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The until now controversially discussed existence of the two-phase equilibrium α-Fe + ∊-Fe 3 (N, C) 1 +x in the ternary system Fe – N – C was proven by the investigation (optical microscopy, X-ray diffraction, Electron Backscatter Diffraction) of compound-layer microstructures generated by gaseous nitrocarburising of pure iron and subsequent secondary annealing experiments under static inert-gas atmosphere. The invariant transition reaction γ-Fe 4 N + Fe 3 C → α-Fe + ∊-Fe 3 (N, C) 1 +x could be shown to proceed at a (single) temperature (at constant pressure of 1 atm) between 833 K and 843 K.

international journal of materials research

Examination of phase transformations in the system Fe–N–C by means of nitrocarburising reactions and secondary annealing experiments; the α + ∊ two-phase equilibrium