Question
A steel sample with 1.5 wt.% carbon (no other alloying elements present) is slowly cooled from 1100 °C to just below the eutectoid temperature (723 °C). A part of the iron-cementite phase diagram is shown in the figure. The ratio of the pro-eutectoid cementite content to the total cementite content in the microstructure that develops just below the eutectoid temperature is ________. (Rounded off to two decimal places)
Answer :
0.54
Mass fraction of preoeutectiod cementite,
m1= (1.5-0.8)/(6.7-0.8) =0.1186
Mass fraction of total cementite, m2= (1.5-0.035)/(6.7-0.035) =0.2198
m1/m2 = 0.1186/0.2198 =0.54
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