Which of the following materials can have the negative volumetric shrinkage of the casting?(a) Aluminium(b) Steel(c) Zinc(d) Grey cast ironI 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

Which of the following materials can have the negative volumetric shri

1.	Which of the following materials can have the negative volumetric shrinkage of the casting?(a) Aluminium(b) Steel(c) Zinc(d) Grey cast ironI 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
Answer» 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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