Machinablity analysis and optimisation of process paramater in the turining of Inconel 718 alloy using multi criteria decision making method: A comparative study

Abstract Manufacturing sectors strive towards low-toxic, environmentally friendly machining to combat climate change. Due to its low heat conductivity, machining Inconel 718 alloy is a difficult process nowadays. The purpose of this research is to investigate the turning of Inconel 718 alloy under PVD TiAlN inserts in two distinct environments: dry and atomized spray cutting fluid (ASCF). The effect of various machining performance such as surface roughness(Ra), vibration acceleration (VA), and tool life (TL) analysis of Inconel 718 alloy in ecologically friendly machining were investigated in this study. Further, Multicriteria decision-making (MCDM) was used to find best optimal process settings: TOPAIS (Technique for Ordering Performance by Similarity to Ideal Solution), CODAS (Combinative Distance-Based Assessment Technique), and EDAS (Evaluation Based on Distance from Average Solution) are three techniques for evaluating performance by similarity to ideal solution. In an ASCF setting, the MCDM approach yields comparable results with an ideal cutting speed (vc) of 50 m/min, feed rate (f) of 0.15 mm/rev, and depth of cut (ap) of 0.4mm. In contrast to dry machining, ASCF machining yielded a 17–34% improvement in surface quality. In dry circumstances, the crater and chipping processes were obvious in the rake face, although less wear was noticed in ASCF machining. Because the thermal conductivity of cutting fluids is improved by microscopic droplets of ASCF, rapid heat dissipated from the machining zone.