Gaseous nitriding behaviour of 33CrMoV12-9 steel: evolution of the grain boundaries precipitation and influence on residual stress development
Article dans une revue avec comité de lecture
Date
2018Journal
Surface and Coatings TechnologyRésumé
The gaseous nitriding behaviour of 33CrMoV12-9 steel was investigated. The co-diffusion of nitrogen and carbon, precipitation at grain boundaries and mechanical properties evolutions (microhardness, residual stresses) are compared for several nitriding potentials, nitriding time and temperatures. While hardening unequivocally depends on the precipitation of alloying element nitrides MN (M = Cr, V…), the development of residual stresses follows phase transformation kinetics during nitriding. The transformation of carbides into nitrides is the limiting rate in the supersaturation of nitrogen in the ferritic matrix and the diffusion of the released carbon. The lower carbides transformation kinetics the smaller decarburization occurs during nitriding and residual stresses are more compressive. The kinetics is controlled by both the temperature and nitriding potential.
Fichier(s) constituant cette publication
Cette publication figure dans le(s) laboratoire(s) suivant(s)
Documents liés
Visualiser des documents liés par titre, auteur, créateur et sujet.
-
Article dans une revue avec comité de lectureThe evolution of residual stresses during short time gas nitriding of 33CrMoV12-9 steel grade is studied. It aims understanding the influence of nitriding parameters (temperature T and nitriding potential Kn) on the ...
-
Communication avec acteGaseous nitriding is controlled by temperature, time and surface nitrogen potential. Tuning these parameters lead to the expected mechanical properties (hardness, residual stresses) and durability of treated mechanical ...
-
Article dans une revue avec comité de lectureLa nitruration gazeuse est un traitement thermochimique contrôlée par la température, le temps et le potentiel azote superficiel qui influencent de façon notable les propriétés méca- niques (dureté, contraintes résiduelles) ...
-
Article dans une revue avec comité de lectureWEIL, Hadrien; COURLEUX, Alice; BECK, Guillaume; BARRALLIER, Laurent; JÉGOU, Sébastien (Materials Research Forum LLC, 2016)The objective of this work is to propose a model abled to optimize the mechanical properties from gaseous nitriding of steels (hardness, residual stresses) for a given loading and fatigue lifetime. Multiaxial fatigue ...
-
Optimization of gaseous nitriding of carbon iron-based alloy based on fatigue resistance modelling Article dans une revue avec comité de lectureWEIL, Hadrien; CALDEIRA-MEULNOTTE, Nancy; BECK, Guillaume; BARRALLIER, Laurent; JÉGOU, Sébastien (Elsevier, 2018)Gaseous nitriding of steels is a well-established thermochemical surface treat- ments that increases the fatigue resistance of treated parts. The present work proposes a modelling of the fatigue life as a function of the ...