ArticleScientific reports2026
Multi-objective optimization of EDM machining of Waspaloy employing composite electrode.
Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Electrical Discharge Machining (EDM) has emerged as an effective technique for machining difficult-to-cut superalloys such as Waspaloy, which are widely used in aerospace applications due to their superior mechanical strength and thermal stability but exhibit poor machinability under conventional processes. The present study focuses on enhancing EDM performance through the combined use of copper-graphite (Cu-Gr) composite electrodes and eco-friendly dielectric media, along with multi-objective optimization. Composite electrodes with graphite content 5 wt% were fabricated, and machining experiments were conducted under different process parameters, including discharge current, pulse-on time, pulse-off time, and inter-electrode gap. Machining performance was evaluated in terms of material removal rate (MRR), tool wear rate (TWR), and surface roughness (Ra), while surface integrity was analyzed using scanning electron microscopy (SEM). A TOPSIS-based multi-objective optimization approach was employed to determine the optimal machining conditions. The results indicated that discharge current and pulse-on time significantly influence MRR, with a maximum MRR of approximately 0.43 mm
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