Constrained Equilibrium Reactions in a Low Carbon Steel During Heat Treatments Below the MS
Felipe Manuel Castro Castro Cerda (Universidad de Santiago de Chile)
Constantinos Goulas (University of Twente)
E. I. Hernández (Universiteit Gent, Universidad de Santiago de Chile)
Juan P. Sanhueza (University of Concepcion)
Tanya Ros-Yanez (Cleveland-Cliffs Inc.)
R.H. Petrov (TU Delft - Team Maria Santofimia Navarro, Universiteit Gent)
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Abstract
Isothermal heat treatments below the martensite start temperature are carried out in a 0.25C-1.4Mn-1.4Si-0.32Mo steel (in wt%). The microstructural observation reveals a combination of tempered lath and plate martensite, accompanied by bainite and retained austenite. The temperature variation of the austenitic carbon content under different constrained equilibrium models is calculated and compared with experimental measurements. Neither of the existing models seems to predict the behavior of the measured austenitic carbon content in the temperature range studied. The results suggest that the diffusional formation of bainite governs the carbon content of austenite at temperatures nearby the MS.