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Mechanical and microstructural characterization of additive manufactured Inconel 718 alloy by selective laser melting and laser metal deposition

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Abstract

The direct comparison of the microstructure and tensile properties of Inconel 718 fabricated by selective laser melting (SLM) or laser metal deposition (LMD) has been carried out. In the as-built state, LMD-fabricated specimens show lower tensile yield strength and fracture elongation than SLM-fabricated specimens due to the coarser solidification microstructure, including grains, cellular dendrites and Laves phases. This is mainly because the cooling rate of the LMD process is 2 to 3 orders lower than that of the SLM process. Upon the same heat treatment, both yield strengths of SLM- and LMD-fabricated specimens are enhanced significantly. Notably, LMD-fabricated specimens exhibit simultaneous improvement in the strength and ductility, which is mainly attributed to the presence of small granular Laves phases and uniformly distributed nanoscale γ″ strengthening phases. The results could serve as a guidance for selecting suitable post-heat treatment routes for specific additive manufacturing process to attain excellent strength–ductility synergy.

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Acknowledgements

The authors acknowledge financial support by the National Natural Science Foundation of China (U1830121 and 11988102) and National Science and Technology Major Project (2017-VI-0003-0073).

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Authors and Affiliations

  1. Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing, 100871, China

    Fa-yun Lu, Hong-yuan Wan, Xin Ren, Li-ming Huang, Hai-lin Liu & Xin Yi

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  1. Fa-yun Lu
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  2. Hong-yuan Wan
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  3. Xin Ren
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Correspondence to Xin Yi.

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Lu, Fy., Wan, Hy., Ren, X. et al. Mechanical and microstructural characterization of additive manufactured Inconel 718 alloy by selective laser melting and laser metal deposition. J. Iron Steel Res. Int. 29, 1322–1333 (2022). https://doi.org/10.1007/s42243-022-00755-x

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  • DOI: https://doi.org/10.1007/s42243-022-00755-x

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