1.

The presence of solid crystals at solid-liquid interface makes feeding of molten metal more easily.(a) True(b) FalseThis question was addressed to me in a national level competition.Query is from Mechanism of Solidification in section Cooling and Solidification of Casting-Forming-Welding I

Answer»

Right choice is (b) False

The explanation: The presence of solid crystals ahead of the solid-LIQUID interface does not make easy FEEDING, even this makes more DIFFICULT to FEED the liquid metal. This basically implies a greater risk of having voids within the casting which is normally referred to as centre-line SHRINKAGE defect.



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