锻压技术

TC21钛合金热变形及动态再结晶行为

英文标题：Hot deformation and dynamic recrystallization behavior of TC21 titanium alloy

作者：姜玉强王敏博张翼飞郭彦伟黄志超

分类号：TG316

出版年,卷(期):页码：2024,49(12):180-187

摘要：

摘要：钛合金构件的服役性能受其微观组织的影响，而热成形工艺决定了合金的微观组织。为获得热成形工艺对钛合金高温变形及微观组织演变的影响机理，以损伤容限型TC21钛合金为研究对象，对其进行等温热压缩试验，变形温度为900和940 ℃，应变速率为0.001、0.01、0.1和1 s-1，压下量为60%。基于实验结果和动态再结晶理论，获得了该合金的高温变形规律，并通过构建动力学模型分析了动态再结晶的演变规律。结果表明：TC21钛合金的热变形行为受到变形温度和应变速率的双重影响，其动态再结晶过程符合Avrami动力学方程；在相同应变速率下，高变形温度时的动态再结晶速率更快，而在相同温度下，低应变速率则会使动态再结晶速率减小。

Abstract: The service performance of titanium alloy component is affected by its microstructure, and the microstructure of alloy is determined by the hot forming process. Therefore, in order to obtain the influence mechanisms of forming process on the high-temperature deformation and microstructure evolution of titanium alloy, for damage tolerant TC21 titanium alloy, the isothermal thermal compression tests were carried out at the deformation temperatures of 900 and 940 ℃, the strain rates of 0.001,0.01,0.1 and 1 s-1 and the reduction amount of 60%. Then, based on the experimental results and the dynamic recrystallization theory, the high-temperature deformation behaviors of the alloy were obtained, and the evolution laws of dynamic recrystallization were analyzed by constructing a dynamic model. The results show that the thermal deformation behavior of TC21 titanium alloy is influenced by both deformation temperature and strain rate, and its dynamic recrystallization process conforms to the Avrami kinetic equation. At the same strain rate, the dynamic recrystallization rate is faster at higher deformation temperature, while at the same temperature, the dynamic recrystallization rate is smaller at the lower strain rate.

基金项目：

基金项目:江西省自然科学基金资助项目（20232BAB204054）；江西省教育厅科技项目（GJJ210670）

作者简介：姜玉强（1987-），男，博士，讲师 E-mail：jiangyq2021@126.com 通信作者：黄志超（1971-），男，博士，教授 E-mail：hzcosu@163.com

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