Question

Progressive solidification is better than the directional solidification and it is independent to the geometry of mould.

(a) True

(b) False

The question was posed to me by my college professor while I was bunking the class.

Query is from Directional Solidification in portion Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

Answer 1

The correct option is (b) False

To explain: Solidification is greatly affected by the geometrical shape of the mould cavity; variation in geometry causes the change in heat flow which leads to altering of solidification. In the condition of progressive solidification, there is always a chance of shrinkage defects. So it cannot be better than directional solidification.