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About Fe-Fe3C phase diagram: (20 points) 1. Name the numbered phase zones in Fe-Fe3C phase diagram. (7 points) 2. Classify carbon steel according to their carbon content, and indicate their equilibrium microstructures at room temperature. (5 points) 3. A 1.2 wt%C hypoeutectoid steel is slowly cooled from austenite zone to room temperature. - Calculate the mass fractions of phases in the resulting microstructure. (4 points) - Calculate the mass fractions of microconstituents in the resulting microstructure. (4 points) Composition (at% C) 10 15 T T 1600 1538 5 7 20 25 1400 1 2500 5 1200 1147°C 2 2.14 4.30 2000 (.) Temperature (1500 ature 1000 912°C 6 800 727°C 0.76 0.022 3 600 7 4 1000 4000 (Fe) 1 2 3 4 Composition (wt% C) 5 6 6.70
Submitted by Shannon R. Feb. 10, 2023 02:07 p.m.
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