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Caractérisation de l'effet de traitement de nanocristallisation superficielle (SMAT) sur un alliage CoCrMo

Abstract : This aims of this work is to evaluate the wear behavior of CoCrMo parts used in orthopedics. The Surface Mechanical Attrition Treatment (SMAT) method coupled with biomedical polishing has been used in this study to improve the mechanical and tribocorrosive properties of a CoCrMo alloy. In a first step, an optimization of the SMAT parameters on a CoCrMo alloy was carried out. Different surface finishing techniques were then studied to obtain an acceptable surface finish for orthopedic implants. Microstructural characterization techniques were then applied on SMATed and polished samples: scanning and transmission electron microscopy (SEM, MET), backscattered electron diffraction (EBSD), transmission kikuchi diffraction (TKD), and ray diffraction X (XRD). The results obtained showed that the SMAT treatment can create a refinement of the surface grains of the CoCrMo alloy with the presence of nano-grains in the extreme surface. Indentation measurements as well as incremental hole tests were performed. An increase of more than 30% of the hardness was observed after SMAT as well as the generation of residual surface compressive stresses. The tribocorrosive properties of the CoCrMo alloy were also studied by disk wear tests, scratch tests, and electrochemical tests before and after SMAT.
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Submitted on : Wednesday, December 18, 2019 - 2:53:08 PM
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  • HAL Id : tel-02418018, version 1

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Daniella Vashti Tchana Nkonta. Caractérisation de l'effet de traitement de nanocristallisation superficielle (SMAT) sur un alliage CoCrMo. Micro et nanotechnologies/Microélectronique. Université de Technologie de Troyes, 2017. Français. ⟨NNT : 2017TROY0005⟩. ⟨tel-02418018⟩

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