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Microstructure Evolution in Direct Energy Deposited Multilayer Inconel 718

  • RESEARCH ARTICLE - SPECIAL ISSUE - Impact of Advanced Tribological Technologies on Modern Industry
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Abstract

The present work is aimed to investigate the microstructure evolution in multilayer Inconel 718 (IN718) superalloy deposited by laser-aided direct energy deposition, which was studied using a scanning electron microscope (SEM). The results show a dendritic morphology with long columnar grains at the bottom and middle regions, while equiaxed structures are observed at the top deposited region. The niobium (Nb)-rich Laves phase formation at the interdendritic area is found in the IN718 superalloy microstructure. Energy-dispersive X-ray spectroscopy (EDS) analysis results confirm severe elemental (Nb, Mo, and Ti) segregation in IN718 deposition. A 17% increase in Nb segregation is observed at the top region, whereas it is only 4% in the bottom region. Additionally, the dendrites’ size is increased along with Laves phase quantity as the number of layers is increased. Moreover, the microhardness studies showed a decreasing trend with the increment in layers which could be due to the depletion of strengthening phases in the dendritic nickel (Ni) matrix.

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Acknowledgements

The research is financially supported by the Department of Science and Technology (DST), Govt. of India; Project No. DST/TDT/AMT/2017115(G). The authors express sincere thanks to M/s Shreenath Engineering Industries, Nagpur for allowing us to use their laser cladding facility for experimentation.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Visvesvaraya National Institute of Technology, Nagpur, India

    Chaitanya Gullipalli, Nikhil Thawari & T. V. K. Gupta

  2. Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology, Nagpur, India

    Prayag Burad & Jatin Bhatt

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  1. Chaitanya Gullipalli
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Contributions

TVKG contributed to conceptualization, reviewing and editing, supervision. CG was involved in experimentation, investigations, analysis, paper writing. PB contributed to microstructure data acquisition, mechanical testing. NT was involved in editing, graphs, plotting. JB contributed to analysis, reviewing.

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Correspondence to T. V. K. Gupta.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Gullipalli, C., Burad, P., Thawari, N. et al. Microstructure Evolution in Direct Energy Deposited Multilayer Inconel 718. Arab J Sci Eng 47, 7985–7994 (2022). https://doi.org/10.1007/s13369-021-05899-8

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  • DOI: https://doi.org/10.1007/s13369-021-05899-8

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