1. A plastically deformed metal crystal at low temperature exhibits wavy slip line pattern due to
2. Which of the following microstructures of the eutectic is not observed in binary alloys?
3. Upon addition of sodium oxide to molten silicate slag, the viscosity of the slag
4. A 0.4 wt% C steel is austenitised at 900°C for 1 hour and heat treated to get different. inicrostructures. Match the following microstructures to the heat treatments.
P. Martensite + Retained austenite
1. Annealing
Q. Ferrite + fine pearlite
2. Quenching
R. Ferrite + spheroidal cementite
3. Quenching + temperature at 600°C
S. Ferrite + coarse pearlite
4. Normalising
| P. Martensite + Retained austenite | 1. Annealing |
| Q. Ferrite + fine pearlite | 2. Quenching |
| R. Ferrite + spheroidal cementite | 3. Quenching + temperature at 600°C |
| S. Ferrite + coarse pearlite | 4. Normalising |
5. Which of the following has the highest hardness number?
6. Assertion: a : During hardening of steel, the component to be heat treated is strongly agitated in the quenching medium.
Reason : r : The agitation breaks down the vapour barrier allowing the quench to proceed at a more rapid rate.
Reason : r : The agitation breaks down the vapour barrier allowing the quench to proceed at a more rapid rate.
7. Stretcher strains found in a low carbon sheet are associated with
8. Identify the type of the following invariant reaction:
liquid 1 + solid 1 ⇋ solid 2
liquid 1 + solid 1 ⇋ solid 2
9. With increase in annealing temperature, the following defect density decreases.
10. The number of Bravais space lattices with two lattice points are
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