Phases Equilibrium Study In Quaternary Iron-Rich Fe-Al-Mn-C Alloys

High aluminium low manganese steels were elaborated in order to study the phase equilibrium in the range of 900-1 100 degrees C. Two different quaternary alloys have been studied (Fe-9 to 10wt%Al-1.7wt%Mn-0.2wt%C and Fe-9 to 10wt%Al-8wt%Mn-0.2wt%C). Equilibrium phase's nature was identified at four temperatures for two alloys. Equilibrium phase fraction and chemical compositions were determined at 900 degrees C. Thanks to these equilibrium results, we tried to understand the non-equilibrium microstructure observed after different thermal histories (DTA cycles, isothermal treatment followed by quench, reception state) and identify DTA events in a coherent way.