Hot Deformation Behavior of TC2 Titanium Alloy

doi:10.11901/1005.3093.2020.127

Chinese Journal of Materials Research

2020, Vol. 34

Issue (12): 892-904 DOI: 10.11901/1005.3093.2020.127

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Hot Deformation Behavior of TC2 Titanium Alloy

LI Muze¹^,², BAI Chunguang¹^,²(

), ZHANG Zhiqiang¹, ZHAO Jian¹, XU Dongsheng¹^,², WANG Yanfeng³

^1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^3.Chaoyang Jinda Titanium Co. , Ltd. , Chaoyang 122000, China

Cite this article:

LI Muze, BAI Chunguang, ZHANG Zhiqiang, ZHAO Jian, XU Dongsheng, WANG Yanfeng. Hot Deformation Behavior of TC2 Titanium Alloy. Chinese Journal of Materials Research, 2020, 34(12): 892-904.

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Abstract

The high temperature deformation behavior of TC2 Ti-alloy was investigated by means of finite element simulations and isothermal hot compression tests parallelly. Firstly, the characteristic stress-strain curves of TC2 were analyzed, and the high temperature constitutive equation and activation energy were acquired . Secondly, the microstructure evolution was observed with optical microscope. It was found that the globularization of α-phase is obvious at high temperature and low strain rate. Thirdly, the power dissipation and thermal processing map of TC2 Ti-alloy were drawn. And the deformation mechanism was characterized by strain rate sensitivity exponent m. Lastly, and the optimized processing window of TC2 Ti-alloy was determined as: (I) 760~825℃, 0.007~0.024 s^-1; (II) 850~900℃, 0.018~0.37 s^-1; and (III) 900~950℃, 1~10 s^-1. Within these ranges the power dissipation rate of TC2 Ti-alloy is significant and sufficient dynamic recrystallization occurs in the process of deformation.

Key words: metallic materials TC2 titanium alloy hot deformation processing map microstructural evolution

Received: 17 April 2020

ZTFLH:

TG146

Fund: National Key Research and Development Program of China (Nos. 2017YFB0306201 &;2016YFB0701303

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	Muze LI
	Chunguang BAI
	Zhiqiang ZHANG
	Jian ZHAO
	Dongsheng XU
	Yanfeng WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.127 OR https://www.cjmr.org/EN/Y2020/V34/I12/892

Fig.1 Original microstructure of experimental sample (a) cross section; (b) longitudinal section

Table 1 Chemical composition of TC2 titanium alloy used in experiments (%, mass fraction)

Fig.2 Process of the isothermal hot compression test

Fig.3 Temperature of samples measured during the compression test (a) 1 s^-1 and (b) 10 s^-1

Fig.4 Modified flow stress by linear interpolation (ε=0.4, $ε ˙$ =1 s^-1)

Fig.5 Comparison of the flow stress corrected by interpolation and equation (a) 700℃, 1 s^-1 and (b) 800℃, 1 s^-1

Fig.6 Results of the simulation using stress-strain curves corrected by different methods before modification (a) and after modification (b)

Fig.7 Flow stress curves of TC2 titanium alloy obtained at different strain rate with temperature of 700℃ (a), 750℃ (b), 800℃ (c), 850℃ (d), 900℃ (e) and 950℃ (f)

Fig.8 Flow stress curves of TC2 titanium alloy obtained at different temperature and strain rate of 0.01 s^-1 (a), 0.1 s^-1 (b), 1 s^-1 (c), and 10 s^-1 (d)

Fig.9 Results of strain distribution got from simulation and test at 700℃ and 0.1 s^-1

Fig.10 Microstructures at different areas at 700℃ and strain rate of 0.1 s^-1

Fig.11 Microstructures of samples at different temperature with strain rate of 1 s^-1 at 700℃ (a), 800℃ (b), and 900℃ (c)

Fig.12 Microstructures of samples at different strain rate with temperature of 750℃ (a) 0.01 s^-1, (b) 0.1 s^-1, (c) 1 s^-1, and (d) 10 s^-1

Fig.13 Relation curves of (a) $l n ε ˙$ - $l n σ$ , (b) $? l n ε ˙$ - $σ$ and (c) $? l n ε ˙$ - $l n s i n h α σ$

Fig.14 The relation curves of $l n s i n h α σ$ - $1000 T$

Fig.15 Relation curves of $l n Z$ - $l n s i n h α σ$

Fig.16 Comparison of calculated values and experimental values

Fig.17 m map of TC2 titanium alloy

Fig.18 Power dissipation map of TC2 titanium alloy

Fig.19 Processing map of TC2 titanium alloy

Fig.20 Effect of strain rate on the volume fraction of primary α phase

Fig.21 Effect of temperature on the volume fraction of primary α phase

Fig.22 Microstructure corresponding different area in the processing map of TC2 titanium alloy

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