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Consider the following characteristics of rolling process:
1. Shows work hardening effect
2. Surface finish is not good
3. Heavy reduction in areas can be obtained
2. Surface finish is not good
3. Heavy reduction in areas can be obtained
Q.
Which of these characteristics are associated with hot rolling?
- a)1 and 2
- b)1 and 3
- c)2 and 3
- d)1, 2 and 3
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Consider the following characteristics of rolling process:1. Shows wor...
Hot Rolling Characteristics
Work Hardening Effect:
- Hot rolling process involves the deformation of the metal above its recrystallization temperature.
- During this process, the metal grains undergo plastic deformation, which leads to the work hardening effect.
- Work hardening refers to an increase in the strength and hardness of the metal due to plastic deformation.
- This characteristic is associated with hot rolling.
Surface Finish:
- Hot rolling process involves the use of high temperatures, which can cause surface defects and oxidation.
- Surface finish is not good in hot rolling as compared to cold rolling.
- This is because hot rolling leaves behind a scale on the surface of the metal, which needs to be removed by further processing.
- This characteristic is associated with hot rolling.
Heavy Reduction:
- Heavy reduction in areas can be obtained in hot rolling.
- This is because the metal is in a ductile state above its recrystallization temperature, and can undergo significant deformation without fracturing.
- Heavy reduction is the primary objective of hot rolling, as it helps to achieve the desired shape and dimensions of the metal.
- This characteristic is associated with hot rolling.
Conclusion:
From the above discussion, we can conclude that characteristics 2 and 3 are associated with hot rolling, while characteristic 1 is associated with both hot and cold rolling. Therefore, the correct answer is option 'C' (2 and 3).
Work Hardening Effect:
- Hot rolling process involves the deformation of the metal above its recrystallization temperature.
- During this process, the metal grains undergo plastic deformation, which leads to the work hardening effect.
- Work hardening refers to an increase in the strength and hardness of the metal due to plastic deformation.
- This characteristic is associated with hot rolling.
Surface Finish:
- Hot rolling process involves the use of high temperatures, which can cause surface defects and oxidation.
- Surface finish is not good in hot rolling as compared to cold rolling.
- This is because hot rolling leaves behind a scale on the surface of the metal, which needs to be removed by further processing.
- This characteristic is associated with hot rolling.
Heavy Reduction:
- Heavy reduction in areas can be obtained in hot rolling.
- This is because the metal is in a ductile state above its recrystallization temperature, and can undergo significant deformation without fracturing.
- Heavy reduction is the primary objective of hot rolling, as it helps to achieve the desired shape and dimensions of the metal.
- This characteristic is associated with hot rolling.
Conclusion:
From the above discussion, we can conclude that characteristics 2 and 3 are associated with hot rolling, while characteristic 1 is associated with both hot and cold rolling. Therefore, the correct answer is option 'C' (2 and 3).
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Community Answer
Consider the following characteristics of rolling process:1. Shows wor...
In hot rolling operations, the working temperatures are very high, i.e higher than the recrystallization temperature of most metals. Thus as the temperature (T) increases:
1. The work hardening (n) decreases
2. When the metal cools down to room temperature from the re-crystallization temperature it forms a scaled surface which is also caused due to the friction while working. Surface finish is not good.
3. It becomes easier to work with the metals, heavy reductions in areas can be obtained.
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Consider the following characteristics of rolling process:1. Shows work hardening effect2. Surface finish is not good3. Heavy reduction in areas can be obtainedQ.Which of these characteristics are associated with hot rolling?a)1 and 2b)1 and 3c)2 and 3d)1, 2 and 3Correct answer is option 'C'. Can you explain this answer?
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Consider the following characteristics of rolling process:1. Shows work hardening effect2. Surface finish is not good3. Heavy reduction in areas can be obtainedQ.Which of these characteristics are associated with hot rolling?a)1 and 2b)1 and 3c)2 and 3d)1, 2 and 3Correct answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Consider the following characteristics of rolling process:1. Shows work hardening effect2. Surface finish is not good3. Heavy reduction in areas can be obtainedQ.Which of these characteristics are associated with hot rolling?a)1 and 2b)1 and 3c)2 and 3d)1, 2 and 3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following characteristics of rolling process:1. Shows work hardening effect2. Surface finish is not good3. Heavy reduction in areas can be obtainedQ.Which of these characteristics are associated with hot rolling?a)1 and 2b)1 and 3c)2 and 3d)1, 2 and 3Correct answer is option 'C'. Can you explain this answer?.
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