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Rapid heat extraction from the casting causes narrowing of liquid-solid zone which sweeps itself across the molten metal.

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in Casting-Forming-Welding I by (687k points)
Rapid heat extraction from the casting causes narrowing of liquid-solid zone which sweeps itself across the molten metal.

(a) True

(b) False

The question was asked in quiz.

I would like to ask this question from Mechanism of Solidification topic in chapter Cooling and Solidification of Casting-Forming-Welding I

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Correct choice is (a) True

The explanation: In solidification of casting material, it is commonly starts from the centre-line of the mould before the solidification is complete even at the mould face. In the chilled mould, due to the rapid heat extraction from the casting, a narrow like liquid-solid zone sweeps across the molten metal.

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