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EXAFS investigation of low temperature nitrided stainless steel

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Abstract

Low temperature nitrided stainless steel AISI 316 flakes were investigated with EXAFS and X-ray diffraction analysis. The stainless steel flakes were transformed into a mixture of nitrogen expanded austenite and nitride phases. Two treatments were carried out yielding different overall nitrogen contents: (1) nitriding in pure NH3 and (2) nitriding in pure NH3 followed by reduction in H2. The majority of the Cr atoms in the stainless steel after treatment 1 and 2 was associated with a nitrogen–chromium bond distance comparable to that of the chemical compound CrN. The possibility of the occurrence of mixed substitutional–interstitial atom clusters or coherent nitride platelets in nitrogen-expanded austenite is discussed.

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Notes

  1. It is likely that Ni and Cr dissolve in the iron nitrides γ′ and ε, respectively.

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Acknowledgement

Financial support of the Danish Research Council for Technology and Production Sciences under grant 274-05-0230 is gratefully acknowledged.

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Correspondence to Thomas L. Christiansen.

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Oddershede, J., Christiansen, T.L., Ståhl, K. et al. EXAFS investigation of low temperature nitrided stainless steel. J Mater Sci 43, 5358–5367 (2008). https://doi.org/10.1007/s10853-008-2791-y

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  • DOI: https://doi.org/10.1007/s10853-008-2791-y

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