheological stress are close to the experimental results. The linear correlation coefficient between the two is 0.999, and the average absolute error is 2.94%, which indicates that the constitutive model has high prediction accuracy.

基金项目：

北京市自然科学基金资助项目（4242047）

作者简介：李沛艾（1988-），男，博士，工程师，E-mail：beibeipeipei@126.com

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