Hot Deformation Behavior of TC4 Ti-Alloy Prepared by Electron Beam Cold Hearth Melting

doi:10.11901/1005.3093.2020.103

Chinese Journal of Materials Research

2020, Vol. 34

Issue (9): 665-673 DOI: 10.11901/1005.3093.2020.103

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Hot Deformation Behavior of TC4 Ti-Alloy Prepared by Electron Beam Cold Hearth Melting

WANG Wei¹^,²(

), GONG Penghui¹, ZHANG Haoze²^,³, SHI Yaming², WANG Meng¹, ZHANG Xiaofeng², WANG Kuaishe¹

1. School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
2. Yunnan Titanium Industry Co., Ltd, Chuxiong 651209, China
3. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

Cite this article:

WANG Wei, GONG Penghui, ZHANG Haoze, SHI Yaming, WANG Meng, ZHANG Xiaofeng, WANG Kuaishe. Hot Deformation Behavior of TC4 Ti-Alloy Prepared by Electron Beam Cold Hearth Melting. Chinese Journal of Materials Research, 2020, 34(9): 665-673.

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Abstract

The hot deformation behavior of electron beam cold hearth melting TC4 Ti-alloy at 850~1100℃, by strain rate 0.01~10 s^-1 were investigated through a series of thermal simulation compression experiments via Gleeble-3800 thermal simulator. According to the true stress-true strain curve, the influence of deformation parameters on rheological stress was analyzed, and the Arrhenius constitutive model and DMM processing maps was established. The results show that the flow stress decreases with the increase of deformation temperature, and the flow stress decreases with the increase of strain rate. The hot deformation activation energy was Q=746.334 kJ/mol and Q=177.841 kJ/mol for the TC4 Ti-alloys composed of (α+β) two-phase and β phase respectively. The error analysis of the model was carried out by correlation coefficient method and relative average error. The correlation coefficient R²=0.995 and the relative average error AARE=5.04%, which indicates that the established model is accurate and can accurately predict the thermal deformation flow stress. The best processing area of the alloy is within the temperature range of 1000~1100℃ and strain rate range of 0.01~0.1 s^-1.

Key words: metallic materials Electron Beam Cold Hearth Melting TC4 hot deformation constitutive model processing maps

Received: 07 April 2020

ZTFLH:

TG146.2

Fund: China Postdoctoral Science Foundation(2019M653571)

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	Wei WANG
	Penghui GONG
	Haoze ZHANG
	Yaming SHI
	Meng WANG
	Xiaofeng ZHANG
	Kuaishe WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.103 OR https://www.cjmr.org/EN/Y2020/V34/I9/665

Fig.1 Macroscopic structure (a) and original structure (b) of TC4钛合金

Fig.2 True stress and true strain curves (a) 850℃, (b) 900℃, (c) 950℃, (d) 1000℃, (e) 1050℃, (f) 1100℃

Fig.3 Dependence of peak stress on temperature and strain rate (a) T- $σ$ , (b) $l n ε ˙ - σ$

Fig.4 Relationship between (a) lnσ- $l n ε ˙$ , (b) σ- $l n ε ˙$

Fig.5 Relationship between ln[sinh(ασ)] and $l n ε ˙$

Fig.6 Relationship between hot compression deformation peak stress and deformation temperature

Fig.7 Relationship between ln[sinh(ασ)] and lnZ

Fig.8 Correlation between the experimental and predicted flow stress data by the constitutive equation

Fig.9 Processing maps for primary rolling of TC4 titanium alloy by EBCHM

Fig.10 Microstructures of TC4 titanium alloy under different deformation (a) 850℃, 0.1 s^-1; (b) 850℃, 1.0 s^-1; (c) 950℃, 1.0 s^-1(d) 1100℃, 0.01 s^-1

Fig.11 Macro photos and microstructures of the specimens under 950℃、10 s^-1

Table 1 Activation energy of TC4 titanium alloy by EBCHM and VAR

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