Decomposition of austenite in Fe-25Cr-1N alloy produced by solution nitriding

Toshihiro Tsuchiyma, N. Hirakawa, N. Nakada, S. Takaki

    研究成果: 書籍/レポート タイプへの寄稿会議への寄与

    2 被引用数 (Scopus)

    抄録

    The nickel-free austenitic stainless steel produced by solution nitriding (Fe-25%Cr-1%N alloy) was subjected to isothermal heat treatment, and then the microstructure formed through the decomposition of austenite was investigated in terms of the morphology of eutectoid structure and the size of eutectoid block. On the isothermal heat treatment at 873K-1223K for the solution-nitrided steel, the austenite decomposed to eutectoid structure composed of ferrite and Cr 2N nitride. This transformation could be completely finished after long time heat treatment in the above temperature range. The nose temperature of T.T.T. curve was around 1173K, and the time to start the eutectoid transformation was only 100-200s. The eutectoid structure was formed mainly along austenite grain boundaries and then grew into the untransformed austenite region. Finally, the austenite was completely decomposed into ferrite and Cr2N nitride. As a result of OIM observation for the specimen after isothermal heat treatment, the eutectoid structure was found to be divided into small-sized ferrite blocks, in which lamellar Cr2N plates were finely distributed. The block size and the mean ferrite path of eutectoid structure were decreased with lowering the heat treatment temperature. In the 873K heat-treated material, these values were estimated at 20 microns and 0.1 microns, respectively.

    本文言語英語
    ホスト出版物のタイトルSupplement to THERMEC 2006, 5th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2006
    ページ4950-4955
    ページ数6
    539-543
    PART 5
    出版ステータス出版済み - 2007
    イベント5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006 - Vancouver, カナダ
    継続期間: 7月 4 20067月 8 2006

    出版物シリーズ

    名前Materials Science Forum
    番号PART 5
    539-543
    ISSN(印刷版)02555476

    その他

    その他5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006
    国/地域カナダ
    CityVancouver
    Period7/4/067/8/06

    !!!All Science Journal Classification (ASJC) codes

    • 材料科学(全般)
    • 凝縮系物理学
    • 材料力学
    • 機械工学

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