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Which of the following materials can have the negative volumetric shrinkage of the casting?

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in Casting-Forming-Welding I by (687k points)
Which of the following materials can have the negative volumetric shrinkage of the casting?

(a) Aluminium

(b) Steel

(c) Zinc

(d) Grey cast iron

I have been asked this question during an online interview.

My question comes from Riser Design in portion Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

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The correct option is (d) Grey cast iron

Easiest explanation: Different materials have different volumetric shrinkage, in which grey cast iron is the material which sometimes may have a negative shrinkage. This mainly occurs because of high carbon and silicon contents in the grey cast iron, which results in occurring of graphitization which increases the volume.

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