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EDM performance of Inconel 718 superalloy: application of multi-walled carbon nanotube (MWCNT) added dielectric media

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Abstract

Electro-discharge machining (EDM) is very promising non-traditional machining route to cut ‘difficult-to-machine’ materials like Inconel 718 superalloy. However, low material removal efficiency and inferior surface integrity restricts EDM application on Inconel 718. In order to improve EDM performance, multi-walled carbon nanotube (MWCNT) dispersed into kerosene is explored as dielectric media. Experiments are conducted by varying peak discharge current with a fixed concentration of MWCNT (0.5 g/l) added to kerosene. EDM performance is assessed in purview of material removal efficiency, tool wear rate, and surface integrity (morphology and topography) of the EDMed specimen. Apart from morphological study, surface topography including surface roughness, crack density, recast layer thickness, metallographic alteration, residual stress, and micro-indentation hardness of the machined specimen are studied in detail. It is concluded that as compared to conventional EDM, use of MWCNT-mixed dielectric media (0.5 g/l) significantly improves machining performance.

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Acknowledgements

Authors gratefully acknowledge the support rendered by Dr. Francisco Ricardo Cunha, Editor-In-Chief, Journal of the Brazilian Society of Mechanical Sciences and Engineering (BMSE). Special thank goes to the anonymous reviewers for their constructive comments and suggestions that helped us to make the final paper a good contributor.

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Authors and Affiliations

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

    Thrinadh Jadam, Saurav Datta & Manoj Masanta

  2. Department of Mechanical Engineering, Veer Surendra Sai University of Technology (VSSUT), Burla, Sambalpur, Odisha, 768018, India

    Santosh Kumar Sahu

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Correspondence to Saurav Datta.

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Jadam, T., Sahu, S.K., Datta, S. et al. EDM performance of Inconel 718 superalloy: application of multi-walled carbon nanotube (MWCNT) added dielectric media. J Braz. Soc. Mech. Sci. Eng. 41, 305 (2019). https://doi.org/10.1007/s40430-019-1813-9

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