6. (25 pts) For a carbon steel alloy of composition 1.0 wt% C is slowly cooled from a temperature of 1600°C to 400°C. Be

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6 25 Pts For A Carbon Steel Alloy Of Composition 1 0 Wt C Is Slowly Cooled From A Temperature Of 1600 C To 400 C Be 1 (42.88 KiB) Viewed 23 times

6. (25 pts) For a carbon steel alloy of composition 1.0 wt% C is slowly cooled from a temperature of 1600°C to 400°C. Below is the iron-FeC phase diagram with eutectoid temperature of 727°C, and eutectoid composition of 0.76 wt%C. (a) Make schematic sketches of the microstructure at each temperature of 1600°C, 1400 "C, 1000 °C, 760 °C, and 720 °C. Please label all phases and indicate their approximate compositions at each temperature. (b) Determine the mass fractions of proeutectoid Fe:C, pearlite, eutectoid a and eutectoid FesCat 720 °C. Composition Cat%C) 10 15 1600 25 1538°C -1493"c 20 L 1400 2500 1394°C 2 1200 1147°C 2.14 4.30 %, Austenite 1 2000 Temperature (°C) 1000 912°C Temperature (9 y Feyc 800 + 1500 727°C 0.76 600 0.022 , Ferrite a + Fezc Cementite (FeyC) - 1000 400 2 4 5 6 6.70 Fel 3 Composition (wt% C)