Parametric optimization of output responses in wire electrical discharge machining of inconel 718: An integrated TOPSIS-multi-objective ant-lion approach Parametrische Optimierung der Ausgangsreaktionen bei der Drahterodierung von Inconel 718: Ein integrierter TOPSIS-Ansatz mit Mehrziel-Ant-Lion-Verfahren

Abstract

The research investigated the impact of process parameters namely; pulse on time, pulse-off time and peak current on crucial factors such as material removal rate, surface roughness and micro-hardness during the wire electrical discharge machining of inconel 718 alloy. The experimental trials were conducted by using a Taguchi L27 orthogonal array design method. The outcomes had observed an increase in pulse-on time corresponds to elevated micro hardness by 6 % and material removal rate by 18 %, while the surface roughness decreases by 61 %. Conversely, surface roughness was increased by 50 % with change in pulse-off time from 8 μs to 18 μs and peak current from 2 A to 4 A. The analysis of variance has observed pulse-on time as the most influential parameter for material removal rate, surface roughness, and micro-hardness which primarily associated with the formation of recast layer. The implementation of the multi-objective ant-lion optimization algorithm has successfully estimated the multiple pareto-optimal points across the parameter levels and response values. Moreover, the integrated Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS)-Multi-objective ant-lion optimization has facilitated the selection of the best optimal point from several pareto-optimal points and aids in decision-making process.