Question:
In white cast iron, carbon is present as
In white cast iron, carbon is present as
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White Iron = Cementite (Hard); Grey Iron = Flake Graphite (Brittle); Malleable = Temper Carbon.
Updated On: Jul 4, 2026
- Flake graphite
- Spheroidal graphite
- Temper carbon nodules
- Cementite
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The Correct Option is D
Solution and Explanation
Step 1: Concept The form of carbon in cast iron determines its classification and mechanical properties.
Step 2: Meaning White cast iron is named for its white, crystalline fractured surface, which lacks visible graphite.
Step 3: Analysis During rapid cooling, carbon does not have time to precipitate as graphite. Instead, it reacts with iron to form iron carbide.
Step 4: Conclusion In white cast iron, carbon is present in the form of cementite ($Fe_{3}C$), making it very hard and brittle. Final Answer: (D)
Step 2: Meaning White cast iron is named for its white, crystalline fractured surface, which lacks visible graphite.
Step 3: Analysis During rapid cooling, carbon does not have time to precipitate as graphite. Instead, it reacts with iron to form iron carbide.
Step 4: Conclusion In white cast iron, carbon is present in the form of cementite ($Fe_{3}C$), making it very hard and brittle. Final Answer: (D)
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