Chemical Composition of Inclusions Observed in High-purity Iron Ingots Melted in an Alumina Crucible

Dan, Tapan Kumar; Aritomi, Noriyoshi; Ogawa, Kazuyuki; Nakamura, Yoshimichi

doi:10.2320/jinstmet1952.49.10_865

Cited by 2 publications

(1 citation statement)

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“…However, under the same condition of liquid iron, it would depend on the purity of alumina crucible. 21) In the present experiment, even from a high purity, alumina crucible, the silica was dissolved in the liquid iron. Thus, the difference between the total oxygen and the sum of oxygen derived from Insol Al and equilibrium value is not always an indication of alumina dissolution.…”

Section: Minimum Size Of Inclusionmentioning

confidence: 94%

Observation of Inclusion in Aluminum Deoxidized Iron.

2002

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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 5 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 mm 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 size with increased cooling speed. A few large spherical inclusions, which would be primary inclusions, were also present.The analysis of the electronic diffraction of the inclusions established that the a, g, d-alumina were present as secondary inclusions. An amorphous silica spherical inclusion was also observed.

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Section: Minimum Size Of Inclusionmentioning

confidence: 94%