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10 Cards in this Set
- Front
- Back
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Hot working Cold working 1. Temperature Hot working of metals and alloys occurs --- temperature (approximately ---Tm to---Tm, where, Tm is ---). Cold working is --- below the --- temperature. |
above re-crystallization (0.3 Tm to 0.5 Tm) melting temperature plastic deformation recrystallization |
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2. Grain Hot working results --- grain structure. Grains are not equiaxed, they are ---ed and ---ed. |
equiaxed elongated and distorted |
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3.Material properties Hot working results no appreciable change in material properties because the effect of deformation (or ---) are removed by ---. The strength and hardness of materials increases with decrease in --- and impact strength due to ---. |
(strain hardening) recrystallization ductility strain hardening |
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4.Thin section Very thin sections can be hot worked without ---. If very thin section is cold worked then --- occurs due to strain hardening. |
cracking fracture |
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5.Cost It is a cheaper method because it require --- This process requires ---, it is a costly method. |
low-power mills more power |
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6. Surface finish Surface finish is not good due to --- at high temperature. -- surface finish is obtained. |
oxidation Very good |
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7. chemical homogeneity The chemical homogeneity is --- due to hot working. The chemical homogeneity is ---. |
lost retained |
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8. Annealing Annealing is done after cold working because properties are--- during cold working. Further annealing is not required because properties 000 after hot working. |
changed remain more or less same |
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9. coefficient The coefficient of friction in hot working is as high as--- The coefficient of friction in cold working is generally of the order ---. |
0.6. 0.1 |
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10. Cracks Cracks and blowholes are ---. Possibility of crack formation and its --- is great. |
welded up propagation |
