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Effect of substrate temperature on microstructure and mechanical properties of TiAl alloy fabricated using the twin-wire plasma arc additive manufacturing system

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Abstract

TiAl alloy becomes a promising high-temperature structural material due to excellent mechanical properties at elevated temperature. However, the inherent brittleness makes it difficult to be processed by traditional technologies. Therefore, an innovative twin-wire plasma arc additive manufacturing (TW-PAAM) process is developed to fabricate TiAl alloy. Substrate heating is indispensable during additively manufactured TiAl alloy, which can alleviate its crack tendency. In this paper, crack-free TiAl alloy samples are fabricated using TW-PAAM, and the effect of substrate temperature (560, 620 and 680 °C) on as-deposited TiAl alloy is investigated in detail. With the increase in substrate temperature, microstructural lamellar spacing and colony size exhibit the tendency of increase. Also, α2 phase content, recrystallization degree and high Schmid factor frequency present the decrease tendency. These variations of microstructure characteristics further lead to the decrease in both microhardness and tensile properties of the deposit. These findings provide a valuable reference for optimizing microstructures and mechanical properties of additively manufactured TiAl alloys.

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Acknowledgements

The authors gratefully acknowledge financial support from Science and Technology Commission of Shanghai Municipality (STCSM, Funding No. 19511106400, “Sailing Program” No. 19YF1422700) and T(NSFC, Funding No. 51901136). The authors would also like to thank Xiaomin Li in the Instrumental Analysis Center of Shanghai Jiao Tong University for helping in instrumental operation.

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Authors and Affiliations

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

    Lin Wang, Wenlu Zhou, Chen Shen, Yuelong Zhang, Fang Li, Yuhan Ding, Jianwen Xin & Xueming Hua

  2. Baosteel Research Institute, Baoshan Iron & Steel Co., Ltd, Shanghai, 200431, China

    Baosen Wang

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  1. Lin Wang
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Correspondence to Chen Shen or Xueming Hua.

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Wang, L., Zhou, W., Shen, C. et al. Effect of substrate temperature on microstructure and mechanical properties of TiAl alloy fabricated using the twin-wire plasma arc additive manufacturing system. J Mater Sci 57, 8940–8955 (2022). https://doi.org/10.1007/s10853-022-07228-2

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