Studying Heat-Affected Zone, Surface Roughness and Material Removal Rate in NPMEDM Process for Inconel 718 Using Nano Silicon Carbide Powder
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Abstract
Nano powder mixed electrical discharge machining (NPMEDM) is one of the non-traditional machining processes employed to machine metals, which can be tough to machine using traditional processes. It is accomplished by adding conductive powders to dielectric fluid to enhance the performance of the process. In this paper, several experiments were conducted to enhance the process performance in terms of white layer thickness (WLT), heat affected zone (HAZ), surface roughness (SR), and material removal rate (MRR) of the Inconel 718 alloy, machined using Nano SiC powder added to soybean oil, used as a dielectric fluid. The chosen process variables were discharge current, pulse on time, powder concentration, and magnetic field. Experimental outcomes revealed that adding 2 g/l Nano SiC to soybean oil improved the white layer thickness by about 55.16% compared to 0 g/l and 4 g/l additions, while the thickness of heat affected zone increased. Surface roughness and MRR improved when adding 4 g/l of NanoSic to the dielectric fluid; the improvements were approximately 5.54% and 53.99%, respectively.
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