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Melt instabilities and the effect of surface tension on preventing edge serrations in melt overflow alloy strip casting
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Date
1998-01-01
Author
Kalkanlı, Ali
Braithwaite, Nick
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Direct casting of metallic strip onto a single rotating chiller is possible by the displacement of liquid metal in a horizontal pouring channel against a vertically moving chiller surface. In the case where of a high liquid/vapour surface tension exists, the liquid cannot be dragged out of the melt pool by momentum transfer. The critical surface tension values for making strip in a series of 304 stainless steels as measured by a modified oscillating droplet technique, values 2.1-1.4 N m(-1). Surface tension values greater than these lead strip breakup. Casting of alloys with a low surface tension such as 1.3-1.1 N m(-1) at a wheel speed of 2.7ms(-1) can result instability waves such as Marangoni, Kelvin-Helmholtz and capillary waves. These waves result in the formation of edge serrations in the solidified strip. If the casting speed is sufficiently high to overcome these melt instabilities, strips can be produced with a smooth edge and uniform dimensions. In this paper the results of melt overflow direct strip casting experiments with different alloy and process conditions for strip dimensions up to 700 mu m and 40 mm wide are presented.
Subject Keywords
Mechanical Engineering
,
Materials Chemistry
,
Mechanics of Materials
,
Metals and Alloys
URI
https://hdl.handle.net/11511/46786
Journal
ISIJ INTERNATIONAL
DOI
https://doi.org/10.2355/isijinternational.38.142
Collections
Department of Metallurgical and Materials Engineering, Article
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A. Kalkanlı and N. Braithwaite, “Melt instabilities and the effect of surface tension on preventing edge serrations in melt overflow alloy strip casting,”
ISIJ INTERNATIONAL
, pp. 142–148, 1998, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46786.