Question: Common Data for Questions (a) and (b) : A plain 0.45 wt% carbon steel is cooled slowly from 900C to just below the eutectoid temperature

Common Data for Questions (a) and (b): A plain 0.45 wt% carbon steel is cooled slowly from 900°C to just below the eutectoid temperature (723°C) so that the following reaction occurs:

? (0.8 wt% C) ? ? (0.02 wt% C) + Fe₃C (6.67 wt% C)

Q.(a): During cooling from 900°C to 723°C, the proeutectoid ? forms from ?. Find the volume % of proeutectoid ? just below 723°C for the steel.

44.9% (B) 66.1% (C) 55.1% (D) 34.9%

Q. (b): Find the volume % of pearlite for the steel just below 723°C for 0.45 wt% carbon steel.

44.9% (B) 55.1% (C) 40.9% (D) 59.1%

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