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Grippage des aciers inoxydables : influence de la nature des matériaux, de la microstructure et des traitements thermochimiques de surface

Abstract : Galling is a complex phenomenon requiring a multi-scale and multi-physical approach. During this thesis, 6 stainless steel grades (316L, 316LN, Nitronic60, AIS1660, Uranus45N et 17-4PH) are studied, both untreated and after S3P thermochemical heat surface treatment. These materials are tested according to ASTM G98 galling test and resulting samples are then characterized. This characterization is at first realized on the surface (surface morphology evolution, SEM investigations...), then on the bulk material, consisting mainly into a microstructural characterization based on EBSD, XRD and TEM investigations. It results from this thesis a better comprehension of the galling mechanisms in the case of stainless steel. The various effects of material composition, microstructure and material properties in general are also discussed.
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Submitted on : Tuesday, December 17, 2019 - 1:47:08 PM
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Thibault Lesage. Grippage des aciers inoxydables : influence de la nature des matériaux, de la microstructure et des traitements thermochimiques de surface. Matériaux. Université de Technologie de Compiègne, 2019. Français. ⟨NNT : 2019COMP2486⟩. ⟨tel-02415915⟩

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