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Article Dans Une Revue Procedia Structural Integrity Année : 2022

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.

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Dates et versions

hal-03612005 , version 1 (07-02-2023)

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L. Brasileiro, Zhidan Sun, C. Mabru, R. Chieragatti, G. Proust, et al.. Experimental study of a CoCrMo alloy treated by SMAT under rotating bending fatigue. Procedia Structural Integrity, 2022, 38, pp.283-291. ⟨10.1016/j.prostr.2022.03.029⟩. ⟨hal-03612005⟩

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