Investigation on microstructure characteristics of Ti-48Al alloy fabricated using twin-wire directed energy deposition-plasma arc

WANG Lin; HUA Xueming; SHEN Chen; ZHANG Yuelong; LI Fang; ZHOU Wenlu; DING Yuhan

doi:10.12073/j.hjxb.20230309001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2024 > 45(2): 1-6. > DOI: 10.12073/j.hjxb.20230309001

WANG Lin, HUA Xueming, SHEN Chen, ZHANG Yuelong, LI Fang, ZHOU Wenlu, DING Yuhan. Investigation on microstructure characteristics of Ti-48Al alloy fabricated using twin-wire directed energy deposition-plasma arc[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(2): 1-6. DOI: 10.12073/j.hjxb.20230309001

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Investigation on microstructure characteristics of Ti-48Al alloy fabricated using twin-wire directed energy deposition-plasma arc

Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

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Received Date: March 08, 2023
Available Online: November 20, 2023

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Abstract

Abstract

Ti-48Al alloy is fabricated successfully using plasma arc powred twin wire-directed energy deposition-arc, and its microstructure characteristic before and after heat treatment is systematically investigated. The results show that as-deposited Ti-48Al alloy consists of α₂ and γ phase. The microstructure is characterized by the alternatively distributed dendritic grain and fully lamellar colony along the building direction for as-deposited Ti-48Al alloy, and there is interdendritic Al element segregation in the dendritic grain region. After heat treatment in 1340 ℃/10 h/furnace cooling, the duplex microstructure with fine grain size is obtained, and the microstructure heterogeneity is significantly improved, the α₂ phase content is obviously increased, the preferred orientation of microstructure is also weakened.
- directed energy deposition-arc,
- TiAl alloy,
- microstructure,
- heat treatment

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References (23)

References

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Investigation on microstructure characteristics of Ti-48Al alloy fabricated using twin-wire directed energy deposition-plasma arc