Abstract
A multiple analysis of a defective nitrided case has been used to investigate different parts of the over layer region. Experiments by means of X-ray photoelectron spectroscopy (XPS), electron probe microanalysis (EPMA), light microscopy and microhardness measurements were done at different scales and information was given on the structural and physico-chemical properties. The metallographic study allowed estimating the nitrided case depth together with hardness and nitrogen concentration profiles in depth. Also, the irregular nitrogen concentration and the irregular hardness profiles, in a parallel direction to the surface, were correlated with the structure features in the nitrided sample cross-section. One can notice a reasonable connection among the different results, which gives a good understanding of the defective nitrided sample.
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