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Selective Laser Melting of In Situ TiB/Ti6Al4V Composites: Formability, Microstructure Evolution and Mechanical Performance

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Abstract

In the present study, a series of in situ TiB/Ti6Al4V composites were fabricated using selective laser melting. The formability, microstructure evolution and mechanical properties of the as-built samples added with different contents of TiB2 were studied. It is found that the densification level is related to both the content of TiB2 and laser energy density. The added TiB2 reinforcement particle can spontaneously react with titanium and then form the TiB phase. The needle-like TiB phase tends to transform into dot-like particles with the decrease in energy density. Additionally, with the increase in TiB2 content, the TiB phase is coarsened due to the increased nucleation rate and more reactions. The grain morphology is found to largely depend on the translational speed of solid–fluid interface determined by the temperature gradient and cooling rate. Also, the microhardness of the as-built TiB/Ti6Al4V composites is obviously improved. More interestingly, as the energy density increases, the microhardness of the as-built TiB/Ti6Al4V composites firstly increases and then decreases due to the synergy of grain size and different morphologies and distribution of TiB phases. The wear resistance of TiB/Ti6Al4V composites is far superior to that of Ti6Al4V alloy owing to the increased microhardness resulted from the uniform distribution of the hard TiB phase in the matrix.

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Acknowledgements

This work was financially supported by the Civil Aerospace Pre-research Project: research on additive manufacturing of core components in the liquid rocket engine, and the Fundamental Research Funds for the Central Universities (Nos. 2019kfyXMPY005 and 2019kfyXKJC042). The authors thank the Analytical and Testing Center and the State Key Laboratory of Materials Processing and Die & Mould Technology of Huazhong University of Science and Technology for tests.

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Authors and Affiliations

  1. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China

    Yue Su, Shun-Cun Luo, Liang Meng, Piao Gao & Ze-Min Wang

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  1. Yue Su
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  2. Shun-Cun Luo
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  3. Liang Meng
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  5. Ze-Min Wang
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Correspondence to Ze-Min Wang.

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Su, Y., Luo, SC., Meng, L. et al. Selective Laser Melting of In Situ TiB/Ti6Al4V Composites: Formability, Microstructure Evolution and Mechanical Performance. Acta Metall. Sin. (Engl. Lett.) 33, 774–788 (2020). https://doi.org/10.1007/s40195-020-01021-3

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  • DOI: https://doi.org/10.1007/s40195-020-01021-3

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