ASll enginee MSE 494/598 Mid-Term Exam Yield strength is proportional to grain s

Question

ASll enginee MSE 494/598 Mid-Term Exam Yield strength is proportional to grain size (1 point)? True False?) Which grain orientation typically has the lowest tensile elongation (1 point)? 4.3 4.4 Which 4.5 High-strength grain orientation typically has the highest tensile strength (1 point)? aluminum alloys are most susceptible to stress corrosion cracking when loaded in which grain direction (1 point)? What cold work, surface enhancement process is frequently applied to parts to prevent stress corrosion cracking in service (1 point)? 4.6 4.7 Is metal bent perpendicular to the grain direction generally less likely to crack (1 point)? 4.8 The hole depicted in the Figure below was drilled through longitudinal grains. What type of True False pitting corrosion is depicted (1 point)? HOLE Longitudinal Grain Direction 4.9 What is the best test to determine the ductile to brittle transition of a metal (1 point)? 4.10 Provide the best name for the type of fractures below (3 points): A: B: C: Page 4 of 17

Explanation / Answer

2. False (Grain size decreases, yield strength increases)
3. Lowest tensile elongation implies brittle material and brittle materials have very less yield strength, so grain size would be large. (transverse orientation)
4. Low grain size material will have high tensile strength (Longitudnal orientation)
7. False
8. Localized pitting corrosion.
9. Notch bar imapct test.

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