MatE272_Practice Exam #2

MatE272_Practice Exam #2 - MatE 272 Fall 2003 Exam 2 Last...

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MatE 272 Fall 2003 Exam 2 Last Name_____________________ First Name_____________________ Use PENCIL and fill in correct answer Questions 1-15 worth 5 pts each Questions 16-20 worth 10 pts each Answer H is “I don’t know” worth 1 pt each 1. A C D E F G 2. A B C E F G 3. A B C E F G 4. A B C D F G 5. B C D E F G 6. B C D E F G 7. A B C D E G 8. A C D E F G 9. A C D E F G 10. A B C E F G 11. A B C D F G 12. A B C D E G 13. A B D E F G 14. A C D E F G 15. A B C E F G 16. A C D E F G 17. A B C D F G 18. A B D E F G B C D E F G 20. A C D E F G Handy Constant’s Mol. Wt’s k = 8.62 x10 -5 eV/atom-K C = 12 g/mol R = 8.13 J/mol-K H = 1 g/mol N A = 6.023x10 23 atoms/mole Cl = 35 g/mol F = 19 g/mol γ + Fe 3 C α + Fe 3 C γ - Austenite Fe 3 C - Cementite α - Ferrite γ + L α + γ L 2.11 0.022 0.77 4.30 Table  1 Met al        St ruct ure  Ato mic Radius    (Å) Lead FCC 1.75 0  Gold 1.44 2  Sodium BCC 1.86 0 Alumin um 1.43 1  Tungst en 1.37 1  Chromiu m 1.25 0 Copper 1.27 8 Cobalt HCP 1.25 3 Barium 2.17 0 Iron  ( α ) 1.24 1 Vanadium 1.32 0 50% 50% For 0.45 wt% C Note: I have added all sorts of dotted lines to make approximations unnecessary. USE THEM! You may assume the term “cool quickly” means “instantaneously”. A+ F A A+ P A + B M (start) M (90%) M (50%) Note: F = Proeutectoid ferrite S = Spheroidite A = Austenite A = unstable Austenite P = Pearlite B = Bainite M= Martensite P B S A A Mg Pb H H H H H H H H H H H H H H H H H H H H
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Multiple Choice 1 – 15 (5 points each) 1. Strengthening & toughening of brittle materials can generally be achieved by; A) martensitic transformations C) introducing dislocations E) adding a solute B) preventing crack propagation D) increasing grain size F) all of the above 2. On a cold day in 1986, the space shuttle Challenger exploded shortly after take-off due to an o-ring failure on a booster rocket. The o-ring polymer was operating below its T g . Which statement(s) are true about an amorphous polymer below its glass transition temperature.
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MatE272_Practice Exam #2 - MatE 272 Fall 2003 Exam 2 Last...

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