Results of previous statistical thermodynamic analysis appeared to imply that N atoms in molten Fe1−yCry (0·05<y<0·2) are trapped in octahedral voids (O-sites) surrounded by one Cr atom and five Fe atoms. However, previous work did not include development of a statistical model for molten Fe1−yCryNx-with higher Cr content. In the present work, available equilibrium nitrogen pressure–temperature–composition relationships for molten Fe1−yCryNx were analysed in the composition range 0·4≤y≤0·9. The results of the present analysis appeared to suggest that in this composition range O-sites surrounded by four Cr atoms and two Fe atoms provide the trapping sites for N atoms.
MST/721
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