Question

The difference in the progress of crystallization at different points in the casting material causes fast and abrupt growth of crystals.

(a) True

(b) False

The question was posed to me by my school principal while I was bunking the class.

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

Answer 1

Right answer is (b) False

The explanation: The difference in the progress of crystallization at the different points in the casting material does not make fast growth of crystals, even this makes the hampering of crystal growth which basically restricts or retards the columnar growth of crystals starting from the moulding surface during casting process.