Abstract
The high temperature phase relations in the FeMnC system have been analyzed in light of the recently developed thermodynamic method by the authors to obtain the Gibbs energies of formation of Mn 23C 6 and Mn,C. A new thermodyn/amic treatment is outlined and applied to obtain the stability of the ternary carbide M(Fe,Mn) 3C without any a priori assumption of a solution model for the M 3C phase. The recommended Gibbs energies of formation for the Mn carbides, Mn 3C and Mn 23C 6 With γ-Mn (graphite) as the Standard states are: Δ G 0 Mn 3 C =−16.9−0.015 T kJ 1243≤ T≤1323 K Δ G 0 Mn 23 C 6 =−133.7−0.090 T kJ 873≤ T≤1273 K The present method can be extended to obtain a consistent set of thermodynamic data for binary and ternary carbides from various ternary metal-metal-carbon phase relations.
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