MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Molten Metal Surface Pattern and Its Generating Mechanism in Gray Cast Iron
Toshitake KannoYuki IwamiTaiji FukuoNatsuki MiyaiHideo NakaeYuichi Hiramoto
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2015 Volume 56 Issue 12 Pages 2017-2022

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Abstract

The surface patterns called Bamboo-leaf type, Pine needle type and Hexagonal type appear at around 1350°C on the molten iron. These patterns are known to be used to examine the condition of the molten cast iron in a cupola. In this study, the developing mechanism of the surface patterns was examined.
The origin of the surface patterns is a surface SiO2 film which formed by the oxidation of Si with CO. The difference in radiation rate between SiO2 and molten iron makes the patterns visible. The addition of 0.02% mass% S reduces the surface tension remarkably. As a result, a complex Marangoni convection occurs beneath the surface and it generates the complex surface patterns. The characteristics of the molten iron get better in the order of Bamboo-leaf, Pine needle and Hexagonal pattern. The Hexagonal pattern becomes finer by the inoculation.

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© 2015 Japan Foundry Engineering Society
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