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Ripple Marks on Surface of Aluminum Alloy Strips Cast Using High Speed Twin Roll Caster Equipped with Nozzle

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Abstract:

Ripple marks are typical surface defects in aluminum alloy strip cast using a twin-roll caster. Ripple marks occur whether or not a nozzle is used, but become remarkably pronounced when a nozzle is used and the melt head increases. The ripple marks on strip cast using a vertical-type high-speed twin-roll caster were different from those formed when using a conventional horizontal-type twin-roll caster. The formation of ripple marks was influenced by Si content, indicating that ripple marks are affected by latent heat and viscosity in the semi-solid state. The occurrence of ripple marks was predicted and they were classified into three types based on Si content. Additionally, the shape of the nozzle tip, which might improve the occurrence of these defects, was discussed.

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Periodical:

Key Engineering Materials (Volume 1058)

Pages:

173-178

DOI:

https://doi.org/10.4028/p-z3fYkY

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Online since:

June 2026

Authors:

Toshio Haga*, Hiizu Ochi, Hiroshi Fuse, Hisaki Watari, Shinichi Nishida

Keywords:

Aluminum Alloy, High Speed Twin Roll Caster, Latent Heat, Nozzle, Ripple Mark, Viscosity

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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