王晓溪,张翔,董兴兵,等.考虑摩擦效应的工业纯钛TA2热压缩变形本构方程及热加工图[J].精密成形工程,2022,14(6):71-77.
WANG Xiao-xi,ZHANG Xiang,DONG Xing-bing,et al.Investigation on Constitutive Equation and Hot Processing Map of Commercially Pure Titanium TA2 during Hot Compression Deformation Considering the Friction Effect[J].Journal of Netshape Forming Engineering,2022,14(6):71-77. |
| 考虑摩擦效应的工业纯钛TA2热压缩变形本构方程及热加工图 |
| Investigation on Constitutive Equation and Hot Processing Map of Commercially Pure Titanium TA2 during Hot Compression Deformation Considering the Friction Effect |
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| DOI：10.3969/j.issn.1674-6457.2022.06.010 |
| 中文关键词: 摩擦修正 工业纯钛TA2 热变形 本构方程 热加工图 |
| 英文关键词: friction correction commercially pure titanium TA2 hot deformation constitutive equation hot processing map |
| 基金项目:国家自然科学基金青年科学基金(51905462);江苏省自然科学基金面上项目(BK20201150);江苏省高等学校自然科学研究重大项目(21KJA460007);江苏省“六大人才高峰”高层次人才选拔培养资助项目(GDZB–127);江苏省“333高层次人才工程”培养资助项目(2022–3–12–182) |
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| 中文摘要: |
| 目的 研究工业纯钛TA2在变形温度为800~950 ℃、应变速率为0.001~1 s−1、压下量为50%条件下的热压缩变形行为，构建材料高温本构方程及热加工图。方法 利用Gleeble–3500热模拟试验机进行热压缩试验，对实测流变曲线进行摩擦修正，通过线性回归拟合等方法建立本构方程，基于动态材料模型构建工业纯钛TA2热加工图，确定材料最佳热变形区域。结果 工业纯钛TA2热变形激活能Q为473.491 kJ/mol，应力指数n为3.876 6;最佳热变形参数为变形温度850~950 ℃、应变速率0.02~0.35 s−1。结论 工业纯钛TA2摩擦修正后的流变应力值均低于实测值，流动应力随变形温度的升高和应变速率的减小而降低。所建立的Arrhenius本构模型可较为准确地描述工业纯钛高温流变行为。工业纯钛TA2在中高温中等应变速率条件下加工性能良好，该区域材料发生了动态再结晶组织转变。 |
| 英文摘要: |
| Hot compression deformation behavior of commercially pure titanium TA2 under the conditions of the deformation temperature of 800-950 ℃, the strain rate of 0.001-1 s−1 and the reduction of 50% was investigated to establish the high temperature constitutive equation and hot processing map of TA2. Hot compression tests of commercially pure titanium TA2 were performed with Gleeble-3500 thermal simulator under different deformation conditions. The friction correction were carried out for measured flow curves, the constitutive equation of TA2 was established by linear regression fitting, and the hot processing map of TA2 was constructed based on the dynamic material model to determine the optimal processing parameters. The results showed that the thermal deformation activation energy Q of TA2 was 473.491 kJ/mol and the stress index n was 3.876 6. The optimum thermal deformation parameters were the temperatures of 850-950 ℃ and the strain rate of 0.02-0.35 s−1. The flow stress decreases with increase of the deformation temperature and decrease of the strain rate. The friction-corrected flow stress is less than the measured value under the experimental conditions, and the Arrhenius-type hyperbolic sine equation can be used to more accurately describe the hot deformation behavior of commercially pure titanium at high temperature. The commercially pure titanium TA2 exhibits good workability under the conditions of medium-high temperature and medium strain rate, in which the dynamic recrystallization occurs during the hot deformation process. |
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