Experimental study of a CoCrMo alloy treated by SMAT under rotating bending fatigue

The main objective of this work is to understand the fundamental damage mechanisms involved in a SMAT treated CoCrMo alloy subjected fatigue under rotating bending loads. For purpose, different load amplitudes are imposed on cylindrical specimens, as-machined and states. Different material characterizations performed order determine which features play an important role life studied alloy. Such done via digital microscopy, electron backscatter diffraction (EBSD), roughness measurements microhardness tests. results presented form S-N diagram show that with moderate intensity (SMAT-2) can enhance performance alloy, whereas higher (SMAT-3) seems deteriorate it. This decrease probably due surface micro-cracks generated by over-peening phenomenon.