Discussion of the solid solution hardening mechanism of phosphorus in steel

Kei Sakata, Kaneharu Okuda, Osamu Furukimi

    研究成果: ジャーナルへの寄稿学術誌査読

    6 被引用数 (Scopus)

    抄録

    Phosphorus (P), which is widely used as solid solution hardening clement in ultra-low carbon interstitial free (IF) steel, often exhibits unpreferable increment of yield strength. In this study, the influence of phosphorus on yielding characteristics in IF steel by focusing the segregation behavior of P to grain boundary. Higher P addition shows normally higher yield elongation compared to its lower addition, leading to relatively high yield strength when the steel is subjected to conventional recrystallization annealing. On the other hand, when additional heat treatment at 700°C is employed, the yield strength of the high P added steel can be significantly reduced. This corresponds to the reduction of the k-value of the Hall-Petch equation. This phenomena is well related to the segregation characteristics of P at grain boundary. Segregated P may induce to a sort of structural change of the grain boundary of steel, resulting in lowering the yield strength. The equilibrium estimation of the segregated P content by considering the grain diameter can lead to considerably good agreement with the experimental data obtained in this study.

    本文言語英語
    ページ(範囲)26-32
    ページ数7
    ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    84
    8
    DOI
    出版ステータス出版済み - 1998

    !!!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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