Homework3 - of 6 in to 2 in Assume that the redundant work...

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Homework Assignment 3 ISE 2204 Manufacturing Processes Due Date: March 19, 2009 Please include the Virginia Tech Honor Code pledge in the first page of your assignment and sign it. “I have neither given nor received unauthorized assistance on this assignment.” 1.- We know that pouring molten metal at a high rate into a mold has certain disadvantages. Are there any disadvantages to pouring it very slowly? Explain. 2.- Using the Ni-Cu Phase Diagram, estimate the following quantities for a 20% Cu-80% Ni alloy: (1) liquidus temperature, (2) solidus temperature, (3) percentage of nickel in the liquid at 1400 C (2550 F), (4) the major phase at 1400 C, and (5) the ratio of solid to liquid at 1400 C. 3.- Calculate the force required in direct extrusion of 1100-O aluminum from a diameter
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Unformatted text preview: of 6 in. to 2 in. Assume that the redundant work is 30% of the ideal work of deformation, and the friction work is 25% of the total work of deformation. 4.- A linearly strain-hardening material with a true-stress-true-strain curve = 5,000 + 25,000 psi is being drawn into a wire. If the original diameter of the wire is 0.25 in., what is the minimum possible diameter at the exit of the die? Assume that there is no redundant work and that the frictional work is 15% of the ideal work of deformation. (Hint: The yield stress of the exiting wire is the point on the true-stress-true-strain curve that corresponds to the total strain that the material has undergone.)...
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