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| TC4-DT钛合金高温热变形行为研究 | |
| 引用本文： | 王小芳,陈明和,陈伟,朱知寿.TC4-DT钛合金高温热变形行为研究[J].航空材料学报,2012,32(1):30-34. |
| 作者姓名： | 王小芳 陈明和 陈伟 朱知寿 |
| 作者单位： | 1. 南京航空航天大学机电学院,南京,210016 2. 苏州有色金属研究院,江苏苏州,215026 3. 北京航空材料研究院,北京,100095 |
| 基金项目： | 某重大型号钛合金工程技术研究 |
| 摘 要： | 利用Gleeble-3500型热模拟实验机,研究了TC4-DT损伤容限型钛合金在温度850℃～1000℃、应变速率0.01～10s-1、变形程度为40%～70%条件下的热变形行为,分析了该合金的流变应力行为及微观组织演变规律,并建立了本构关系模型。研究结果表明,TC4-DT合金在950℃以下的较低温度变形时应力软化现象非常明显,变形机制和热变形激活能不同于950℃以上的较高温度变形机制;在950℃以上高温度变形时,低应变速率(如ε=0.01s-1)促进了动态再结晶行为的发生,而在较高的应变速率(如ε=10s-1)时,一般只发生动态回复现象,动态再结晶行为受抑制。 |
| 关 键 词： | TC4-DT钛合金 高温锻造 动态再结晶 微观组织 |
Study on Hot Deformation Behavior of TC4-DT Titanium Alloy |
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| WANG Xiao-fang , CHEN Ming-he , CHEN Wei , ZHU Zhi-shou.Study on Hot Deformation Behavior of TC4-DT Titanium Alloy[J].Journal of Aeronautical Materials,2012,32(1):30-34. | |
| Authors: | WANG Xiao-fang CHEN Ming-he CHEN Wei ZHU Zhi-shou |
| Institution: | 1.College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 2160016,China;2.Suzhou Institute of Nonferrous Metals Corp,Suzhou 215026,China;3.Beijing Institwte of Aeronautical Materials,Beijing 100095,China) |
| Abstract: | Hot compressive deformation of TC4-DT titanium alloy was carried out with the hot-simulation machine of Gleeble-3500 over the range of deformation temperature from 850 ℃ to 1000℃,strain rate from 0.01s-1 to 10s-1,and the deformation from 40% to 70%.The deformation behavior and microstructure have been analyzed;meanwhile the constitutive model has been set up.The results reveal that TC4-DT alloy deforms at temperatures below 950 ℃ when the stress softening phenomenon is very obvious,the deformation mechanisms and deformation activation energy are different from the deformation mechanism above the temperture of 950 ℃.When the alloy deforms at temperatures above 950 ℃,low strain rates(such as=0.01s-1) contribute to the occurrence of dynamic recrystallization behavior,while at higher strain rates(such as =10s-1),only the phenomenon of dynamicrecovery generally occurs.The dynamic recrystallization is inhibited. |
| Keywords: | TC4-DT titanium alloy high temperature forging dynamic recrystallization microstructure |
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