(a) Compute the mass fractions of proeutectoid ferrite and pearlite that form in an ironcarbon alloy containing
0.25wt%C
. (b) What is the distinction between hypoeutectoid and hypereutectoid steels? (c) In a hypoeutectoid steel, both eutectoid and proeutectoid ferrite exist. Explain the difference between them. What will be the carbon concentration in each?