Sustainable Precision Machining of Nimonic 90 Alloy with Biodegradable B₄C-Enriched Dielectric in Micro-EDM

DOI

10.2991/978-94-6239-750-7_5How to use a DOI?

Keywords

Micro-EDM; Nimonic 90; Biodegradable dielectric; Surface integrity; Sustainable machining

Abstract

The study explores the application of coconut oil-based biodegradable dielectric fluid enriched with boron carbide (B₄C) nanoparticles in micro-electric discharge machining (micro-EDM) of Nimonic 90 alloy. Experiments were designed using response surface methodology (RSM) with a central composite design to evaluate the effects of pulse-on time, current, and powder concentration on material removal rate (MRR) and average surface roughness (ASR). The results revealed that discharge current had the highest influence on MRR, while pulse-on time was the most significant factor for ASR. Optimal machining conditions of 60 µs pulse duration, 20 A current, and 15 g/L B₄C concentration achieved a maximum MRR of 0.0271 g/min and a minimum ASR of 3.15 µm. Microstructural analysis through SEM confirmed the presence of recast layers, microcracks, and voids, with improved surface integrity under optimized conditions. The integration of coconut oil with B₄C nanoparticles not only enhanced machining performance but also demonstrated environmental benefits, cost-effectiveness, and sustainability compared to conventional hydrocarbon-based dielectrics. These findings highlight the potential of bio-based nanofluid dielectrics as an eco-friendly and efficient alternative for precision machining of nickel-based superalloys.

Copyright

© 2026 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Sahil Sharma
AU  - Sukhdeep Singh
AU  - Shivam Kumar
AU  - Shubhashit Chowdhury
PY  - 2026
DA  - 2026/08/31
TI  - Sustainable Precision Machining of Nimonic 90 Alloy with Biodegradable B₄C-Enriched Dielectric in Micro-EDM
BT  - Proceedings of the International Conference on Advanced Design, Manufacturing, and Sustainable Energy Systems (ICADMSES 2026)
PB  - Atlantis Press
SP  - 47
EP  - 65
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6239-750-7_5
DO  - 10.2991/978-94-6239-750-7_5
ID  - Sharma2026
ER  -