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Thermodynamic analysis and evaluation of the Fe-Cr-Mn-N system

In the present work, the thermodynamic properties of the Fe-Cr-Mn-N system have been studied using models for Gibbs energy of its various phases after combining recent descriptions of the Fe-Cr-Mn, Fe-Cr-N, Fe-Mn-N, and Cr-Mn-N systems. Close attention is paid to the solubility of N in the Fe-Cr-Mn liquid, face-centered cubic (fcc), and body-centered cubic (bcc) phases and precipitation of the hexagonal close-packed (hcp) nitride (i.e., Cr 2 N) from fcc at various conditions. In addition, the properties of the Fe-Cr-Mn hcp phase referred to as martensite were assessed by comparing the calculated T 0 temperature between fcc and hcp with experimental martensitic transformation temperatures A s and M s