Carburization of austenitic and ferritic stainless steels in liquid sodium: Comparison between experimental observations and simulations

Marie Michelle Romedenne , Fabien Rouillard , Didier Hamon , Benoît Malard (1) , Daniel Monceau (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Three steels were exposed in carburizing sodium at 600 and 650 °C. The kinetics and extent of carburization were characterized. Numerical simulations using the coupled thermodynamic-kinetic modeling software DICTRA were performed. It was proposed that the observed carbon diffusion profiles were induced by the combined diffusion of carbon in the grains and at grain boundaries coupled with the slow formation of carbides. The blocking effect of carbides on the carbon diffusion was observed to evolve as a function of time and microstructure. Acceptable agreement between experimental and simulated intragranular carbon profiles was achieved by optimizing the labyrinth factor and phases.

Mots clés: Stainless steels; Carburization; EPMA; X-ray diffraction; Modelling studies

Domaines: Matériaux

Marie Michelle Romedenne, Fabien Rouillard, Didier Hamon, Benoît Malard, Daniel Monceau. Carburization of austenitic and ferritic stainless steels in liquid sodium: Comparison between experimental observations and simulations. Corrosion Science, 2019, 159, pp.108147. ⟨10.1016/j.corsci.2019.108147⟩. ⟨hal-02388742⟩