Exam 1 2012

Compute the composition of the proeutectoid ferrite 8

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Unformatted text preview: temperature just slightly below 723°C contains 75% proeutectoid ferrite. Compute the composition of the proeutectoid ferrite. (8 points) A hypoeutectoid steel at a temperature just slightly below 723°C contains 25% eutectoid ferrite. Compute the amount of eutectoid cementite. (10 points) A hypereutectoid steel just below 723C contains 86.7% eutectoid ferrite. Compute the amount of a) cementite and b) pearlite (15 points) A 0.35 percent C plain-carbon steel is slowly cooled from about 950ºC to a temperature just slightly below 723ºC. Calculate the weight percent pearlite present in the steel. (12 points) Answers: I) 0.02% Carbon (if you had answered before the correction given during the exam, I also considered other solutions as well) II) 3.3% III) a) total cementite = 13.3% , b) pearlite: 98.2% IV) 42.3%...
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This note was uploaded on 01/23/2014 for the course CEE 60 taught by Professor P.j.m.monteiro during the Spring '12 term at Berkeley.

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