Electric discharge machining is extensively used to process difficult to cut materials such as superalloys, composite materials etc. The quality of machining can be improved by adding particles into the dielectric fluid which is commonly known as powder mixed electric discharge machining (PMEDM). In the present study, titanium and graphite powder are added to dielectric fluid and the effects of the powders have been analysed on material removal rate, surface roughness, microhardness and surface morphology analysis. Six experiments have been conducted considering each powder with three different levels of pulse current 4A, 8A and 12A. The analysis of the result indicates MRR, surface roughness and microhardness significantly increase with the increase of pulse current. Titanium mixed EDM improves the MRR and microhardness but reduces the surface quality. The SEM investigations elucidate that the samples machined with Titanium powder mixed with EDM have fewer surface defects, cracks, microholes and layer deposition compared to the sample machined with Graphite powder.
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