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Microstructure and Fatigue Properties of Ti-48Al Alloy Fabricated by the Twin-Wire Plasma Arc Additive Manufacturing

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Abstract

Due to the inherent temperature brittleness and poor workability, the forming and fabrication of TiAl alloy is extremely difficult. Thus, in recent years, an innovative twin-wire-based plasma arc additive manufacturing (TW-PAAM) technique has been developed to fabricate the Ti-48Al alloy with low cost. In this research, the Ti-48Al alloys are fabricated by the TW-PAAM and the tungsten inert gas welding-based wire and arc additive manufacturing (TIG-WAAM). Afterward, the microstructure, residual stress and fatigue properties are characterized subsequently. The microstructure of the TiAl alloy was found to consist of a dendritic grain region and a fully lamellar colony region. The fully lamellar colonies composed of α2 and γ phases, and the size of the lamellar colonies tends to increase from the upper to the lower. The residual stress value in the TiAl alloy of lower part is higher than the upper part. Additionally, the mean residual stress value of TW-PAAM TiAl alloy (57.6 MPa) is lower than the TIG-WAAM TiAl alloy(68.4 MPa), decreasing by 15.7%. And the fatigue strength of TiAl alloy in the lower part shows poor fatigue properties compared to the upper part, which is mainly attribute to the effect of residual stress and the size of lamellar colonies.

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Acknowledgments

This research was supported by Shanghai Science and Technology Committee Innovation Grants (nos. 19511106400 and 19511106402), the National Natural Science Foundation of China (no. 52075317), and the State Key Laboratory of Metal Material for Marine Equipment and Application (no. SKLMEA-K201906).

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Authors and Affiliations

  1. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China

    Xi Zhang, Qinghua Lu, Peilei Zhang & Zhishui Yu

  2. Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, People’s Republic of China

    Chen Shen, Lin Wang & Xueming Hua

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  1. Xi Zhang
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  2. Qinghua Lu
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Correspondence to Qinghua Lu.

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Zhang, X., Lu, Q., Zhang, P. et al. Microstructure and Fatigue Properties of Ti-48Al Alloy Fabricated by the Twin-Wire Plasma Arc Additive Manufacturing. J. of Materi Eng and Perform 31, 8250–8260 (2022). https://doi.org/10.1007/s11665-022-06847-9

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