A criterion for the change from fast to slow regime of cementite dissolution in Fe-C-Mn steels

Mohamed Gouné (1, 2) , Philippe Maugis (3) , J. Drillet (1)

1 ArcelorMittal Maizières Research SA
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
3 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence

The present study clarifies the role of Mn in cementite on the driving force of cementite dissolution and the growth of austenite. From an experimental study, the effects of manganese composition and temperature on the cementite dissolution were shown. From a theoretical analysis based on thermodynamic and kinetics considerations, a criterion for the change from fast to slow regime of cementite dissolution was proposed. This criterion is in good agreement with the experimental results. It can be easily calculated and can define the composition and temperature ranges where the cementite dissolution is slow or fast.

Mots clés: Phase transformation; Thermodynamics; Kinetics; Cementite dissolution; Steel

Domaines: Matériaux

Mohamed Gouné, Philippe Maugis, J. Drillet. A criterion for the change from fast to slow regime of cementite dissolution in Fe-C-Mn steels. Journal of Materials Science and Technology, 2012, 23 (8), pp.728-236. ⟨10.1016/s1005-0302(12)60122-4⟩. ⟨hal-00731162⟩