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Consider 1.1 kg of austenite containing 1.2 wt% C, cooled to below 727°C (1341°F). (a) How many kilograms of total ferrite form? (b) How many kilograms of total cementite form? (c) How many kilograms of pearlite form? (d) How many kilograms of the proeutectoid phase form? The iron-iron carbide phase diagram is shown in the Animated Figure 10.28

Composition = 0 wt% Composition = 0 at% emperature = 0 °C Temperature = 32 F Composition (at% C) 10 15 20 25 160 538C 1493 °C 2500 1394 °C 1200 1147 C CO 2.14 4.30 Austenite 2000 1000 912 °C アーFeyC 800 1500 727 °C 0.76 0.022 α, Ferte 600 085 °C Cementite FeC) 1000 2 3 4 6 6.70 Composition (wt% C)

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