A plastically deformed metal crystal at low temperature exhibits wavy slip line pattern due to
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Metallurgical Engineering · all questionsPhysical Metallurgy
Physical Metallurgy
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Which of the following microstructures of the eutectic is not observed in binary alloys?
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Upon addition of sodium oxide to molten silicate slag, the viscosity of the slag
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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 |
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Which of the following has the highest hardness number?
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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.
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Stretcher strains found in a low carbon sheet are associated with
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Identify the type of the following invariant reaction:
liquid 1 + solid 1 ⇋ solid 2
liquid 1 + solid 1 ⇋ solid 2
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With increase in annealing temperature, the following defect density decreases.
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The number of Bravais space lattices with two lattice points are
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Malleabilisation heat treatment is performed on
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What are the crystal structure of Cu, AI, Si, Zn and Ge?
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Match the basic strengthening mechanisms in the following materials.
| Group-I | Group-II |
| P. 60 : 40 brass is stronger than 70 : 30 brass. | 1. Case hardening |
| Q. An automobile gear made from 0.6% C steel and quenched in water from a temperature of 850°C. | 2. Strain hardening |
| R. Tungsten filament drawn at a temperature of 400°C. | 3. Martensitic strengthening |
| S. A ball bearing heated in furnace in ammonia atmosphere. | 4. Second phase strengthening |
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In a dilute solid solution of nickel and carbon in y-iron.
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Match the heat treatment for an eutectoid steel shown in the TTT diagram below (as P, Q, R and S) with the resulting microstructure listed below:
1. Fine pearlite
2. martensite
3. Bainite
4. Coarse pearlite
1. Fine pearlite
2. martensite
3. Bainite
4. Coarse pearlite
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Match the phenomena listed in Group I with the possible mechanisms in Group II.
| Group I | Group II |
| P. Fatigue | 1. Grain boundary sliding |
| Q. Creep | 2. Slip band extrusion and intrusion |
| R. Strain hardening | 3. Cottrell atmosphere |
| S. Yield point phenomenon | 4. Dislocation interaction |
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An Al 4.5 mass% Cu alloy solutionising at 500°C, quenched to room temperature and aged at 200°C for 2 hrs is found to exhibit an increase in hardness. Theprimary mechanism contributing to increased hardness is
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The low angle grain boundary occurs when the orientation difference between the adjacent grains is of the order of
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An Fe - 3 wt % C - 1 wt % Si alloy is cooled very slowly from the liquid state to a temperature of 1023 K. Thereafter, it is cooled in air. The microstructure at room temperature will consist of
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An annealed plain carbon steel, showing fully pearlitic microstructure, has a carbon content of . . . . . . . . wt%.
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