Transactions of Materials and Heat Treatment

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

Authors： Li Peiai1 2 Song Yongqiang1 Wei Chao2 Zhang Qingwei1

Unit： 1. Ficont Industry (Beijing) Co. Ltd. Beijing 101106 China 2. School of Mechanical Engineering Beijing Institute of Technology Beijing 100081 China

KeyWords： TC4 titanium alloy high-temperature deformation rheological stress constitutive model microstructure evolution

ClassificationCode：TG115；TG146

year,vol(issue):pagenumber：2025,50(5):259-267

Abstract：

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.

Funds：

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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