Effect of annealing time on microstructure and mechanical properties of Ti?6.0Al?3.0Zr?0.5Sn?1.0Mo?1.5Nb?1.0V titanium alloy

DING Ping; XIAO Han; CHEN Lei; LIU Kai-yuan; HUANG Hai-guang; YU Kun; ZHOU Rong-feng

doi:10.13374/j.issn2095-9389.2020.12.22.005

Volume 44 Issue 1

Jan. 2022

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DING Ping, XIAO Han, CHEN Lei, LIU Kai-yuan, HUANG Hai-guang, YU Kun, ZHOU Rong-feng. Effect of annealing time on microstructure and mechanical properties of Ti?6.0Al?3.0Zr?0.5Sn?1.0Mo?1.5Nb?1.0V titanium alloy[J]. Chinese Journal of Engineering, 2022, 44(1): 50-58. doi: 10.13374/j.issn2095-9389.2020.12.22.005

Citation:

DING Ping, XIAO Han, CHEN Lei, LIU Kai-yuan, HUANG Hai-guang, YU Kun, ZHOU Rong-feng. Effect of annealing time on microstructure and mechanical properties of Ti?6.0Al?3.0Zr?0.5Sn?1.0Mo?1.5Nb?1.0V titanium alloy[J]. Chinese Journal of Engineering, 2022, 44(1): 50-58. doi: 10.13374/j.issn2095-9389.2020.12.22.005

Citation:

DING Ping, XIAO Han, CHEN Lei, LIU Kai-yuan, HUANG Hai-guang, YU Kun, ZHOU Rong-feng. Effect of annealing time on microstructure and mechanical properties of Ti?6.0Al?3.0Zr?0.5Sn?1.0Mo?1.5Nb?1.0V titanium alloy[J]. Chinese Journal of Engineering, 2022, 44(1): 50-58. doi: 10.13374/j.issn2095-9389.2020.12.22.005

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Effect of annealing time on microstructure and mechanical properties of Ti?6.0Al?3.0Zr?0.5Sn?1.0Mo?1.5Nb?1.0V titanium alloy

doi: 10.13374/j.issn2095-9389.2020.12.22.005

1.
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
2.
Yunnan Titanium Industry Co., Ltd., Chuxiong 651209, China

More Information

Corresponding author: E-mail: kmxh@kust.edu.cn
Received Date: 2020-12-22
Available Online: 2021-03-27
Publish Date: 2022-01-01

Abstract

Abstract

The effect of annealing time on the microstructure and mechanical properties of Ti?6.0Al?3.0Zr?0.5Sn?1.0Mo?1.5Nb?1.0V new titanium alloys were studied based on the optimum annealing temperature of 740 ℃. Results show that after smelting thrice by vacuum consumable arc furnace and thrice hot rolling processes, the microstructure of the sheet is the partial recrystallization structure composed of the primary α phase, structure of β transformation, and the processing status structure. With increased annealing time, the microstructure of the annealed sheet is mainly composed of the primary α phase, with the proportion of the α phase being gradually increased from 81.73% to 85.61%. The strip-shaped α phase in the microstructure is broken and spheroidized gradually, and an equiaxial α phase begins to be homogenized and coarsened. With the increase of annealing time, the elongation of annealed sheets increases greatly; the tensile strength initially decreases, increases, and then decreases again; and the yield strength and the microhardness first increase and then decrease. When the annealing time is 1 h, the fracture of the sheet has a ductile fracture mode and is composed of slip bands, ripple appearance, and small equiaxial dimples. When the annealing time is more than or equal to 2 h, the fracture exhibits a ductile fracture mode and is completely composed of equiaxial dimples. The optimal annealing process is achieved at 740 ℃ for 2 h, in which the tensile strength, yield strength, elongation, and microhardness of the alloy plate is 984 MPa, 941 MPa, 15.27%, and HV 347.67, respectively. The main results from this paper can guide the formulation of the annealing process of high-strength corrosion-resistant titanium alloy and provide a scientific basis for solving problems encountered in the actual production of titanium alloy.
- titanium alloy,
- rolling,
- annealing time,
- microstructure,
- mechanical properties

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References(27)

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