Microstructures and mechanical properties in ultra fine-grained oxide-dispersion ferritic stainless steels

Yuuji Kimura, Shinich Suejima, Hideto Goto, Setsuo Takaki

    研究成果: ジャーナルへの寄稿学術誌査読

    32 被引用数 (Scopus)

    抄録

    Microstructures and mechanical properties were investigated in ultra fine-grained oxide-dispersion steels with 24 mass% Cr ferrite matrix fabricated from mechanical milled powders. Powder mixtures of Fe, Cr and Y2O3 were mechanically milled in an argon gas atmosphere and then consolidated at around 1100 K. After 720 ks mechanical milling (MM), nanocrystalline ferrite grain structures were formed within powder particles. As for Y2O3 particles, it was observed that they were not only crushed to several nanometers but also decomposed during MM, and then oxides like Y2O3 and YCrO3 finely precipitated in ultra fine grained structure on annealing at around 1200 K. Such ultra fine oxide particles effectively retarded the growth of matrix grains. The sample with 1 vol.% Y2O3 addition maintained ultra fine ferrite grains of 0.4 μm even after the annealing of 1573 K-3.6 ks by the Zener pinning effect of the oxide particles of about 10 nm in diameter. Tensile strength of the bulk samples markedly rose as the ferrite grain size became smaller in the grain size range below 1 μm and reached 1.93 GPa for the bulk sample with 1 vol.% Y2O3 addition and with the smallest mean grain size of 0.16 μm.

    本文言語英語
    ページ(範囲)S174-S178
    ジャーナルisij international
    40
    SUPPL.
    DOI
    出版ステータス出版済み - 2000

    !!!All Science Journal Classification (ASJC) codes

    • 材料力学
    • 機械工学
    • 金属および合金
    • 材料化学

    フィンガープリント

    「Microstructures and mechanical properties in ultra fine-grained oxide-dispersion ferritic stainless steels」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

    引用スタイル