Question

Good thermal conductivity of the solidified metal can lower down the surface temperature below than the freezing temperature.

(a) True

(b) False

The question was posed to me in homework.

This key question is from Solidification with Predominant Interface Resistance in chapter Cooling and Solidification of Casting-Forming-Welding I

Answer 1

Correct choice is (a) True

Explanation: Good thermal conductivity of the solidified metal can provide considerable thermal resistance. Because of this, the surface temperature of the casting material can be lower down below than the freezing temperature of the casting, which results in the formation of sub-cooled solidified casting.