At elevated temperature, the carbide phases in certain carbon steels are unstable and may decompose into _______. This decomposition is known as graphitization.

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At elevated temperature, the carbide phases in certain carbon steels are unstable and may decompose into _______. This decomposition is known as graphitization.
A . Silicon
B . Graphite nodules
C . Carbon dust
D . Graphite dust

Answer: B

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