Theoretical discussion of dislocation strengthening in cold rolled iron

Setsuo Takaki, Toshihiro Tsuchiyama

    研究成果: ジャーナルへの寄稿学術誌査読

    6 被引用数 (Scopus)


    In work hardened metals, it is known that the strength of metals is heightened with increasing dislocation density. In the case of cold worked iron, dislocation is introduced heterogeneously and forms dislocation cell structure. Yield stress increases with an increase of volume fraction of cell wall where dislocation density ρ is much higher than the matrix. Applying the composite model to cold worked iron with dislocation cell structure, it was theoretically explained that linear relationship is realized between √ ρ and the increment of strength δs, so called Bailey-Hirsch relation. On the other hand, the Bailey-Hirsch equation; δs[GPa]=18√ρ/109 was constructed from the experimental data which were already reported for cold worked iron. In previous papers, dislocation density was measured directly by transmission electron microscopy. As a result, it was confirmed that experimental data agree well with the result which was theoretically introduced based on the composite model and that the above Bailey-Hirsch equation can be applied for cold worked iron in which dislocation density is below 4×1014/m2 at least.

    ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    出版ステータス出版済み - 2018

    !!!All Science Journal Classification (ASJC) codes

    • 凝縮系物理学
    • 物理化学および理論化学
    • 金属および合金
    • 材料化学


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