The residual stresses produced in the surface layers of KEA145 (AISI H13) tool steel specimens during electrodischarge machining have been measured by the bending-deflection method. Stress-depth profiles were obtained through progressive removal of material by electropolishing. High residual tensile stresses were found in all specimens, decreasing from a maximum – at the surface for the finishing generator and 20 μm below the surface for the roughing generator – to zero at a depth of about 200 μm. The magnitude of the residual stress increased with pulse energy.
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Merdan et al. (1991) studied this question.