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On Fabrication of Inconel 718 Slab by Wire Arc Additive Manufacturing: Study of Built Microstructure and Mechanical Properties

  • Research Article-Mechanical Engineering
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Abstract

A slab of dimension (152 \(\times\) 25 \(\times\) 18) mm3 is successfully fabricated through Cold Metal Transfer + Metal Inert Gas-based Wire Arc Additive Manufacturing (WAAM). 4.3 kg/h deposition rate is achieved. WAAMed Inconel 718 exhibits dendritic microstructure which grows along the build direction. In the solid solution matrix of Ni–Cr–Fe, Laves phase, Nb-rich MC-type carbides and delta (\(\delta\)) phases are detected. The average tensile strength along horizontal direction is obtained as ~ 824 MPa. Location-specific microstructure evolution causes significant extent of property anisotropy predominantly along the build direction. The horizontal tensile specimen extracted from the bottom region of the slab exhibits the highest tensile strength (UTS), while the lowest tensile strength is obtained for the specimen extracted from the middle zone of the fabricated slab. Temperature data as recorded by the thermocouples are utilized to understand the complex heat interaction phenomena during WAAM process. Laves phase is completely dissolved during homogenization treatment thus microstructure of aged specimen only consists of strengthening phase, i.e., \(\gamma^{\prime\prime}\) (Ni3Nb) and Nb-rich MC carbides.

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Acknowledgements

Authors gratefully acknowledge the support rendered by Dr. Bassam El Ali, Managing Editor (AJSE). Special thank goes to the anonymous reviewers for their valuable constructive comments and suggestions to prepare the paper a good contributor.

Funding

Funding was provided by CSIR-NML, Jamshedpur, India (Grant No. In-house grant OLP-0415).

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Institute of Technology Rourkela, Rourkela, 769008, Odisha, India

    Nimai Haldar, Sameer Anand & Saurav Datta

  2. CSIR-National Metallurgical Laboratory, Jamshedpur, Jharkhand, 831007, India

    Atanu Das

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  1. Nimai Haldar
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  2. Sameer Anand
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Correspondence to Saurav Datta.

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Haldar, N., Anand, S., Datta, S. et al. On Fabrication of Inconel 718 Slab by Wire Arc Additive Manufacturing: Study of Built Microstructure and Mechanical Properties. Arab J Sci Eng 49, 2045–2063 (2024). https://doi.org/10.1007/s13369-023-08095-y

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