Difference in martensitic transformation behavior between carbon- and nitrogen-added metastable austenitic stainless steels

Takuro Masumura, Nobuo Nakada, Toshihiro Tsuchiyama, Setsuo Takaki, Tamotsu Koyano, Kazuhiko Adachi

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    In order to evaluate the effects of carbon and nitrogen additions on the stability of austenite, athermal and deformation-induced α'-martensitic transformation behaviors were investigated in type 304 metastable austenitic stainless steels containing 0.1 mass% carbon or nitrogen. Since carbon-added steel has a lower stacking-fault energy (SFE) than nitrogen-added steel, deformation-twin and e-martensite were preferentially formed in carbon-added steel, whereas a dislocation cell structure developed in nitrogen-added steel. Crystallographic analysis using electron backscatter diffraction method revealed that the difference in the deformation microstructure has a significant influence on the growth behavior of deformation-induced α'-martensite. The interface of the deformation-twin and e-martensite completely suppress the growth of α'-martensite, whereas dislocation cell boundaries have little influence on that. As a result, the mechanical stability of carbon-added steel is slightly higher than that of nitrogen-added steel, although the thermal stabilization effect of carbon is much lower than that of nitrogen.

    Original languageEnglish
    Title of host publicationPTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
    EditorsLong-Qing Chen, Matthias Militzer, Gianluigi Botton, James Howe, Chadwick Sinclair, Hatem Zurob
    PublisherInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
    Pages591-592
    Number of pages2
    ISBN (Electronic)9780692437360
    Publication statusPublished - Jan 1 2015
    EventInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015 - Whistler, Canada
    Duration: Jun 28 2015Jul 3 2015

    Publication series

    NamePTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015

    Other

    OtherInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015
    Country/TerritoryCanada
    CityWhistler
    Period6/28/157/3/15

    All Science Journal Classification (ASJC) codes

    • Chemical Engineering(all)
    • Inorganic Chemistry
    • Materials Chemistry
    • Metals and Alloys

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