Abstract
Precipitation of fine alloy nitrides near the specimen surface results in significant surface hardening in nitriding of alloyed steels. In this study, a simulation model of alloy nitride precipitation during nitriding is developed for Fe-M binary system based upon the Kampmann–Wagner numerical model in order to predict variations in the distribution of precipitates with depth. The model can predict the number density, average radius, and volume fraction of alloy nitrides as a function of depth from the surface and nitriding time. By a comparison with the experimental observation in a nitrided Fe-Cr alloy, it was found that the model can predict successfully the observed particle distribution from the surface into depth when appropriate solubility of CrN, interfacial energy between CrN and α, and nitrogen flux at the surface are selected.
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Acknowledgments
Goro Miyamoto and Tadashi Furuhara gratefully acknowledge that this work was partly supported by JST-CREST Basic Research Program, “Creation of Innovative Functions of Intelligent Materials on the Basis of Element Strategy”.
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Manuscript submitted November 4, 2015.
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Tomio, Y., Miyamoto, G. & Furuhara, T. Precipitation Modeling in Nitriding in Fe-M Binary System. Metall Mater Trans A 47, 4970–4978 (2016). https://doi.org/10.1007/s11661-016-3674-5
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DOI: https://doi.org/10.1007/s11661-016-3674-5