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AUB-quiz II-Optional-solution - AUB-Spring 2013...

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AUB-Spring 2013 MECH340: (Quiz II-1H15) Problem 1. 30 pts One kilogram of an alloy of 60 weight % Pb and 40 weight % Sn is slowly cooled from 300 o C. Refer to the lead-tin phase diagram of the Figure 1 and calculate the following: a) The weight percent of the liquid and proeutectic alpha just above the eutectic temperature (183 o C) and the weight in kilograms of these phases. b) The weight in kilograms of alpha and beta formed by the eutectic reaction. Problem 2-30 pts The Fe-Fe 3 C binary phase diagram is given in your textbook. a) What is the melting temperature of pure Fe? (ii) What is the maximum solid solubility of C in austenite? (iii) At what temperature(s) does pure FCC-Fe transform into pure BCC Fe? (iv) What is the melting temperature of Fe 3 C? b) Consider an Fe-1.0 wt% C alloy equilibrated at 728 o C i) indicate the phase or phases present; ii) indicate the composition of each phase; iii) determine how much of each phase is present; iv) provide a well-labeled sketch of a possible microstructure.
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