TC21钛合金热变形组织演变及本构关系研究

周爱美; 余新平; 潘巧玉; 徐海林; 董洪波

doi:10.15980/j.tzzz.2022.02.020

研究·合金工艺 | 浏览量 : 0 下载量: 144 CSCD: 0

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TC21钛合金热变形组织演变及本构关系研究
Microstructure Evolution and Constitutive Relationship of Hot Deformation TC21 Alloy
2022年42卷第2期页码：230-234
纸质出版日期： 2022 ，
DOI： 10.15980/j.tzzz.2022.02.020

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周爱美, 余新平, 潘巧玉, 等. TC21钛合金热变形组织演变及本构关系研究[J]. 特种铸造及有色合金杂志, 2022,42(2):230-234.

Zhou Aimei, Yu Xinping, Pang Qiaoyu, et al. Microstructure Evolution and Constitutive Relationship of Hot Deformation TC21 Alloy[J]. Special Casting & Nonferrous Alloys, 2022,42(2):230-234.
周爱美, 余新平, 潘巧玉, 等. TC21钛合金热变形组织演变及本构关系研究[J]. 特种铸造及有色合金杂志, 2022,42(2):230-234. DOI： 10.15980/j.tzzz.2022.02.020.

Zhou Aimei, Yu Xinping, Pang Qiaoyu, et al. Microstructure Evolution and Constitutive Relationship of Hot Deformation TC21 Alloy[J]. Special Casting & Nonferrous Alloys, 2022,42(2):230-234. DOI： 10.15980/j.tzzz.2022.02.020.

摘要

采用Gleeble-3500热模拟压缩机对TC21钛合金进行等温恒应变速率的热模拟压缩试验，研究其在变形温度为870～990℃和应变速率为0.001～10 s

-1

条件下的热变形行为。结果表明，当应变速率为0.1 s

-1

时，变形温度升高促进了动态再结晶发生，组织内α相晶粒逐渐被拉长并破碎，晶粒尺寸得到细化。当变形温度为870℃、应变速率为0.01 s

-1

时，组织中α相更细小均匀。通过分析热模拟试验数据，得到了TC21合金变形激活能Q

并建立了高温条件下的流变应力本构方程和再结晶动力学模型。此外，对再结晶动力学模型进行了误差分析，验证了模型的准确性。

Abstract

The Gleeble-3500 thermal simulation compressor was applied to conduct isothermal and constant strain rate thermal simulation compression tests

and the thermal deformation behavior of TC21 titanium alloy was investigated at deformation temperature of 870～990 ℃ and strain rate of 0.001～10 s

-1

. The results indicate that at the strain rate of 0.1 s

-1

the increase of deformation temperature promotes the dynamic recrystallization

and the α phase grains in the microstructure are gradually elongated and broken

refining the grain size. When the deformation temperature is 870 ℃ and the strain rate is 0.01 s

-1

the α phase grains in the microstructure are finer with more uniformly. Through the analysis and calculation of the thermal simulation experimental data

the deformation activation energy Q of TC21 alloy was obtained

and the flow stress constitutive equation and recrystallization kinetic model under high temperature condition were established. Finally

the error analysis of the recrystallization kinetics model was performed

verifying the accuracy of the model.