Effect of technological factors on low-cycle fatigue of 12Kh18N10T and 20 steels

The effect of technological factors on the low cycle fatigue of austenitic stainless steel 12Kh18N10T and 20 steel was investigated. Various geometries of the cutting part of a tool, surface roughness, ductility of metal surface layers and their thickness were taken into account. Effects of preliminary plastic deformation on low-cycle fatigue was determined after deforming the specimens completely by axial tensile loading to the strain of 11.5 and 17.3%. Cyclic loading was maintained using a symmetrical cycle of axial strains. No large difference was detected in the fatigue strength for finite life of 12Kh18N10T steel after different turning conditions. Results on the reduction of fatigue resistance of the steels agree with the theoretical values.