A comparative study relating machining properties and surface characteristics of Inconel 625 during powder mixed electric discharge machining

Abstract

In the current study, the machinability during the machining with powder mixed electric discharge machining was studied on Inconel 625 sample along with their surface characteristics. During the machining, separatelythree powders viz. titanium, graphite and silicon carbide were mixed in EDM oil dielectric fluid with a concentration of 4 g/l. The other electric parameters were kept constant. The comparative study was made to study the changes in MRR, surface roughness and tool wear rate. The analysis clearly indicates that. by the addition of titanium, graphite and silicon carbide in the order, the MRR decreases, surface roughness increases and tool wear rate increases. The SEM results of the machined sample indicate that the surface unevenness is increasing with changing of powders. The EDX result of the surface correlated the amount of copper transferred to the surface and the tool wear rate . Like the SEM result, EDX result also indicated the enhancement of the tool wear during the machining of above-said order of the powders.