Temperature (°C). Consider 2.4 kg of austenite containing 0.55 wt% C, cooled to below 727°C (1341°F). (a) What is the proeutectoid phase? (b) How many kilograms each of total ferrite and cementite form? (c) How many kilograms each of pearlite and the proeutectoid phase form? 1600 Composition = Composition = Temperature = Composition (at% C) Temperature = 5 10 15 20 25 1538493-C 1400 I 2500 1394 °C 7-1 1200 1147 °C 7. Austenite 2.14 4.30 2000 1000 912 °C 800 a+y 0.76 600 0.022 Ferinte 1085 °C 400 1 2 (Fe) a+FeC 3 4 Composition (wt% C) 7+ Fe3C 1500 727 °C Cementite (Fe,C) 1000 15 6 6.70 Temperature (°F)