Residual stresses and endurance limit of surface hardened specimens with different diameters radius

Semicircular profile cut radius influence on cylindrical solid and hollow specimens made of steel 20 with 25 mm diameter endurance limit has been examined under outstripping superficial plastic deforming. It’s established that the endurance limit decreases with the increase of cut radius from 0,3mm to 1mm under the same type of hardening. It should be increase the specimens hardened superficial lay thickness under outstripping superficial plastic deforming for hardening effect conservation.