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Presence of which material in a gray cast iron causes reduced ductility?

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in Casting-Forming-Welding II by (119k points)
Presence of which material in a gray cast iron causes reduced ductility?

(a) Graphite

(b) Aluminium

(c) Coke

(d) Zinc

The question was asked by my school principal while I was bunking the class.

This question is from Cast Irons topic in division Foundry Introduction & Materials of Casting-Forming-Welding II

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Best answer
The correct answer is (a) Graphite

Explanation: Among all the types of cast irons that are manufactured, gray cast irons are most widely used. The colour of this alloy is dull gray. Gray cast iron contains graphite flakes, which are responsible for the reduced ductility and strength.

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