2004 Volume 44 Issue 9 Pages 1541-1548
The temperature at which a liquid metal is heated may be a source of variation in the quality of as-cast strips. The present study focuses on stabilization of the casting process and improving the quality of as-cast strip by temperature treatment of liquid metal.
At the condition of constant cooling rate it was found that the degree of melt overheating changes the characteristics of solidification as well as the as-cast properties. The phenomenon is interpreted from point of view of different structure of liquid metal at different temperature. At low degrees of overheating, solidification depends on the inherited inter-atomic structure from the solid state. At high degrees of overheating this inherited structure is destroyed and the melt becomes more homogeneous.
Typical and modified melting cycles were compared, to determine the influence of overheating on the as-cast strip quality. The modified cycle resulted in a more stable process and produced higher quality cast strip with better surface finish, a lower degree of segregation and less internal stress.
