2. Using an iron-carbon alloy phase diagram, determine the following for a 99.6 wt% Fe-0.40 wt% C at a temperature just below the eutectoid, a) the amount of carbide (cementite) in grams that forms per kg of steel b) the amount of pearlite and proeutectoid ferrite (a) per kg of steel
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References Composition = 0 wt% C Composition = 0 at% C Temperature = 400 °C Temperature = 752 °F Composition (at% C) 5 10 15 20 25 1600 1538 °C 1493 °C δ L 1400 2500 1394 °C γ + L 1200 1147 °C 2.14 4.30 γ, Austenite 2000 1000 912 °C γ + Fe3C 800 1500 727 °C α + γ 0.76 0.022 600 α, Ferrite α + Fe3C 1085 °C Cementite (Fe3C) 1000 400 0 1 2 3 4 5 6 6.70 (Fe) Composition (wt% C)
Adi S.
Figure 1 shows the iron-carbon alloy phase diagram. An iron-carbon alloy of composition 1.5 wt% C - 98.5 wt% Fe is slowly cooled from 1200°C to 500°C. For the following temperatures 1200°C, 800°C, and 700°C: i. Indicate the different phases present [5 marks] ii. Determine the composition of each phase [6 marks] iii. Calculate the mass fractions of each phase [8 marks] iv. Make schematic sketches of the microstructures that would be observed and label the phases [6 marks]
Madhur L.
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