Mechanical Engineering Exam > Mechanical Engineering Questions > Which of the following are true?a)Cold workin...
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Which of the following are true?
- a)Cold working reduces toughness and ductility
- b)Cold worked components have poor resistance to shocks and vibrations
- c)Tooling for cold working is cheaper as compared to hot working
- d)All of the mentioned
Correct answer is option 'D'. Can you explain this answer?
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Which of the following are true?a)Cold working reduces toughness and d...
Explanation: Properties of cold working.
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Which of the following are true?a)Cold working reduces toughness and d...
Cold working is a process of deforming metals at a temperature below their recrystallization temperature. The following statements are true regarding cold working:
1. Cold working reduces toughness and ductility:
- When a metal is cold worked, its grain structure is deformed and distorted, leading to a reduction in its toughness and ductility.
- This is because the deformation causes dislocations in the crystal lattice structure of the metal, which hinder the movement of atoms and make it more difficult for the metal to undergo further plastic deformation.
2. Cold worked components have poor resistance to shocks and vibrations:
- Cold worked components are more susceptible to cracking and failure under shock and vibration loading, due to their reduced toughness and ductility.
- This makes them less suitable for applications where they will be subjected to high stress or impact loading.
3. Tooling for cold working is cheaper as compared to hot working:
- Tooling for cold working is generally less expensive than tooling for hot working, as cold working does not require high temperatures or specialized equipment.
- This makes cold working a more cost-effective option for producing small to medium-sized components.
Therefore, the correct answer is option 'D': all of the mentioned statements are true regarding cold working.
1. Cold working reduces toughness and ductility:
- When a metal is cold worked, its grain structure is deformed and distorted, leading to a reduction in its toughness and ductility.
- This is because the deformation causes dislocations in the crystal lattice structure of the metal, which hinder the movement of atoms and make it more difficult for the metal to undergo further plastic deformation.
2. Cold worked components have poor resistance to shocks and vibrations:
- Cold worked components are more susceptible to cracking and failure under shock and vibration loading, due to their reduced toughness and ductility.
- This makes them less suitable for applications where they will be subjected to high stress or impact loading.
3. Tooling for cold working is cheaper as compared to hot working:
- Tooling for cold working is generally less expensive than tooling for hot working, as cold working does not require high temperatures or specialized equipment.
- This makes cold working a more cost-effective option for producing small to medium-sized components.
Therefore, the correct answer is option 'D': all of the mentioned statements are true regarding cold working.
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Which of the following are true?a)Cold working reduces toughness and ductilityb)Cold worked components have poor resistance to shocks and vibrationsc)Tooling for cold working is cheaper as compared to hot workingd)All of the mentionedCorrect answer is option 'D'. Can you explain this answer?
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