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Etude des interactions entre l'azote et le carbone lors de traitements séquencés de nitruration, de carburation et de nitrocarburation à basse température d'aciers inoxydables austénitiques : application à la texturation de surface

Abstract : Different aspects of thermochemical treatments (nitriding, carburizing and nitrocarburizing) of austenitic stainless steel AISI 316 L conducted at low temperature were discussed. In the first chapter, a state of the art of these thermochemical treatments, as well as techniques used to achieve them have been presented. The nitriding and carburizing treatments, performed in a plasma reactor assisted by microwave in the Matrix Distributed Electron Cyclotron Resonance configuration, were studied in chapter 3. Analysis of the treated layers was performed by different experimental techniques: optical microscopy, profilometry, X-ray diffraction, Secondary Neutral Mass Spectroscopy, Secondary Ion Mass Spectrometry and glow discharge spectroscopy. In the fourth chapter, the nitrocarburizing treatment was studied and compared to sequenced carburization / nitriding and nitriding / carburizing treatments. A strong correlation was made between the average concentration of interstitial elements and the average compressive residual stress in the treated layers. The final chapter deals with the surface texturation or patterning to the nanometer or micrometer scale. To achieve this patterning, the deformation properties of the expanded austenite, formed during a nitriding treatment at low temperature, are used to construct a two dimensional array of dots, using grids or metallic tissues playing the role of masks to transfer a pattern on a piece of austenitic stainless steel
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  • HAL Id : tel-01748868, version 1

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Yuanyuan Guo. Etude des interactions entre l'azote et le carbone lors de traitements séquencés de nitruration, de carburation et de nitrocarburation à basse température d'aciers inoxydables austénitiques : application à la texturation de surface. Autre. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL047N⟩. ⟨tel-01748868⟩

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