Skip to Main content Skip to Navigation
Theses

Influence du traitement de nitruration ionique sur les propriétés fonctionnelles des aciers inoxydables martensitiques

Abstract : The nitriding process of steels is a well known thermochemical surface treatment generally used for manufacturing components of type sprocket or gearings, requiring high superficial hardness. The aim of our present work is mainly focused on the optimizing of the nitriding treatment in order to understand the relationship between the metallurgical state and the marine corrosion resistance of nitrided martensitic stainless steels thanks to a multi-scale approach. Nitriding were performed by a low temperature plasma treatment (Direct Current mode). The objective is to understand the relationship between the metallurgical state of the nitrided layer and its corrosion resistance thanks to a multi scale analysis and characterization. The evolution of microstructure is studied by electron microscopy (TEM and SEM) and X-ray diffraction. An increase of the thickness of the nitrided layer with temperature is observed and a precipitation of CrN and others nitrided phases (ε, γ’ ou α’N) in relation with temperature treatment for each alloys occurred. The electrochemical properties of nitrided samples are assessed by voltametry test and Mott-Schottky test. The results highlight a thermal effect and an impact of the compound layers on resistance to pitting corrosion. Relations were established between different nitrided sublayers, their nature and the properties of corrosion resistance. Tribological tests have also been occurred, allow to observe a significant improvement in wear resistance properties (hardness, wear resistance).
Document type :
Theses
Complete list of metadatas

Cited literature [85 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-02469368
Contributor : Abes Star :  Contact
Submitted on : Thursday, February 6, 2020 - 3:10:16 PM
Last modification on : Wednesday, October 14, 2020 - 3:55:11 AM

File

2019Reilhac125047.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-02469368, version 1

Collections

Citation

Pierre Reilhac. Influence du traitement de nitruration ionique sur les propriétés fonctionnelles des aciers inoxydables martensitiques. Matériaux. Université de La Rochelle, 2019. Français. ⟨NNT : 2019LAROS005⟩. ⟨tel-02469368⟩

Share

Metrics

Record views

165

Files downloads

785