Abstract
The internal friction of 22 Fe-Mn-N alloys with 0 to 2 pct Mh and 23 to 170 ppm N was measured at 1 Hz and temperatures between 220 and 525 K. The Snoek spectra were resolved into sets of Debye peaks of heightp i. This resolution was accomplished with five independent sets of Debye parameters (number of peaks, activation energies, and peak temperatures), which were obtained from the literature. The five resulting sets ofp i were correlated with the chemically determined nitrogen (Nch) by multiple regression analyses. A high degree of correlation was obtained with all five sets of parameters. For ease of calculation, we recommend resolving the spectra into the three Debye peaks determined by Couper and Kennedy. The regression equation obtained by applying these parameters was Nch (ppm) = 11.9 + 2.33p 1 + 0.83p 2 + 0.75p 3 with a standard error of estimate of 6.8 ppm. The first term on the right-hand side was interpreted as nitrogen precipitated by traces of refractory metals. The sum of the last three terms on the right was interpreted as the total nitrogen in solution. A procedure for determining total nitrogen in solution in Fe-Mn-N alloys is recommended and described in detail.
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Stephenson, E.T. Determination of total nitrogen in solution in Fe-Mn-N alloys by internal friction. Metall Trans 5, 1987–1992 (1974). https://doi.org/10.1007/BF02644490
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DOI: https://doi.org/10.1007/BF02644490