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Plasma Nitriding Behavior of Fe-C-M (M = Al, Cr, Mn, Si) Ternary Martensitic Steels

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An Erratum to this article was published on 19 November 2013

Abstract

Change in surface hardness and nitrides precipitated in Fe-0.6C binary and Fe-0.6 mass pct C-1 mass pct M (M = Al, Cr, Mn, Si) ternary martensitic alloys during plasma nitriding were investigated. Surface hardness was hardly increased in the Fe-0.6C binary alloy and slightly increased in Fe-0.6C-1Mn and Fe-0.6C-1Si alloys. On the other hand, it was largely increased in Fe-0.6C-1Al and Fe-0.6C-1Cr alloys. In all the Fe-0.6C-1M alloys except for the Si-added alloy, fine platelet alloy nitrides precipitated inside martensite laths. In the Fe-0.6C-1Si alloy, Si-enriched film was observed mainly at a grain boundary and an interface between cementite and matrix. Crystal structure of nitrides observed in the martensitic alloys was similar to those in Fe-M binary ferritic alloys reported previously. However, there was a difference in hardening behavior between ferrite and martensite due to a high density of dislocations acting as a nucleation site of the nitrides and partitioning of an alloying element between martensite and cementite changing the driving force of precipitation of the nitrides.

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Acknowledgments

The financial supports from Global COE program of Materials Integration International Center of Education Research in Tohoku University (Y.T.) and the Iron and Steel Institute of Japan (T.F.) are gratefully acknowledged throughout this research. T.F. also thanks sincerely to partial support by Japan Science and Technology Agency through the Core Research for Evolutional Science & Technology (CREST) program.

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Correspondence to Tadashi Furuhara.

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Manuscript submitted February 16, 2013.

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Tomio, Y., Kitsuya, S., Oh-ishi, K. et al. Plasma Nitriding Behavior of Fe-C-M (M = Al, Cr, Mn, Si) Ternary Martensitic Steels. Metall Mater Trans A 45, 239–249 (2014). https://doi.org/10.1007/s11661-013-1991-5

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  • DOI: https://doi.org/10.1007/s11661-013-1991-5

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