Kinetics of Dynamic Recrystallization of TB6 Ti-Alloy During Hot Compressive Deformation atTemperatures of β-phase Range

doi:10.11901/1005.3093.2019.329

Chinese Journal of Materials Research

2019, Vol. 33

Issue (12): 918-926 DOI: 10.11901/1005.3093.2019.329

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Kinetics of Dynamic Recrystallization of TB6 Ti-Alloy During Hot Compressive Deformation atTemperatures of β-phase Range

Delai OUYANG¹,Shiqiang LU¹,Xia CUI¹(

),Yong XU¹,Haiming DU²,Huian ZHU¹

1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
2. Jiangxi Normal University, Nanchang 330022, China

Cite this article:

Delai OUYANG,Shiqiang LU,Xia CUI,Yong XU,Haiming DU,Huian ZHU. Kinetics of Dynamic Recrystallization of TB6 Ti-Alloy During Hot Compressive Deformation atTemperatures of β-phase Range. Chinese Journal of Materials Research, 2019, 33(12): 918-926.

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Abstract

Hot compression tests of as-forged Ti-alloy TB6 were conducted via thermecmaster-Z hot simulation test machine through rapid heating the alloy up to the temperature range for the presence of β-phase and then compression tests by strain rates of 0.001~1 s^-1 at temperatures in the range of 825~1100℃, while the dynamic recrystallization (DRX) volume fraction were acquired by processing the collected rheological data during compression deformation with work hardening rate approach, then the kinetics of DRX of the alloy deformed at β-phase temperature was studied. The results show that the stress increases with the decrease of deformation temperature or the increase of strain rate, and the stress-strain curves present the type of DRX. With the decrease of strain rate and the increase of deformation temperature, the DRX volume fraction and the grain size of dynamic recrystallization increase. The DRX grain coarsening is observed for the alloy deformed at temperatures above 950℃ and strain rates below 0.001 s^-1. The DRX kinetics curves possess three typical stages: slow increase-fast increase-slow increase, showing a typical "S" type characteristic. Furthermore, the strain corresponding to the presence of 50% DRX volume fraction was determined and the relevant DRX kinetics model of TB6 Ti-alloy is established.

Key words: metallic materials TB6 titanium alloy work hardening rate DRX Kinetics

Received: 04 July 2019

ZTFLH:

TG 146.4

Fund: National Natural Science Foundation of China(51761029);National Natural Science Foundation of China(51864035)

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	Delai OUYANG
	Shiqiang LU
	Xia CUI
	Yong XU
	Haiming DU
	Huian ZHU

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.329 OR https://www.cjmr.org/EN/Y2019/V33/I12/918

Fig.1 Microstructure of TB6 titanium alloy

Fig.2 True stress-true strain cures of TB6 alloy deformed at different deformation conditions

Fig.3 Optical micrographs of specimens hot compressed with strain of 1.61: (a) 825℃,0.001 s^-1; (b) 825℃, 0.01 s^-1; (c) 825℃,0.1 s^-1; (d) 825℃, 1 s^-1; (e) 950℃, 0.001 s^-1; (f) 1100℃, 0.001 s^-1

Fig.4 Schematic diagram of stress-strain curves for dynamic recrystallization and virtual dynamic recovery

Fig.5 Schematic diagram of work hardening rate curve

Fig.6 Stress-strain curves (1-True curve, 2-Fitting curve) (a) and θ~σ curve (1-True curve, 2-Extrapolation curve) (b) of TB6 titanium alloy at deformation temperature 825℃ and strain rate 0.001 s^-1

Fig.7 Stress-strain curves (1- Fitting curve, 2-Virtual dynamic recovery curve) (a) and DRX kinetics curve (b) of TB6 titanium alloy at deformation temperature 825℃ and strain rate 0.001 s^-1

Fig.8 Stress-strain curves (1-True curve, 2-Fitting curve, 3-Virtual dynamic recovery curve)of TB6 titanium alloy at strain rate 0.001 s^-1 and different deformation temperatures (a) 825℃, (b) 875℃, (c) 950℃, (d) 1100℃

Fig.9 θ-σ curves (1-True curve, 2-Extrapolation curve) of TB6 titanium alloy at strain rate 0.001 s^-1 and different deformation temperatures (a)825℃, (b) 875℃, (c) 950℃, (d) 1100℃

Fig.10 DRX kinetics curves of TB6 titanium alloy at strain rate 0.001 s^-1

Fig.11 DRX kinetics curves of TB6 titanium alloy at different deformation conditions

Fig.12 DRX kinetics curve of TB6 titanium alloy at deformation temperature 825℃ and strain rate 0.01 s^-1

Fig.13 ε_0.5value of TB6 titanium alloy at different deformation conditions

Fig.14 Relation of ln[-ln(1-X_dRX)] and ln[(ε-ε_c)/ε_0.5]

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