Investigations of nitrogen diffusion in austenitic CrNi steels |
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Authors: | Andrea Kühl Dietrich Bergner Hans-J. Ullrich Matthias Schlaubitz Peter Karduck |
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Affiliation: | (1) Bergakademie Freiberg, Institut für Metallkunde, G.-Zeuner-Strasse 5, D-O-9200 Freiberg, Federal Republic of Germany;(2) Institut für Werkstoffwissenschaft, TU Dresden, Federal Republic of Germany;(3) Gemeinschaftslabor für Elektronenmikroskopie, RWTH Aachen, Federal Republic of Germany |
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Abstract: | Parameters of the diffusion of N (up to 0.3 wt.%) in austenitic stainless steels (12 to 19 wt.% Cr, 12 to 16 wt.% Ni, up to 2 wt.% Mo) were determined within the temperature range of 1283–1573K. The small concentration gradients of N were successfully investigated using (1) mechanical serial sectioning technique in combination with either chemical N analysis or X-ray precision lattice parameter determination, and (2) measurements on microsections by means of either electron probe microanalysis or Kossel technique.The diffusion coefficients of N were found to be independent of its concentration. The alloying elements Cr and Mo reduce the N diffusivity in austenitic stainless steels which on the other hand is increased by Ni. |
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Keywords: | austenitic CrNi(Mo) steels N interdiffusion electron probe microanalysis divergent beam (Kossel) X-ray technique |
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