Contribution of soft cu particles to tensile deformation behavior in iron

Yuta Imanami, Masahiro Murakami, Nobuo Nakada, Toshihiro Tsuchiyama, Setsuo Takaki

    研究成果: 書籍/レポート タイプへの寄稿会議への寄与

    抄録

    Dispersion strengthening is one of the most cffcctivc strengthening methods in metals. In particular, many kinds of hard particles, such as carbide and oxide, have been applied as dispersed particle in structural steel. On the other hand, precipitation of Cu, which is softer than the ferritc matrix, also draws attention as dispersed particle for strengthening, because nano-sized Cu particles arc easily dispersed uniformly by aging heat treatment within matrix, and besides, its Ostwald growth ripening is very slow. In this study, Cu and VC-dispcrsed ferritic steels with an identical yield strength were prepared, and then subjected to tensile testing and cold rolling in order to compare the effects of soft Cu and hard carbide (VC) particles on tensile deformation behavior of iron. As a result, Cu-dispcrscd steel exhibited lower work hardening rate and larger elongation. In particular, the local elongation is significantly larger than VC-dispersed steel. TEM observation reveals that the shape of VC within ferritc matrix is unchanged even after severe cold deformation and that tangled dislocation structure develops around VC panicles. This leads to the large work hardening rate is formed in carbide-dispersed steel. On the contrary. Cu particles were clearly elongated along the deformation direction with own plastic deformation in high strain region. For example, the average aspect ratio of the deformed Cu particles was elongated up to 7.2 after 70% cold rolling. In addition, tangled dislocation was hardly observed around the particles. Therefore, it is concluded that the large local elongation of Cu-dispcrscd steel is derived from the plastic deformation of Cu particles resulting in the reduction of the stress concentration at (ferritc / particle) interface and the formation of a void there.

    本文言語英語
    ホスト出版物のタイトルProceedings of the 17th IFHTSE Congress
    出版社The Japan Society for Heat Treatment (JSHT)
    ページ526-528
    ページ数3
    ISBN(電子版)9780000000002
    出版ステータス出版済み - 1月 1 2008
    イベント17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008 - Kobe, 日本
    継続期間: 10月 26 200810月 28 2008

    出版物シリーズ

    名前Proceedings of the 17th IFHTSE Congress
    2

    その他

    その他17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008
    国/地域日本
    CityKobe
    Period10/26/0810/28/08

    !!!All Science Journal Classification (ASJC) codes

    • 表面、皮膜および薄膜
    • 凝縮系物理学
    • 材料力学

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