Optimization of gaseous nitriding of steels by multi-physics modelling
TypeCommunications avec actes
Gaseous 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 parts. In this paper, a methodology is proposed to optimize nitriding parameters by using a multi-physics modelling of the nitriding treatment (microstructure, diffusion/precipitation mechanisms, hardness and residual stress generation). This model is particularly suited to the diffusion layer and does not apply to the compound layer. The scope concerns low-alloyed carbon steels and gaseous nitriding. The role of carbon is established and taken into account in the proposed methodology.
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Gaseous nitriding behaviour of 33CrMoV12-9 steel: evolution of the grain boundaries precipitation and influence on residual stress development JEGOU, Sébastien; BARRALLIER, Laurent; FALLOT, Guillaume (Elsevier, 2018)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 ...
Optimization of gaseous nitriding of carbon iron-based alloy based on fatigue resistance modelling WEIL, Hadrien; BARRALLIER, Laurent; JEGOU, Sébastien; CALDEIRA-MEULNOTTE, Nancy; BECK, Guillaume (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 ...
FALLOT, Guillaume; JEGOU, Sébastien; BARRALLIER, Laurent (2014)The 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 ...
WEIL, Hadrien; JEGOU, Sébastien; BARRALLIER, Laurent; COURLEUX, Alice; BECK, Guillaume (2015)Le but de cette étude est de mettre en place un modèle de calcul en fatigue prenant en compte les caractéristiques mécaniques d’un matériau nitruré. Le travail est réalisé sur acier de nuance 32CrMoV13 utilisé dans la ...
WEIL, Hadrien; JEGOU, Sébastien; BARRALLIER, Laurent; COURLEUX, Alice; BECK, Guillaume (2016)The present study aims to develop an algorithm able to predict the fatigue lifetime of nitrided steels. Linear multi-axial fatigue criteria are used to take into account the gradients of mechanical properties provided by ...