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Energy Density Dependence of Bonding Characteristics of Selective Laser-Melted Nb–Si-Based Alloy on Titanium Substrate

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Spherical Nb–20Si–24Ti–2Cr–2Al pre-alloyed powders were processed by selective laser melting (SLM) on Ti6Al4V substrates with different energy densities. A series of single tracks and single layers were produced using different processing parameters, including powder size, laser power, scanning speed and hatch distance. Results showed that the pre-alloyed powders ranging from 45 to 75 μm were more applicable to SLM with less balling tendency, in comparison with those between 75 and 180 μm. The increase in linear energy density (LED) resulted in the decrease in contact angle and the increase in the width of single track as well as its penetration depth into the substrate. Smaller hatch distance leaded to a larger remelted part of the former track and a higher volumetric laser energy density. With a thickness of 75.6 μm, an interfacial intermediate layer, enriched in Ti and depleted in Nb, Si, Cr and Al, was formed between the SLM part and the Ti6Al4V substrate. The mechanisms of the elimination of balling phenomenon by employing a higher LED and the interfacial bonding characteristics between Nb–Si-based alloys via SLM and the Ti6Al4V substrate were discussed.

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Acknowledgements

This work was supported financially by the National Natural Science Foundation of China (Nos. 51471013 and 51571004).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

    Yue-Ling Guo, Li-Na Jia, Bin Kong, Yong-Lin Huang & Hu Zhang

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  1. Yue-Ling Guo
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  2. Li-Na Jia
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  3. Bin Kong
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  4. Yong-Lin Huang
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  5. Hu Zhang
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Correspondence to Li-Na Jia.

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Available online at http://link.springer.com/journal/40195.

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Guo, YL., Jia, LN., Kong, B. et al. Energy Density Dependence of Bonding Characteristics of Selective Laser-Melted Nb–Si-Based Alloy on Titanium Substrate. Acta Metall. Sin. (Engl. Lett.) 31, 477–486 (2018). https://doi.org/10.1007/s40195-017-0670-8

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  • DOI: https://doi.org/10.1007/s40195-017-0670-8

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