The flow stress (σ) of an alloy varies with strain rate as σ = 100 MPa. When the alloy is hot extruded from 10cm diameter to 5 cm diameter at a speed of 2 cm/s, the flow stress is
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Metallurgical Engineering · all questionsMechanical Metallurgy
Mechanical Metallurgy
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For successful rolling, the condition required is
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A metal powder with an apparent density of 2.5 g/cm3 was compacted in a cylindrical die to a green density of 5.5 g/cm3, If the height of the green sample was 12 mm, then the fill height of powder (in mm) would have been
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Tungsten filament wire for lamp industry is commonly produced by
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Match the following:
| Group 1 | Group 2 |
| P. Direct extrusion | 1. Motion of ram and work piece in the same direction |
| Q. Impact extrusion | 2. Motion of ram and work pieces in the opposite direction |
| R. Tube drawing | 3. No containerwall friction |
| S. Hydrostatic extrusion | 4. Use of mandrel |
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A planetary mill is used for
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An aluminium billet of 300 mm diameter is extruded with an extrusion ratio of 16. What is the diameter of the final product?
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Match the process with the property required.
| P. Cold rolling | 1. Wettability |
| Q. Milling | 2. Ductility |
| R. Brazing | 3. Comparability |
| S. Powder metallurgy | 4. Machinability |
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Match the phenomenon with typically observed features
| P. Fatigue fracture | 1. Earing |
| Q. Yield point phenomenon | 2. Dimple structure |
| R. Ductile fracture | 3. Beach marks |
| S. Deep drawing of a sheet | 4. Luder's band |
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The strain hardening behaviour of an annealed rod during cold rolling is given by σ = 700 MPa. where σ is the flow stress at strain .
Flow stress after 50% reduction in area of the annealed rod on cold rolling is approximately
Flow stress after 50% reduction in area of the annealed rod on cold rolling is approximately
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Match the following:
| P. Forging | 1. Rails |
| Q. Rolling | 2. Plane wires |
| R. Extrusion | 3. Crankshaft |
| S. Deep drawing Product | 4. Toothpaste tube |
| 5. LPG cylinder |
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Match the items in Group 1 with the manufacturing process in Group 2.
| Group 1 | Group 2 |
| P. I-section for structural work | 1. Forging |
| Q. Base plates for heavy machines | 2. Rolling |
| R. Self lubricating bearings | 3. Casting |
| S. Rotor for turbine | 4. Powder metallurgy |
| 5. Extrusion |
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