Wire Electrical Discharge Machining characteristics of Nitinol-60 Shape Memory Alloy

In this experimental study, the multi-objective optimization of responses such as machining speed (MS), and surface roughness average (R-a) during the WEDM process of Nitinol-60 is carried out. Box-Behnken Designs in Response Surface Methodology (RSM) has been followed for the experimental design. The results predict that the highest machining speed and minimum R-a are 2.6218mm/min and 1.6563 mu m respectively for single-objective optimization and 2.1007mm/min and 1.7072 mu m for multi-objective optimization using the desirability approach. Monte - Carlo simulation, which is based on random data, was performed to analyze the model for 100,000 runs. The results suggest that the developed models are a good fit. FESEM images were studied for surface integrity and it is observed that at the optimal conditions, the surface defects like micro-cracks and voids decreased considerably. (C) 2019 Elsevier Ltd. All rights reserved.