Assessment on surface integrity of AISI 304 steel during powder mixed electrical discharge machining

The effect of mixing molybdenum-di-sulphide (MoS2) powder particle into the dielectric medium of electrical discharge machining is analysed. The duty factor and MoS2 powder particle size were taken as input parameters. Duty factor is varied at 2, 6,10 and two different size of MoS2 powder particles 40 mm, 90 nm were used. The significance of input parameters on crater, globules, and recast layer thickness were analysed. Peak current 6 A, discharge duration 300 ms, gap voltage 80 V, powder concentration 1 g/l, and a continuous ultrasonic vibration to dielectric fluid were maintained constant throughout the experiments. For both sizes of MoS2 powder particle, small size crater and minimum global appendages generated on the surface machined at duty factor 2. Compared to 40 lm size powder, more MoS2 powder particles gets deposit on the machined surface and minimum recast layer thickness is achieved while using 90 nm size powder into dielectric medium. (c) 2021 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the 28th International Conference on Processing and Fabrication of Advanced Materials.