Presence of high amount of silicon in cast iron________________?
Correct answer: D. Increases the formation of graphite
- A. Suppresses the decomposition of Fe3C
- B. Reduces its fluidity
- C. Increases the contraction of the metal
- D. Increases the formation of graphite
Explanation
Silicon promotes graphitisation in cast iron by encouraging decomposition of cementite, Fe₃C, into iron and graphite. Consequently, the amount of graphite increases rather than the metal contraction or fluidity loss described in the other options.
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