Question

Which of the following parts can be used to have uniform crystallization at all over the points in the casting material?

(a) Chaplets

(b) Biscuit

(c) Chills

(d) Core

This question was posed to me in an online interview.

The doubt is from Mechanism of Solidification in section Cooling and Solidification of Casting-Forming-Welding I

Answer 1

Correct option is (c) Chills

Explanation: To avoid the problem of difference in progress of crystallization, a large thermal gradient within the mould can be produced by having chills in the casting system. Chills generally are cooled metal block with the high thermal conductivity; this is normally placed at the mould’s end.