Comparative machinability characterization of wire electrical discharge machining on different specialized AISI steels (original) (raw)

2019, Bulletin of Materials Science

The work attempted to prepare a comparative machinability study of wire electrical discharge machining of different difficult-to-machine materials viz. stainless steel 316, H21 hot work tool steel and M42 high-speed steel. The key features, which are compared during the analysis are mainly as material removal rate, average surface roughness, kerf width, wire consumption rate, recast layer, elemental diffusion, surface morphology and microhardness of machined surface. They are found to a be greatly influenced by the pulse energy. The pulse energy is calculated in terms of 'specific discharge energy'. Apart from the discharge energy, the thermal conductivity of the material also plays an important role that affects the formation of recast layer and inclusion of foreign elements like carbon, oxygen, copper, and zinc in the recast layer. H21 steel has been found more prone to thermal defect due to its high thermal conductivity and high tensile residual stresses, whereas more resolidification of foreign materials is observed in stainless steel 316 and M42 high-speed steel due to their high adhesive property and low thermal conductivity. But, in low energy cutting, more uniform surfaces are observed in H21 steel in comparison to other two type s of steel.

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