During
quenching, martensite is produced:
With medium cooling rate
With
low cooling rate
With an appropriate cooling rate such that the carbon has time to
migrate
Rapid cooling rate
Rapid cooling rate
●When
austenite form of iron is cooled in such a high rate such that carbon atoms do
not have time to diffuse out of the crystal structure to form cementite, then
martensite is formed.
●Thus,
quenching with rapid cooling rate produces martensite.
Hence,
the correct option is (D).
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