In a tensile test of ductile material, necking starts at
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Metallurgical Engineering · all questionsMechanical Metallurgy
Mechanical Metallurgy
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A metallic sheet 1 m wide and 10 mm thick is to be rolled under a front tension force of 100 KN. A specimen from the sheet, tested under tension, shows a yield stress of 100 MPa. Assume plain strain condition during rolling and ignore the friction. If yielding is assumed to start at a roll pressure of σ3 MPa, then the stress in the width direction (where strain is zero) is
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Match the forming methods in Group 1 with the defects in Group 2.
| Group 1 | Group 2 |
| P. Extrusion | 1. Flash cracking |
| Q. Closed die forging | 2. Fir-tree cracking |
| R. Rolling | 3. Alligatoring |
| 4. Earing |
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The maximum axial compression stress during cold upsetting of a cylindrical rod of radius, 'r', occurs at
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The defects that are not observed in extruded products are
P. Chevron cracking
Q. Fold
R. Piping
S. Surface cracking
T. Alligatoring
P. Chevron cracking
Q. Fold
R. Piping
S. Surface cracking
T. Alligatoring
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Which of the following metal forming techniques is used to produce soft drink cans from aluminium sheets?
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Match the defects listed in Group I with the corresponding manufacturing process listed in Group II.
| Group I | Group II |
| P. Orange-peel effect | 1. Extrusion |
| Q. Chevron cracking | 2. Deep drawing |
| R. Flash | 3. Arc welding |
| S. Undercut | 4. Forging |
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Railway tracks are typically manufactured using
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The rolling process can not be used to produce
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The yield point phenomenon observed in annealed low carbon steels is due to the presence of
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Match the product in Group 1 and the main manufacturing process in Group 2.
| Group 1 | Group 2 |
| P. Cement kilns | 1. Rolling and welding |
| Q. Gas pipelines | 2. Casting and welding |
| R. Cycle rims | 3. Forging and welding |
| S. Seamless pipe | 4. Extrusion and welding |
| 5. Forging and extrusion |
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Fatigue strength of steel can be'increased by
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Which of the following metal working operations can be categorized as an indirect compression process?
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Classification of metal forming processes into hot and cold working is based on the following parameter.
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As the % reduction increases, the flow stress during hot isothermal forging of a metal
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Often earing defects are found during deep drawing operation, because the
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For the occurence of "bite" in rolling, the following condition should be satisfied.
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For ingot breakdown by hot rolling, the rolls are generally grooved paralled to the roll axis in order to
P. increase the arigle of bite
Q. decrease the rolling load
R. achieve larger reduction
S. decrease roll flattening
P. increase the arigle of bite
Q. decrease the rolling load
R. achieve larger reduction
S. decrease roll flattening
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Identify the statement that precisely describes the principle of hot working of metals and alloys.
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The co-efficient of friction alters by 5 times when a slab is hot rolled instead of cold rolling in a specific rolling mill. The maximum reduction in the thickness of the slab will increase by a factor of
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