In fracture toughness characterised by KIC or JIC, I in the subscript indicates loading by
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Metallurgical Engineering · all questionsMechanical Metallurgy
Mechanical Metallurgy
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Springback in sheet metal bending depends upon
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Match the following failure/fracture observations in Group 1 with the likely deformation/process in Group 2.
| Group 1 | Group 2 |
| P. Cup and cone | 1. Creep failure |
| Q. Beach marks | 2. Brittle failure |
| R. Clevage | 3. Normal ductile failure |
| S. Triple point cracking | 4. Completely ductile failure |
| 5. Fatigue failure |
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The pressure required to maintain flow during indirect extrusion
P. decreases with decreasing rate of the billet
Q. Increases with increasing extrusion ratio
R. is independent of the length of the billet
S. is independent of the extrusion ratio
P. decreases with decreasing rate of the billet
Q. Increases with increasing extrusion ratio
R. is independent of the length of the billet
S. is independent of the extrusion ratio
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The typical dislocation density (lines/cm2) of a hot rolled material is
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Amongst the following equipments, the productivity is the maximum for
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Match the loading conditions in Group 1 with the characteristics in Group 2.
| Group 1 | Group 2 |
| P. Tensile | 1. Barelling |
| Q. Compressive | 2. Intergrannular cracking |
| R. Fatigue | 3. Striations |
| S. Creep | 4. Cup and cone |
| 5. Earing |
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Extrusion pressure is proportional to
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A 480 mm thick slab is hot-rolled using a roll of 720 mm diameter. For a coefficient of friction of 0.5, the maximum possible reduction (in mm) is
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Determine the correctness or otherwise of the following Assertion (a) and Reason (r).
Assertion: During rolling, front tension and (or) back tension are (is) employed to decrease rolling load.
Reason: Roll pressure decreases due to lowering of flow stress as a result of front tension/back tension.
Assertion: During rolling, front tension and (or) back tension are (is) employed to decrease rolling load.
Reason: Roll pressure decreases due to lowering of flow stress as a result of front tension/back tension.
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Match the terms in Group 1 to their descriptions in Group 2.
| Group 1 | Group 2 |
| P. Hall-Petch effect | 1. Solute dislocation interaction |
| Q. Bauschinger effect | 2. Dislocation multiplication |
| R. Cottreli atmosphere | 3. Grain boundary strengthening |
| 4. Barelling under compression | |
| 5. Mechanical hysterisis during plasticity |
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Fatigue resistance of a steel is reduced by
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Flash in a close die forging.
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Match the stress state with the corresponding forming process.
| P. Direct compressive | 1. Wire drawing |
| Q. Indirect compressive | 2. Sheet blanking |
| R. Tensile | 3. Forging |
| S. Shear | 4. Stretch forming |
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The spring back phenomenon in metal sheet bending can be compensated by
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Match the items in Group 1 with the manufacturing processes in Group 2.
| Group 1 | Group 2 |
| P. Upsetting operation | 1. Extrusion |
| Q. Port hole die | 2. Forging |
| R. Bullblock | 3. Rolling |
| S. Orange peel effect | 4. Wire drawing |
| 5. Deep drawing | |
| 6. Sheet forming |
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In extrusion of metals, which of the following statement(s) is/are true?
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Match the defects listed in Group I with the processes listed in Group II.
| Group I | Group II |
| P. Cold Shut | 1. Rolling |
| Q. Earing | 2. Forging |
| R. Alligatoring | 3. Deep drawing |
| S. Shrinkage porosity | 4. Fusion welding |
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Match the manufacturing process of Group I to be used for producing the product for Group II.
| Group I | Group II |
| P. Drawing | 1. Large curved disc |
| Q. Forging | 2. Tube |
| R. Rolling | 3. Crank shaft |
| S. Stretch forming | 4. Plate |
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An ingot is hot forged to a 60% reduction in cross-section area. The percentage reduction in the volume for the above process is
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