3.0 wt% C-97.0 wt% Fe (Alloy 2): problem 5 (30 points) For two iron-carbon alloys of composition 1.5 wt%C-98.5 wt% Fe (A

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3 0 Wt C 97 0 Wt Fe Alloy 2 Problem 5 30 Points For Two Iron Carbon Alloys Of Composition 1 5 Wt C 98 5 Wt Fe A 1 (1.54 MiB) Viewed 45 times

3.0 wt% C-97.0 wt% Fe (Alloy 2): problem 5 (30 points) For two iron-carbon alloys of composition 1.5 wt%C-98.5 wt% Fe (Alloy 1) and a) make schematic sketches of the microstructure that would be observed for both alloys under conditions of very slow cooling at the following four temperatures: 1250°C, 1145°C, 730°C and 700°C. (b) Label the phases with their names and indicate their compositions (approximate) of those microstructures in both alloys at those four different temperatures in (a). (c) Determine the mass fractions of the proeutectoid and eutectoid cementite phases at 700°C for both alloys. (d) What are these two alloys are called in common engineering applications? 1600 1538°C 1493°C Alloy 2 1400 Aloy 1 L 1394°C y+L -1250°C 1200 2.14 1145°C 4.30 7. Austenite Temperature (°C) 1000 912°C y + Fe3c 800 ta + 7 730°C 727°C 0.76 700°C 0.022 600 a, Ferrite af Fe₃c Cementite (Fe3C) 400 0 (Fe) 1 2 5 6 6.70 3 4 Composition (wt% C)