A steel containing 0.95% C is heated to various temperatures above the eutectoid temperature, held for 1

Question:

A steel containing 0.95% C is heated to various temperatures above the eutectoid temperature, held for 1 h, and then quenched to room temperature. Using Figure 12-32, determine the amount and composition of any martensite that forms when the heating temperature is
(a) 728 ˚C
(b) 750 ˚C
(c) 780 ˚C
(d) 850 ˚C