| Ti80钛合金两相区高温变形本构模型及热加工图 |
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| 引用本文： | 周晓锋,付文,利成宁,程方杰.Ti80钛合金两相区高温变形本构模型及热加工图[J].金属热处理,2022,47(5):25-30. |
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| 作者姓名： | 周晓锋 付文 利成宁 程方杰 |
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| 作者单位： | 1.天津大学 材料科学与工程学院, 天津 300350; 2.天津钢管制造有限公司, 天津 300301; 3.天津市现代连接技术重点实验室, 天津 300350 |
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| 基金项目： | 天津市科技计划(18ZXJMTG00140)； |
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| 摘 要： | 为了确定Ti80钛合金热变形的最佳工艺窗口,采用Gleeble3500热模拟试验机对Ti80钛合金进行了高温压缩试验,试验变形温度为850~1050 ℃,应变速率为0.05~1 s-1。结果表明,Ti80钛合金对变形温度和应变速率极其敏感,流变应力随着应变速率的增加和变形温度的降低而显著升高,近β区的流变应力分布会发生突变。应用线性回归方法,建立Ti80钛合金的高温本构方程,计算出Ti80钛合金在两相区的变形激活能为308 kJ/mol,并基于Prasad失稳准则,建立Ti80钛合金的热加工图,最终确定在变形温度为880~930 ℃的两相区变形条件下,Ti80钛合金在高应变速率下可以充分发生动态再结晶,从而获得理想的组织性能。
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| 关 键 词： | Ti80钛合金 变形温度 应变速率 本构模型 热加工图 |
| 收稿时间： | 2022-01-06 |
Constitutive model and hot processing map of Ti80 titanium alloy during high temperature deformation in two-phase region |
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| Zhou Xiaofeng,Fu Wen,Li Chengning,Cheng Fangjie.Constitutive model and hot processing map of Ti80 titanium alloy during high temperature deformation in two-phase region[J].Heat Treatment of Metals,2022,47(5):25-30. |
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| Authors: | Zhou Xiaofeng Fu Wen Li Chengning Cheng Fangjie |
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| Affiliation: | 1. School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China; 2. Tianjin Pipe Corporation, Tianjin 300301, China; 3. Tianjin Key Laboratory of Modern Connection Technology, Tianjin 300350, China |
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| Abstract: | In order to determine the best process window for hot deformation of Ti80 titanium alloy, high temperature compression test of Ti80 titanium alloy was carried out by Gleeble3500 thermal simulation test machine with deformation temperature between 850-1050 ℃, and the strain rate between 0.05-1 s-1. The results show that Ti80 titanium alloy is very sensitive to deformation temperature and strain rate, and the flow stress increases significantly with the increase of strain rate and the decrease of deformation temperature. In the near β region, the distribution of flow stress will change suddenly. The high temperature constitutive equation of the Ti80 titanium alloy is established by using the linear regression method. The deformation activation energy of the Ti80 titanium alloy in the two-phase region is calculated to be 308 kJ/mol. Based on the Prasad instability criterion, the hot processing map of the Ti80 titanium alloy is established. Finally, it is determined that the Ti80 titanium alloy can fully recrystallize at high strain rate when the deformation temperature is between 880-930 ℃, and then ideal microstructure and properties can be obtained. |
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| Keywords: | Ti80 titanium alloy deformation temperature strain rate constitutive equation hot processing map |
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