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3313Q5Sp02 - -1 ENSC 3313 Spring 2002 Answer anv 4...

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,-1) Quiz 5 Name ENSC 3313, Spring 2002 Answer anv 4 Questions only, 1 point each Provided is a 1 mm diameter iron wire of ultimate strength 350 MPa. Required is a 0.5 mm diameter wire of strength <350 MPa, hardness <125 BHN and ductility (50 mm) <40%. Describe an appropriate processIng sequence. Hardness and Strength mandate <-22% CW Ductility mandates >-18% CW Choose ~ CW! . ~ ~ 2: :t = -:; " -2 ~ :t ~ d2 -d2 0.2= o f= Needd =056mm d2 d2 o . o o Sample is worked as received, so anneal and reduce d to ~ mm by CW -anneal cycles, or Hot Wk to 0.56 mm, thence CW .fQ%. What does this overhead projector diagram illustrate? What have I blacked out? 2. ~ It is illustrating how refining the grain size raises the yield strength of a metal. I marked out "not for high temperature (creep)." Grain boundary sliding occurs, leading to grain boundary voids that link up causing failure. ~ The 50% recrystallizatioll time (tSO) of pure Cu, cold rolled 98%, is 9 mill. at 135°C and 250 mill. at 88°C. What is tSO, ill mill., at room temperature, 25°C?
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