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Multi-Criteria Decision-Making of EDM Parameters for Incoloy 800HT Alloy with Morphological Study

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Abstract:

Machining of extremely hard materials with complex shapes are very difficult in traditional processes due to which Electro Discharge Machining (EDM) is being used in many industries mainly aerospace, medical, automotive etc. EDM uses a series of sparks generated between tool-electrode and workpiece-anode to erode materials. These sparks are generated continuously inside the dielectric fluid and produce extreme heat which melt and vaporize the material. Pumping action of the dielectric fluid helps in removing excess material from machined surface. In this experimental work, the impact of input parameters namely current, pulse on time and voltage on two performance features like material removal rate (MRR) and surface roughness (Ra) have been investigated. Incoloy 800HT is used as work-piece and copper as tool material. Incoloy 800HT is an iron-nickel-chromium-based superalloy known for its ability to retain mechanical properties at high temperatures and its exceptional resistance to oxidation, carburization, and corrosion. Taguchi based grey analysis is used the multi-criterion decision-making (MCDM) method for optimization. From the analysis it is revealed that current has the most significant influence on both material removal rate (MRR) and surface roughness (SR), with higher current increasing MRR but deteriorating Ra. Micrograph analysis of machined surface is performed using scanning electron microscope (SEM).

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Periodical:

Key Engineering Materials (Volume 1036)

Pages:

65-73

DOI:

https://doi.org/10.4028/p-fkPO0k

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Online since:

December 2025

Authors:

Subhasit Shishang Bhoi, Satyabrata Barik, Basanta Kumar Nanda*, Sambit Kumar Mohapatra, Swayam Bikash Mishra, Mantra Prasad Satpathy, Santosh Kumar Nayak

Keywords:

Copper Electrode, EDM, Grey Analysis, Incoloy 800HT, SEM, Taguchi OA

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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