Question

Surface irregularities of the solidifying casting can increase the temperature at the interface.

(a) True

(b) False

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Query is from Solidification with Predominant Interface Resistance in section Cooling and Solidification of Casting-Forming-Welding I

Answer 1

Right choice is (b) False

To elaborate: The surface irregularities of the solidifying casting results in irregular contacts to establish between the die wall and the casting produced. This always results in a temperature drop across the interface. The extent of temperature drop or the degree of resistance mainly depends on the contact area, physical and thermal properties of the materials in contact.