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Thermodynamic calculation of phase diagrams in the iron‐nitrogen system

1986; Wiley; Volume: 57; Issue: 8 Linguagem: Inglês

10.1002/srin.198600783

0177-4832

J. Kunze,

Thermal and Kinetic Analysis

On the basis of recent measurements of the equilibria between N 2 and NH 3 containing gas atmospheres, respectively, and of the nitrogen solved in the α, γ and ε iron phases a thermodynamic analysis of the Fe—N system has been carried out. The Gibbs free energy of the γ, ε transformation of pure iron was derived. The composition Fe 4.3 N was calculated concerning the γ’ phase above 593°C. The phase boundaries were stated as temperature functions of the N 2 equilibrium pressures. The resulting phase diagram shows the stability regions of the α, γ, γ’ and ε phases and an α/γ/ε triple point which corresponds to that of the pure iron.