Which instability arises when supercooled liquid tin solidifies rapidly during continuous casting?

💡 Explanation

When a supercooled liquid tin solidifies rapidly, constitutional supercooling occurs due to the segregation of alloying elements at the solid-liquid interface, creating a zone where the liquid ahead of the interface is also supercooled, leading to instability. Therefore, constitutional supercooling and segregation occur, rather than viscous fingering, ratcheting or general dendritic growth which do not directly depend on element partitioning.

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