Question: Working in a steel mill, you are preparing a sample of polycrystalline austenite with 1.5 wt% C. The sample has been heated to 1200C and

Working in a steel mill, you are preparing a sample of

Working in a steel mill, you are preparing a sample of polycrystalline austenite with 1.5 wt% C. The sample has been heated to 1200C and is slowly cooled. The phase diagram of iron-carbon is shown below. Composition (at%C) 10 15 5 20 25 1600 1538C 1493C L 1400 2500 1394C Y+L 1200 1147C 2.14 4.30 7. Austenite 2000 Temperature (C) 1000 Temperature (F) 912C ++ Fe30 800 . + 1500 727C 0.76 0.022 600 a, Ferrite a + Fezc Cementite (Fe3c) 1000 400 0 (Fe) 6.70 Composition (wt% C) a) Draw the microstructure of your sample if it is slowly cooled to just below the eutectoid line. Determine the phases present, their compositions, and their weight fractions. b) What is the weight fraction of Fe,C in the eutectoid microstructure

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