Alloying-element interactions with austenite/martensite interface during quenching and partitioning of a model Fe-C-Mn-Si alloy

Mohamed Gouné (1) , Samy Aoued (1) , Frédéric Danoix (2) , Guillaume Geandier (3) , Angeline Poulon-Quintin (1) , Jean-Christophe Hell (4) , Michel Soler (4) , Sébastien Allain (3)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 GPM - Groupe de physique des matériaux
3 IJL - Institut Jean Lamour
4 ArcelorMittal Maizières Research SA

The alloying elements partitioning from martensite to austenite during quenching and partitioning was analysed by coupling in situ High Energy X-Ray Diffraction experiments and 3D atom probe tomography. A rapid and significant carbon partitioning from martensite to austenite without any partitioning of both Mn and Si was highlighted while the interface was immobile. After a relatively short time at 400 °C, a clear Mn partitioning occurs at the vicinity of the α′/γ interface. The analysis conducted indicates that manganese equilibrates its chemical potential during partitioning and raises the issue of the Constrained Carbon Equilibrium model applicability throughout the partitioning process.

Mots clés: Steels; Quenching and partitioning; Partitioning; High Energy; X-Ray Diffraction; Atom probe tomography

Domaines: Matériaux

Mohamed Gouné, Samy Aoued, Frédéric Danoix, Guillaume Geandier, Angeline Poulon-Quintin, et al.. Alloying-element interactions with austenite/martensite interface during quenching and partitioning of a model Fe-C-Mn-Si alloy. Scripta Materialia, 2019, 162, pp.181-184. ⟨10.1016/j.scriptamat.2018.11.012⟩. ⟨hal-01945700⟩