Thermodynamical Explanation for Abnormal Dynamic Softening Rate of Ti-62A Alloy and Constitutive Equation of Strain Compensation

doi:10.11901/1005.3093.2019.541

Chinese Journal of Materials Research

2020, Vol. 34

Issue (6): 401-409 DOI: 10.11901/1005.3093.2019.541

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Thermodynamical Explanation for Abnormal Dynamic Softening Rate of Ti-62A Alloy and Constitutive Equation of Strain Compensation

WANG Jingzhong¹^,²(

), DING Kailun¹, YANG Xirong¹^,², LIU Xiaoyan¹^,²

1.College of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi’an 710055, China
2.Shaanxi Metallurgical Engineering Technology Research Center, Xi'an University of Architecture and Technology, Xi'an 710055，China

Cite this article:

WANG Jingzhong, DING Kailun, YANG Xirong, LIU Xiaoyan. Thermodynamical Explanation for Abnormal Dynamic Softening Rate of Ti-62A Alloy and Constitutive Equation of Strain Compensation. Chinese Journal of Materials Research, 2020, 34(6): 401-409.

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Abstract

The hot compression deformation behavior of Ti-62A alloy was investigated via Gleeble-3800 thermal simulator by strain rate of 0.001~10 s^-1 at 800~950℃. The results show that the dynamic softening rate of Ti-62A alloy decreased with the increase of deformation temperature. This phenomenon existed in the thermal processing of other biphasic titanium alloy, α-titanium alloy and β-titanium alloy. According to the thermodynamic calculation results by Jmatpro software, the phenomenon of (α+β) biphasic titanium alloy is closely related to the decrease of the atomic activity of the main alloy elements Mo, Cr and other β stable elements with the increase of temperature and the increase of β phase ratio. The reason for the decrease of dynamic softening rate of α-titanium alloy and β-titanium alloy is more closely related to the increase of the β phase ratio with the increase of processing temperature. When the temperature rose from 800℃ to 950℃, the proportion of β phase in Ti-62A alloy increased from 32.1% to 84.3%, and the activity of Mo and Cr decreased by 64%, which thereby results in the decrease of grain boundary migration rate and dynamic softening rate of Ti-62A alloy. The true stress-strain curve at 950℃ is mostly a typical dynamic recovery type. The content of α phase decreases with the increase of deformation temperature, and the β grain size is relatively large at higher deformation temperature. The Arrhenius deformation resistance model of Ti-62A alloy was constructed based on strain compensation, with which the rheological stress behavior of Ti-62A alloy can be predicted well, correspondingly, the correlation coefficient R is 0.990, and the average relative error between the predicted value and the measured value is 8.983%.

Key words: metallic materials Ti-62A alloy hot compression activity calculation of alloying elements microstructure constitutive equation of strain compensation

Received: 18 November 2019

ZTFLH:

TG146.2+3

Fund: National Natural Science Foundation of China(51474170)

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	Jingzhong WANG
	Kailun DING
	Xirong YANG
	Xiaoyan LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.541 OR https://www.cjmr.org/EN/Y2020/V34/I6/401

Table 1 Chemical composition of Ti-62A titanium alloy (mass fraction， %)

Fig.1 Micrograph of the as received Ti-62A alloy

Fig.2 Flow stress curves of Ti-62A alloy under different deformation conditions (a) 0.001 s^-1; (b) 0.01 s^-1; (c) 0.1 s^-1; (d) 1 s^-1; (e) 10 s^-1

Fig.3 Change of alloy element activity with temperature in titanium alloy (a) Ti-62A alloy; (b) TC11 alloy; (c) Commercially pure titanium; (d) TB17 alloy

Fig.4 Change of the ratio of α phase and β phase with temperature in titanium alloy (a) Ti-62A alloy; (b) Commercially pure titanium; (c) TB17 alloy

Fig.5 Microstructure of Ti-62A alloy deformed by hot compression at different temperatures with strain rate of 0.001 s^-1 (a) 800℃, (b) 850℃, (c) 900℃, (d) 950℃

Fig.6 Microstructure of Ti-62A alloy deformed by hot compression at different temperatures with strain rate of 1 s^-1(a) 800℃, (b) 850℃, (c) 900℃, (d) 950℃

Table 2 Constant fitting parameters of Ti-62A alloy

Fig.7 Comparison of the flow stress curves simulated with strain-compensated constitutive equations and experimental flow stress curves (a) 0.001 s^-1; (b) 1 s^-1

Fig.8 Correlation between calculated value of strain compensation equation and measured value of flow stress in Ti-62A alloy

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