Morphology and constitution of the compound layer formed on nitrided Fe–4wt.%V alloy
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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 °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 γ|-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.
KeywordsCompound Layer Diffusion Zone White Layer Ferrite Matrix Excess Nitrogen
The authors are grateful to Mr. P. Kress for assistance with the nitriding experiments and especially to Mrs. S. Haug for carrying out the electron probe microanalysis measurements.
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