Question

(6) Below is a portion of the Iron-Carbon Phase Diagram relevant to steel. Using the following phase diagram, make schematic sketches of the microstructures that would be observed for the alloy (1) 0.76 wt% C-99.24 wt% Fe and for the alloy (2) 5.0 wt% C-95.0 wt% Fe at 1000 and 600°C. Label all phases in your sketches and determine the composition and amount of each phase present (20 points) 1600538°C 1493°C 1400 1394°C 1200 1147°C 7. Austite Temperature (°C) 912°C Y+ Fe30 800 727°C 0.76 600 0022 a. Perrite U 0.015 Cementite (Feci 100 Composition (wt% C)

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Answer 1

at 1000 C at 60oC Ferrite Austenite Compositions at 11006c Gooc Nil 0.76 wt%C 8-phase a-phase 0.015 wt%C Nil 6.7 wt%C Nil fęc phase phase amount Gooc 1000 C I Nil 100 % 8-phase d-phase Nil 88.86 wt% 41.14 wt% Nil Fec phase I fez c - 0.76 0.015 6.7 -0.76 xrob -88.86 WX) kb 3 7.7-0.015 Hress slab- h = 11:14 wty,

600 C at 100o C proeutectic eutectic Tezc 8-phase Proeutectic Fel Fez C Compositions a at Gooc ♡ phase I 10 7 wt%C | Nil d-phase Fệc phase. oools the 6.7 wt'fc 6.7 wtfc at 608c phage amounts at 1000 C & phase I 34 wt), 2-Phase 66 wtf Nil 25.4 wt% 74.56 wty, I feze-phase 6.5 5 0.015 7 5 - - 6.7 6.7-5 6.7-0 AS as X160=25.4 6-7-5. Nov = 134% 2 6.7-1.7 Hec = 100-klx = 74.56 1. harca 100-W = 0.66