Review on the Hall-Petch relation in ferritic steel

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

    28 被引用数 (Scopus)


    Yielding of polycrystalline low carbon steel is characterized by a clear yield point followed by unstable Lüders deformation and such a yielding behavior is taken over to fine grained steel with the grain size of 1μm or less. Yield strength of ferritic steel is increased with grain refinement standing on the Hall-Petch relation. The following equation is realized up to 0.2μm grain size in the relation between yield strength σy and grain size d: σy [MPa]= 100+600×d[μm] -1/2. In low carbon steel, it might be concluded that the Hall-Petch coefficient (ky) is around 600MPa·μm1/2. However, the ky value of interstitial free steels is substantially small as 130-180MPa·μm1/2 and it can be greatly increased by a small amount of solute carbon less than 20ppm. It was also cleared that the disappearance of yield point by purifying is due to the decrease in the k y value. On the other hand, the ky value is changeable depending on heat treatment conditions such as cooling condition from an elevated temperature and aging treatment at 90°C. These results suggest the contribution of carbon segregation at grain boundary in terms of the change in the ky value. On the contrary, substitutional elements such as Cr and Si do not give large influence to the ky value in comparison with the effect by carbon.

    出版ステータス出版済み - 8月 17 2010
    イベント7th Pacific Rim International Conference on Advanced Materials and Processing, PRICM-7 - Cairns, QLD, オーストラリア
    継続期間: 8月 2 20108月 6 2010


    名前Materials Science Forum


    その他7th Pacific Rim International Conference on Advanced Materials and Processing, PRICM-7
    CityCairns, QLD

    !!!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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