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PetroMat

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COMPOSITION AND STRUCTURE OF IRON-CHROMIUM CARBOXINITRIDE

IRON-CHROMIUM ALLOYS PLATES WERE HEATED AT 840 K IN FUSED SALT BATHS WITH HIGH ALKALINE CYANATE CONTENTS. LONG-TERM HEAT TREATMENT UNDER THESE CONDITIONS LED TO THE FORMATION OF A(FE,CR) (C,O,N) PHASE ON THE SURFACE OF THE SPECIMEN. THE CHARACTERISTICS OF THE PHASE WERE INVESTIGATED BY X-RAY DIFFRACTION ANALYSIS, MICROPROBE DETERMINATION AND CHEMICAL ANALYSIS. THE PHASE HAS A CUBIC (NACL TYPE) UNIT CELL WITH A LATTICE PARAMETER INTERMEDIATE BETWEEN THOSE OF CRN AND WUSTITE.AS IN THE CASE OF WUSTITE, THE STRUCTURE IS IRON-DEFICIENT AND BECOMES MUCH MORE SO AS OXYGEN IS ADDED.

The influence of carbon on nitrogen substitution in iron ε -phases

Mössbauer spectroscopy of nitrided and carbonitrided iron powders and plates with total interstitial atom contents of between 24 and 33 at% has allowed the variation with composition of the hyperfine magnetic fields of metal atoms with 2 or 3 close interstitial atoms to be determined. Fe atoms with three non-metal nearest neighbours and paramagnetic behaviour have also been detected. Only when the content of non-metal atoms goes beyond 30 at%, do Fe atoms in ε-carbonitrides display higher magnetic fields than in the corresponding ε-nitrides.

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