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Article Dans Une Revue International Journal of Microstructure and Materials Properties Année : 2013

Role of plastic deformation on the efficiency of a nitriding treatment: modelling of the hardness-depth profile

L. Nosei
  • Fonction : Auteur
Jacky Lesage
  • Fonction : Auteur
  • PersonId : 832323
Jorge Feugeas
  • Fonction : Auteur

Résumé

To increase the hardness at the surface of ion-nitrided stainless steels, a plastic deformation by tensile test is performed previously to the nitriding treatment. This plastic deformation leads to an increase of the dislocation density which can be potentially used as diffusion paths for atoms. In this paper, influence of different plastic strain rates on the hardness variation close to the outer surface of the material is studied. However, the hardness-depth profile usually obtained from indentations performed on a cross-section of the sample is not consistent enough to represent the hardness variation very close to the outer surface, i.e. on distance lower than 20 µm. In order to obtain hardness values in the first twenty microns in depth, a simple model based on indentations performed at the modified surface is originally proposed. The predicted hardness-depth profile in different situations of work-hardening clearly demonstrates the efficiency of the prior plastic deformation on the global hardness improvement of the nitrided stainless steel. As a result, the thickness of the hardened layer varies between 20 µm to 35 µm when the plastic deformation rate increases from 0 to 80% of the maximum elongation rate. This hardness increase is attributed to the extension of the nitrided layer due to the augmentation of the dislocation density by the work-hardening process.
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Dates et versions

hal-00945890 , version 1 (13-02-2014)

Identifiants

  • HAL Id : hal-00945890 , version 1

Citer

Xavier Decoopman, L. Nosei, Jacky Lesage, Didier Chicot, Jorge Feugeas. Role of plastic deformation on the efficiency of a nitriding treatment: modelling of the hardness-depth profile. International Journal of Microstructure and Materials Properties, 2013, 8 (3), pp.155-170. ⟨hal-00945890⟩

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