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Unformatted text preview: 3 80 10 7 11 2 8.314 873 6.2 10 1.013 10 / d Q RT D D e e m s ---- = = = Diffusion flux: 11 10 2 3 2 1.2 0.8 1.013 10 8.1 10 / 5 10 10 C J D kg m s x-----= - = - = - -Time Steel Copper Yield Strength 3. Two dog-bone samples of i) Copper and ii) Steel are heavily coldworked at room temperature and then annealed at 300C. As a function of annealing time, how would the yield stress vary for each sample? Indicate on the plot below. (4 points for each sample) Steel: The recrystallization temperature is 450C, while the sample is annealed at 300C. Recrystallization does not occur. The yield strength remains at the cold work value. Steel: The recrystallization temperature is 120C. The sample is annealed at 300C. Recrystallization occurs. The yield strength decreases as the the annealing time increases....
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This note was uploaded on 04/03/2012 for the course MSE 230 taught by Professor Trice during the Spring '08 term at Purdue University-West Lafayette.
- Spring '08