Abstract
Inconel 625 is a Nickel–Chromium–Molybdenum based superalloy which is extensively used in numerous engineering applications like, aerospace, nuclear and marine fields, aeronautical, chemical, petrochemical industries, oil and gas extraction industries. It has high strength and outstanding corrosion resistance properties. The main problem with using this material is their low machinability while machining with conventional machining processes due to its high mechanical properties. From different unconventional machining processes (UCMP), the Electrical discharge machining (EDM) process is the most important and versatile UCMP and is suitable for machining any difficult to machine materials and it is most appropriate for the manufacturing of dies, molds, and press tools. Normally machining industries targets the achievement of high-quality products, relating to the surface finish, workpiece dimensional accuracy, high material removal rate (MRR) at low cost. Hence, the present research work deals with the optimization of process parameters in EDM of Inconel 625 alloy for minimizing the surface roughness (Ra) and maximizing MRR. EDM studies were conducted as per Taguchi’s L9 orthogonal array by varying process parameters such as current, voltage, pulse on time (Ton) and electrode bottom profile. Surface roughness and MRR values were measured. Effects of process parameters on the selected machinability responses were analyzed. Optimum process parameters were found for the optimization of EDM on Inconel alloy 625.
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