Journal
JOURNAL OF MATERIALS SCIENCE
Volume 44, Issue 2, Pages 520-527Publisher
SPRINGER
DOI: 10.1007/s10853-008-3090-3
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The microstructure of the compound (white) layer formed on the surface of Fe-4wt.%V alloy, by nitriding in a gas mixture of ammonia and hydrogen at 580 A degrees C, has been investigated by employing light and scanning electron microscopy, X-ray diffraction and electron probe microanalysis. The compound layer is dominantly composed of gamma(|)-Fe4N nitride. Quantitative analysis of the composition data demonstrated that V is present in the compound layer as VN precipitates, i.e. V is not taken up significantly in (Fe, V) nitrides. A mechanism for compound-layer formation has been proposed.
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