Transition of phase transformation mechanism by mn addition in high nitrogen austenitic stainless steel

Norimitsu Koga, Michinori Fukuyama, Nobuo Nakada, Toshihiro Tsuchiyama, Setsuo Takaki

    Research output: Contribution to journalArticlepeer-review


    Fe-25Cr-1N-0, 2, 5Mn mass% alloys were subjected to isothermal heat treatment, and their microstructure formation and phase transformation behavior were investigated in order to clarify the effect of Mn addition on the transformation mechanism of high nitrogen austenite. Microstructure observation for the 1073 K heat-treated specimens revealed that the Fe-25Cr-1N alloy exhibited (α+Cr2N) lamellar eutectoid structure, while the Fe-25Cr-1N-2Mn and -5Mn alloys did finer (α′(or retained γ)+Cr2N) lamellar structure as well as (α+Cr2N) lamellar eutectoid structure. It was suggested that the (α′+Cr2N) lamellar structure had been formed through γ1→γ2+Cr2N cellular precipitation followed by martensitic transformation of γ2on cooling to ambient temperature. Nitrogen concentration in untransformed austenite in the Fe-25Cr-1N-2Mn and -5Mn alloys was continuously decreased with progressing of (γ+Cr2N) cellular precipitation due to nitrogen long-range diffusion from untransformed austenite to (γ+Cr2N) cellular structure. As a result of decreased nitrogen concentration in untransformed austenite, transformation mechanism switched from (γ+Cr2N) cellular precipitation to (α+Cr2N) eutectoid transformation.

    Original languageEnglish
    Pages (from-to)1165-1171
    Number of pages7
    JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    Issue number9
    Publication statusPublished - 2014

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Physical and Theoretical Chemistry
    • Metals and Alloys
    • Materials Chemistry


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