part a) A carbon-Fe alloy containing 1.5 wt% C is cooled down to 800°C. Determine what phases are present, the fraction of each phase present, and the composition of each phase. part b) A carbon-Fe...

Extracted text: part a) A carbon-Fe alloy containing 1.5 wt% C is cooled down to 800°C. Determine what phases are present, the fraction of each phase present, and the composition of each phase. part b) A carbon-Fe alloy containing 1.5 wt% C is cooled down to 400 Celsius. Same as above, determine what phases are present, the fraction of each phase present, and the composition of each phase. use the picture below Irn-Iron Carbide Phase Diagram 1600 8 (Ferrite)N538°C 1100 2000 1495°C Liquid 1000- 1400 1394°C 1200 Y (austenite) 2500 y +liquid 1148°C 2.11% 900 Y+ Fe,C 4.30% 2000 1500 800 1000 Y+ cementite Detail view 727°C a+y 700 912°C 727°C a+y 80에 0.77% 0.022% 1500 Ferrite 600 600 a + cementite -Fe,C 1000 α (errte) 1000 Cementite (FeC) - 500 400 a + Fe,C 1 Carbon (% by weight) 6 6.67 0.5 1.0 Carbon (% by weight) 1.5 2.0 2.5 (a) (b) FIGURE 5.4 (a) The iron-iron carbide phase diagram. (b) Detailed view of the microstructures above and below the eutectoid temperature of 727°C (1341°F). Because of the importance of steel as an engineering material, this diagram is one of the most important phase diagrams. Temperature (°C) Temperature (°C)