MSE121_Sp08_PracticeMidtermSolns

MSE121_Sp08_PracticeMidtermSolns - Midterm Exam MSE 121,...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Midterm Exam MSE 121, Spring 2007 Problem 1 Problem 1 (50 points) Consider the shape casting of a Cu-36 wt.% Pb alloy poured from an initial liquid temperature of 1000C into a tungsten permanent die mold. Perform a detailed assessment of the solidification front at 500C to assess the likelihood of constitutional supercooling. Plot both the composition variation and the temperature variation across the solid- liquid interface to support your analysis. What do you conclude? 10 1000 800 600 400 200 20 30 40 50 60 70 80 90 wt. % Pb C Cu Pb L 1084.5 955 991, 63% 326 99.94% 87% 36% 327.5 Cu + L I Cu + L II Cu + Pb L I + L II Cu Pb Figure 1 The copper- lead equilibrium phase diagram, from the Metals Handbook , 8 th Edition , Volume 8 , American Society for Metals, Metals Park, Ohio, p. 296 (1973). 10 1000 800 600 400 200 20 30 40 50 60 70 80 90 wt. % Pb C Cu Pb L 1084.5 955 991, 63% 326 99.94% 87% 36% 327.5 Cu + L I Cu + L II Cu + Pb L I + L II Cu Pb wt.% Pb 20 40 60 80 100-8-6-4-2 2 4 Solid Liquid x Choose 3 locations, note compositions Relative amounts of solid and liquid by lever rule Plot 3 concentrations, fnd corresponding liquidus temperatures 10 1000 800 600 400 200 20 30 40 50 60 70 80 90 wt. % Pb C Cu Pb L 1084.5 955 991, 63% 326 99.94% 87% 36% 327.5 Cu + L I Cu + L II Cu + Pb L I + L II Cu Pb 125 250 375...
View Full Document

Page1 / 21

MSE121_Sp08_PracticeMidtermSolns - Midterm Exam MSE 121,...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online