Formation mechanism of oxide particles in subscale layer around surface cracks of steel

Yasuhide Ohba, Yuki Yamashita, Ko Ichiro Ohno, Takayuki Maeda, Koki Nishioka, Masakata Shimizu

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)


    Since there are many generation factors for surface cracks on steel products manufactured by the processes of continuous casting through billet rolling, it is important for their prevention to identify the process where the surface cracks are generated. In this study, the formation mechanism of the oxide particles in the subscale layer around surface cracks of steel products was investigated towards establishing an estimation method of crack generation temperature. It was found that, the average radius leveled off corresponding with its exposed temperature after enough holding time. The average radiuses were 0.2 μm and 0.3μm for 1473K and 1573K, respectively. Those oxide particles were consisted of MnO SiO2 and MnO Cr2O 3 phases. Their formation and growth mechanism was as follows: Firstly, MnO-SiO2 precipitates at the internal oxidation reaction front. Then, MnO-Cr2O3 forms on the MnO- SiO2 particles. The existence of these two phases played an important role to determine the terminal value of the average radius.

    Original languageEnglish
    Pages (from-to)531-540
    Number of pages10
    JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    Issue number7
    Publication statusPublished - 2009

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Physical and Theoretical Chemistry
    • Metals and Alloys
    • Materials Chemistry


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