Evolution of residual stress in the diffusion zone of a model Fe-Cr-C alloy during nitriding
Article dans une revue avec comité de lecture
Date
2011Journal
Journal of heat treatment and materialsRésumé
Development and evolution of compressive residual stress during nitriding treatment are studied. A model carbon iron-based alloy Fe-3wt.%Cr-0.35wt.%C was nitrided in gas at 550 °C for different times. Microstructural investigation indicated an influence of the transformation and the associated carbon diffusion on the in-situ relaxation of residual stress induced by nitride precipitation. The transformation of initially present carbides into nitrides and the associated carbon accumulation ahead of the nitriding front is particularly taken into account. The distribution of residual stress in the nitrided case was predicted with a self-consistent mechanical model, using the volume changes associated with the phase transformations. To this end the nitrogen and carbon concentration distributions were converted into the equilibrium phase fractions of carbides and nitrides. An excellent correlation was obtained between experimental (X-ray diffraction analysis) and, thus, calculated independent residual stress distributions in the ferrite matrix.
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Evolution des contraintes résiduelles dans la couche de diffusion d’un acier modèle Fe-Cr-C nitruré Article dans une revue avec comité de lectureJEGOU, Sébastien; KUBLER, Régis; SOMERS, Marcel; BARRALLIER, Laurent (Pyc Edition, 2011)Limiter la fatigue et la corrosion des pièces est possible grâce à une nitruration. Des contraintes résiduelles en découlent. Le rôle de la diffusion du carbone sur le développement de ces contraintes a été étudié sur un ...
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Article dans une revue avec comité de lectureJEGOU, Sébastien; KUBLER, Régis; BARRALLIER, Laurent (Trans Tech Publications Inc, 2011)Nitriding is a well-established thermochemical surface treatment of carbon micro-alloyed steels aiming enhancing surface properties such as fatigue, wear and corrosion resistances. The idea is taking benefits from the high ...
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Communication avec acteJEGOU, Sébastien; KUBLER, Régis; ROCH, François; BARRALLIER, Laurent (2009)Nitriding of steels is an important treatment in duplex hardening methods. This treatment is known in the art but some advances still need to be done in terms of residual stress understanding. Although residual stresses ...
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Article dans une revue avec comité de lectureJEGOU, Sébastien; KUBLER, Régis; BARRALLIER, Laurent (Elsevier, 2010)Phase transformations during nitriding of a ternary carbon iron-based alloy Fe–3%Cr–0.345%C were studied, aiming for a better understanding of residual stresses generation and evolution. The relationship between the ...
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Article dans une revue avec comité de lectureJEGOU, Sébastien; KUBLER, Régis; BARRALLIER, Laurent (Trans Tech Publications, 2010)This work deals with the development of residual stresses during nitriding of steels. The main features of a chemico-thermo-mechanical model of nitriding are presented. A micro-macro approach is applied based on volume ...