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Cold working of steel is defined as working
- a)at its recrystallisation temperature
- b)above its recrystallisation temperature
- c)below its recrystallisation temperature
- d)at two thirds of the melting temperature of the metal
Correct answer is option 'C'. Can you explain this answer?
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Cold working of steel is defined as workinga)at its recrystallisation ...
When the processing temperature of the mechanical deformation of steel is above the recrystallization temperature, the process is termed as hot working; otherwise, it is cold working. For hot working processes, large deformation can be successively repeated, as the metal remains soft and ductile.
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Cold working of steel is defined as workinga)at its recrystallisation ...
Cold Working of Steel
Definition: Cold working of steel refers to the process of shaping or forming steel at a temperature below its recrystallization temperature.
Explanation:
Recrystallization Temperature:
The recrystallization temperature of a metal is the temperature at which new grains are formed in the metal's microstructure, replacing the deformed grains that were created during previous processing or working. At this temperature, the metal's internal stresses are relieved, and the material becomes softer and more ductile.
Options:
- a) At its recrystallization temperature: This is not the correct option. Working steel at its recrystallization temperature is known as hot working, not cold working.
- b) Above its recrystallization temperature: This is also not the correct option. Working above the recrystallization temperature is considered as hot working.
- c) Below its recrystallization temperature: This is the correct option. Cold working involves shaping or forming steel at a temperature below its recrystallization temperature. It is performed at room temperature or slightly above.
- d) At two-thirds of the melting temperature of the metal: This is an incorrect option. Working at two-thirds of the melting temperature is not specific to cold working and can refer to various temperature ranges depending on the metal.
Advantages of Cold Working:
- Increase in strength: Cold working leads to strain hardening, which increases the strength and hardness of the steel.
- Improved dimensional accuracy: Cold working can provide better control over the dimensions and tolerances of the final product.
- Improved surface finish: Cold working can result in a smoother and more uniform surface finish.
- Increased yield strength: Cold working can increase the yield strength of the steel, making it less prone to deformation under load.
Applications of Cold Working:
Cold working is commonly used in various industries for shaping and forming steel into different products, such as:
- Sheet metal fabrication
- Wire drawing
- Cold forging
- Extrusion
- Cold rolling
Overall, cold working of steel is a valuable process that offers several benefits and is widely used in the manufacturing industry for producing a wide range of products.
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Cold working of steel is defined as workinga)at its recrystallisation temperatureb)above its recrystallisation temperaturec)below its recrystallisation temperatured)at two thirds of the melting temperature of the metalCorrect answer is option 'C'. Can you explain this answer?
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