Observation of Inclusion in Aluminum Deoxidized Iron

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    • WASAI Kyoko
    • Department of Materials Science and Engineering, Kyushu Institute of Technology
    • MUKAI Kusuhiro
    • Department of Materials Science and Engineering, Kyushu Institute of Technology
    • MIYANAGA Akifumi
    • Kyushu Institute of Technology Now at Kyushu Refractories Company Limited


Aluminum-deoxidized iron at 1 873 K was solidified at 3 different cooling speed; (1) the ultra-rapid cooling of iron using twin rollers, (2) the quenching of iron into copper mold, and (3) the quenching of the iron-bearing crucible in a water bath; the most rapid cooling rate achieved with (1), which was probably about 10<sup>5</sup>K/s, followed (2) and (3). Dendritic, maple-like, polygonal, network-like, coral-like and spherical inclusions were observed in the samples. The dendritic, maple-like and polygonal inclusions varied in size from several tens to a few μm and were classified as primary inclusions since their sizes were independent of cooling speed. However, the network-like and coral-like inclusions (in the sample cooled ultra-rapidly and quenched into copper mold), and spherical inclusions were classified as secondary inclusions since they decreased in sizewith increased cooling speed. A few large spherical inclusions, which would be primary inclusions, were also present.<BR>The analysis of the electronic diffraction of the inclusions established that the α, γ, δ-alumina were presentas secondary inclusions. An amorphous silica spherical inclusion was also observed.


  • ISIJ International

    ISIJ International 42(5), 459-466, 2002-05-15

    The Iron and Steel Institute of Japan

References:  22

Cited by:  4


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