ME216-HW5-151-SOL.docx - Problem 1 A brass specimen having...

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Problem # 1 A brass specimen having an average grain diameter of 0.05 mm is annealed at 600 o C for 100 minutes. After annealing the average grain diameter increased by 100% of the original diameter. Determine the annealing time if it is desired to increase its grain diameter by a further 400%, without changing the annealing temperature. SOLUTION mm d mm d kt d d o n n o 1 . 0 05 . 0 05 . 0 05 . 0 Assume n=2 . min 10 5 . 7 ) 100 ( 05 . 0 1 . 0 2 5 2 2 mm x k k Now mm x d mm d o 4 . 0 4 1 . 0 1 . 0 1 . 0 min 2000 ) ( 10 75 . 4 1 . 0 4 . 0 5 2 2 t t x Problem # 2 The yield strength of a brass alloy that has an average grain diameter of 0.01 mm is 150 MPa. The yield strength reduces by 50% when the grain size increases by 650%. Determine the percent change in the yield strength if the grain size is reduced by 40% from its original diameter of 0.10 mm. SOLUTION  y
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  • Fall '12
  • Dr.Tahir

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