Effects of Heat Treatment on Microstructure, Texture and Tensile Properties of Ti65 Alloy

doi:10.11901/1005.3093.2019.110

Chinese Journal of Materials Research

2019, Vol. 33

Issue (10): 785-793 DOI: 10.11901/1005.3093.2019.110

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Effects of Heat Treatment on Microstructure, Texture and Tensile Properties of Ti65 Alloy

WU Xiyue^1,²,CHEN Zhiyong^1,²(

),CHENG Chao^1,²,LIU Jianrong^1,²,XU Dongsheng^1,²,WANG Qingjiang^1,²

1. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

WU Xiyue,CHEN Zhiyong,CHENG Chao,LIU Jianrong,XU Dongsheng,WANG Qingjiang. Effects of Heat Treatment on Microstructure, Texture and Tensile Properties of Ti65 Alloy. Chinese Journal of Materials Research, 2019, 33(10): 785-793.

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Abstract

Microstructure- and texture-evolution of Ti65 Ti-alloy plate were investigated, and the tensile deformation mechanism of the plate after heat treatment with different texture were discussed. The results show that heat treatment has a significant influence on the evolution of microstructure and texture of the plate. Equiaxed-, duplex- and lamellar-microstructure would be obtained after different heat treatment. The plate with equiaxed microstructure presented a B/T texture, while the c-axis of the α-phase and the rolling direction (RD) met at a 70°~90° angle; similar texture could be found in duplex- and lamellar-microstructure, meanwhile a new texture that the c-axis of the α-phase paralleled to RD could be found in the alloy. Room temperature tensile strength of plates with duplex microstructure could be enhanced by the dislocations and sub-structures, while had little effect on tensile properties at high temperature. Texture was found to be the main factor affecting the anisotropy of tensile properties of Ti65 plates, the plate would possess good tensile properties without obvious anisotropy in tensile strength after heat treatment of 980℃/1 h/AC+700℃/4 h/AC.

Key words: matallic materials Ti-alloy Ti65 heat treatment microstructure texture tensile properties

Received: 21 February 2019

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	Xiyue WU
	Zhiyong CHEN
	Chao CHENG
	Jianrong LIU
	Dongsheng XU
	Qingjiang WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.110 OR https://www.cjmr.org/EN/Y2019/V33/I10/785

Table 1 Heat treatment of Ti65 plates

Fig.1 Microstructures of heat treated plates: (a, b) HT-α, (c, d) HT-αβL, (e, f) HT-αβH, (g, h) HT-β. Note that (a, c, e and g) are samples of RD and others are of TD

Fig.2 {0001}和

{11 2 ˉ 0}

pole figures of heat treated plates (a) HT-α, (b) HT-αβL, (c) HT-αβH, (d) HT-β

Heat treatment	R_p0.2/MPa		R_m/MPa		$σ$ /%
Heat treatment	RD	TD	RD	TD	RD	TD
HT-α	1053	1070	1141	1162	13.8	16.0
HT-αβL	1016	1034	1100	1119	13.5	14.3
HT-αβH	1037	1073	1134	1187	13.8	15.0
HT-β	1060	979	1161	1095	6.0	9.8

Table 2 Room temperature tensile property of plates after different heat treatments

Fig.3 Room temperature tensile strength of plates after different heat treatments

Heat treatment	R_p0.2/MPa		R_m/MPa		$σ$ /%
Heat treatment	RD	TD	RD	TD	RD	TD
HT-α	356	410	554	604	66.4	44.8
HT-αβL	423	444	562	590	49.3	31.0
HT-αβH	458	544	629	708	24.5	17.5
HT-β	578	553	716	668	/	7.0

Table 3 650℃ tensile property of plates after different heat treatments

Fig.4 Tensile strength at 650℃ after different heat treatments

Fig.5 Dislocations and substructures in plates after different heat treatment. (a) HT-α； (b) HT-αβL

Fig.6 Inverse pole figures of RD and TD in plates after different heat treatments and distribution map of Schmidt factors. (a) HT-α IPF-RD; (b) HT-α IPF-TD; (c) HT-αβL IPF-RD; (d) HT-αβL IPF-TD; (e) HT-αβ H IPF-RD; (f) HT-αβH IPF-TD; (g) HT-β IPF-RD; (h) HT-β IPF-TD; (i) Contour lines of Schmidt factors in the stress direction-basal plane; (h) Contour lines of Schmidt factors in the stress direction-prismatic plane

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