Abstract

Extended X-ray absorption fine structure spectroscopy (EXAFS) was performed for localizing nitrogen atoms in two austenitic steels, such as X5CrNi 1810 (AISI 304) and X5CrNiMo 18 8 3 (AISI 316), as well as in the ferritic steel X20CrMo 9 1 in the as-received condition and after salt bath nitriding. The evaluation of the EXAFS data revealed structural distortions in the neighbourhood of the alloying elements caused by interstitially dissolved nitrogen atoms, The strongest lattice distortions were detected around Cr and Mo atoms. This indicates that the stable nitride forming elements Cr and Mo are favourable hosts for nitrogen atoms

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