The GATE Grind

GATE 2021 ME (ME2) – Question 14

Engineering Materials · Phase diagrams and heat treatment · 1 mark · Multiple choice

The Cast Iron which possesses all the carbon in the combined form as cementite is known as

  1. Grey
  2. Spheroidal
  3. Malleable
  4. White

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Show answer and explanation

Correct answer: (D) White

Explanation

White cast iron retains carbon in iron carbide, Fe₃C, rather than free graphite. This produces its hard brittle structure and pale fracture appearance.

Grey and spheroidal irons contain graphite; malleable iron contains temper carbon after heat treatment. **Answer: White cast iron (D)**.