The Nature Of Materials And Solid State Changes In Metals Flashcards
1
Q
- Under ordinary usage, metals exist as:
A. Amorphous solids
B. Mixtures and compounds of iron and carbon
C. Crystalline solids
D. Face-centered cubic lattices
A
C. Crystalline solids
2
Q
- The terms body-centered cubic, face-centered cubic and hexagonal close-packed all refers to the:
A. Different size grains that can exist at the same time in a metallic structure
B. Sequence of crystalline growth in a typical mild steel
C. Lattice structures that make up unit cells in a solid metallic structure
D. Change in a metallic structure as it undergoes plastic deformation
A
C. Lattice structures that make up unit cells in a solid metallic structure
3
Q
- True/False: In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. It is that temperature and pressure at which the sublimation curve, fusion curve and the vaporisation curve meet.
A
True
4
Q
4. The process of returning ductility to a cold-worked low-carbon steel is called: A. Precipitation B. Recrystallization C. Allotropic change D. Austenitization
A
B. Recrystallization
5
Q
5. Many metals exhibit an increase in strength caused by plastic flow beyond the elastic limit. This effect is called: A. Twinning B. Plastic deformation C. Work hardening D. Age hardening
A
C. Work hardening
6
Q
6. When used as in-process treatment, recrystallization can: A. Improve ductility B. Enlarge grains C. Increase hardness D. Passionate the surface
A
A. Improve ductility
7
Q
- Processes called austenitizing, annealing, normalizing and spheroidizing are:
A. Performed only on nonferrous metals
B. Approximate equilibrium heat-treatment processes
C. Cold-working processes
D. Age-hardening processes
A
B. Approximate equilibrium heat-treatment processes
8
Q
8. The term “precipitation hardening” is often used interchangeably with the term: A. Age hardening B. Recrystallization C. Annealing D. Work hardening
A
A. Age hardening
9
Q
9. An NDT method that has the ability to measure changes in electrical conductivity caused by the effects of heat treatment is: A. Magnetic particle testing B. Acoustic emission testing C. Eddy current testing D. Immersion ultrasonic testing
A
C. Eddy current testing
10
Q
10. Spheroidizing and normalizing have the effect of: A. Increasing ductility B. Age hardening C. Reducing the grain size D. Causing a phase change
A
A. Increasing ductility
11
Q
11. When a steel has been quench-hardened and then reheated to some point below the lower transformation temperature for the purpose of reducing brittleness, this is called: A. Austenitization B. Thermal slip deformation C. Allotropic change D. Tempering
A
D. Tempering
12
Q
12. Annealing is usually performed to: A. Increase hardness B. Reduce corrosion C. Relieve stress D. Increase conductivity
A
C. Relieve stress
13
Q
13. Attacks on metals by direct chemical action and/or electrolysis are called: A. Rust B. Corrosion C. Austenitic transformations D. Galvanization
A
B. Corrosion
14
Q
14. Metal corrosion that is accelerated when the metal is under load is called: A. Pitting corrosion B. Galvanic corrosion C. Electrochemical corrosion D. Stress corrosion
A
D. Stress corrosion
15
Q
15. Which of the following does not help prevent corrosion? A. Stress relieving B. Anodizing C. Insulating D. Electroplating
A
C. Insulating
