Control of the microstructure and mechanical properties of GTA-based wire arc additive manufactured TiAl alloys using post heat treatment

CAI Xiaoyu; DONG Bolun; WANG Junzhe; LIN Sanbao

doi:10.12073/j.hjxb.20210921002

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2022 > 43(3): 7-12. > DOI: 10.12073/j.hjxb.20210921002

CAI Xiaoyu, DONG Bolun, WANG Junzhe, LIN Sanbao. Control of the microstructure and mechanical properties of GTA-based wire arc additive manufactured TiAl alloys using post heat treatment[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(3): 7-12. DOI: 10.12073/j.hjxb.20210921002

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Control of the microstructure and mechanical properties of GTA-based wire arc additive manufactured TiAl alloys using post heat treatment

State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China

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Received Date: September 20, 2021
Available Online: April 27, 2022

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Abstract

The control of the microstructure and mechanical properties of deposited TiAl alloy with Al content of 45 at.% using heat treatment was studied. Based on the Ti-Al binary phase diagram, four heating temperatures were used: 1 080, 1 200, 1 270 and 1 350 ℃. Furnace cooling was applied after holding for 1 h. It was found that with the increase of the heating temperature, the segregation is gradually eliminated, and the γ phase on the grain boundary decreases. The microstructure changes from two-state structure to full lamellar structure, and the lamellar colony size increases gradually. Preservate heat at 1 350 ℃ for 5, 30 min and 1 h, respectively. It was found that the lamellar colony coarsened with the extension of holding time. Based on the single-stage heat treatment, the cyclic heat treatment process was proposed. The deposited parts were heated repeatedly between 900 to 1 200 ℃ and cooled after short-term insulation. The components with fine lamellar structure were obtained, whose hardness reduces, and the compressive strength and compression ratio both increase.
- arc additive manufacturing,
- TiAl alloy,
- heat treatment,
- microstructure,
- mechanical properties

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