TRUE or FALSE? (Write T or F in the space provided) 1. Brass is an example of in
ID: 1863257 • Letter: T
Question
TRUE or FALSE? (Write T or F in the space provided)
1. Brass is an example of interstitial solid solution while plain carbon steel is an example of substitutional solid solution. ( )
2. Steel grade AISI 1045 contains 4.5% carbon. ( )
3. Presence of beach marks on a fracture surface indicates a fatigue failure mode. ( )
4. FCC structure is more densely packed than the BCC structure. ( )
5. Critical Resolved Shear Stress (CRSS) is a property of material, which indicates the minimum amount of shear stress needed to initiate slip (permanent deformation). ( )
6. When impact test temperature is below the so-called ductile to brittle transition temperature (DBTT) the fracture mode changes from ductile (fibrous) to brittle (crystalline) fracture. ( )
7. Cup and cone failure could be obtained in tension testing of a cured cement bar. ( )
8. Recrystallization is a process that involves the nucleation and growth of new, strain free grains within the matrix of highly deformed cold worked grains. ( )
9. Quenching causes the soft, FCC austenite phase to transform into hard, BCT martensite phase. ( )
10. Material with ASTM grainsize #8 has finer crystals than that with a grainsize of ASTM #5. ( )
Explanation / Answer
1. T
2. T
3. F
4. T
5. F
6. F
7. T
8. F
9. F
10. T
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