Abstract
Nitride precipitation and resultant surface hardening in nitrided Fe-M1-M2 ternary alloys containing Cr, Al, or V were investigated using transmission electron microscopy and three-dimensional atom probe tomography. The (Al, Cr) and (Cr, V) mixed nitrides are formed by the co-precipitation of these elements during the nitriding of Fe-Al-Cr or Fe-Cr-V alloys. However, the precipitation of V nitrides precedes Al nitride precipitation during the nitriding of the Fe-Al-V alloy, which results in two-step hardening behavior. The addition of Cr or V to the Fe-Al alloy accelerates the precipitation kinetics of Al nitrides by promoting the nucleation of Al nitrides, which leads to substantial surface hardening.
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Acknowledgments
This work was carried out as a part of the CREST Basic Research Program, “Creation of Innovative Functions of Intelligent Materials on the Basis of Element Strategy.” T.F. and G.M. gratefully acknowledge the financial support provided by the Ministry of Education, Culture, Sports, Science and Technology through Grants-in-Aid for challenging Exploratory Research (Nos. 25630321 and 24656397). The authors are grateful to Mr. Narita of Cooperative Research and Development Center for Advanced Materials, Institute for Materials Research, Tohoku University, for assistance with the FE-EPMA measurements. G.M. also gratefully acknowledges the financial support provided by the Integrated Materials Research Center for a Low-Carbon Society (LC-IMR).
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Manuscript submitted January 30, 2015.
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Miyamoto, G., Suetsugu, S., Shinbo, K. et al. Surface Hardening and Nitride Precipitation in the Nitriding of Fe-M1-M2 Ternary Alloys Containing Al, V, or Cr. Metall Mater Trans A 46, 5011–5020 (2015). https://doi.org/10.1007/s11661-015-3133-8
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DOI: https://doi.org/10.1007/s11661-015-3133-8