800 А Eutectoid temperature 1 700 A 1 600 P 1 500 B Temperature (°C) 00 8 400 ***8 А 300 M(start) 200 M+A 50% M(50%) M(90%) ( 100 2 0 10 1 10 102 103 104 105 Time (s)
2. Identify the microstructure formed in the steel alloy based on the TTT-Diagram above after each heat treatment step (a) The steel is rapidly cooled or quenched from 800 °C to 580 °C, and then held for 60 sec, and slowly cooled to room temperature (b) Cooled to 500 °C, held for 3 sec, and rapidly cooled to room temperature (c) Cooled to 400 °C, held for 50 sec, and then rapidly cooled to room temperature.
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