Abstract
Two modified X120Mn12 Hadfield steels, differing in the amount of the alloying elements Al and N, are analyzed with respect to AlN precipitation and its effects on ductility. Charpy impact tests are performed, demonstrating the loss of ductility in the one grade containing a high density of AlN precipitates. The characterization of the precipitates is carried out by high-resolution scanning electron microscopy (HRSEM). Depending on chemical composition, primary and secondary AlN precipitates are detected on prior austenite grain boundaries and within the bulk volume. The experimental observations are confirmed by thermokinetic simulations, using the software package MatCalc (Vienna University of Technology, Vienna, Austria).
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Notes
The effective volume misfit of AlN at dislocations, originally determined with 0.19 in Ref. 40 must be replaced by 0.27 when using MatCalc versions 5.40 and higher. The misfit value has erroneously been taken twice in older versions.
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Financial support by the companies VAE GmbH and VAE Eisenbahnsysteme GmbH is acknowledged gratefully.
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Manuscript submitted January 18, 2011.
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Radis, R., Schlacher, C., Kozeschnik, E. et al. Loss of Ductility Caused by AlN Precipitation in Hadfield Steel. Metall Mater Trans A 43, 1132–1139 (2012). https://doi.org/10.1007/s11661-011-0968-5
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DOI: https://doi.org/10.1007/s11661-011-0968-5