Abstract
In this comprehensive study, the influence of discharge energy of the EDM process was correlates with the formation of heat-affected zone (HAZ) depth in 40CrNi steel alloy. The change in micro-hardness distribution of the treated surface measured cross-sectionally from the machined surface and represented the extent of HAZ. The orthogonal central composite design methodology was used to conduct the experiment. An empirical model has presented the relationship between the EDM discharge energy and the depth of the heat-affected zone. It was found that the change in the surface layer after EDM reduces the fatigue life of samples up to 30% as compared to the sample prepared by the conventional turning process.
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