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