With increase in carbide/graphite ratio in cast iron, its__________________?
Correct answer: D. Both A. and B.
- A. Hardness & brittleness increases
- B. Ductility decreases
- C. Neither A. nor B.
- D. Both A. and B.
Explanation
A higher carbide-to-graphite ratio produces a harder, more brittle cast iron because carbides are hard and brittle while graphite generally improves machinability and lubricity. The associated fall in ductility makes both statements correct.
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