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Assertion (A): There is good grain refinement in hot working.
Reason (R): In hot working physical properties are generally improved.
Reason (R): In hot working physical properties are generally improved.
- a)Both A and R are true and R is the correct explanation of A
- b)Both A and R arc true but R is NOT the correct explanation of A
- c)A is true hut R is false
- d)A is false but R is true
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Assertion (A): There is good grain refinement in hot working.Reason (R...
Explanation:
Hot Working:
Hot working is the process of changing the shape of a metal by plastic deformation at high temperatures. The temperature range for hot working is generally above the recrystallization temperature of the metal being worked on. The recrystallization temperature is the temperature at which the new grains are formed, and the old ones are replaced. In hot working, the metal is heated above this temperature, so the recrystallization process takes place faster, and the grains produced are smaller in size.
Grain Refinement:
Grain refinement is the process of reducing the grain size of a metal. Grain refinement is important because it has a significant effect on the mechanical properties of a metal. Smaller grain sizes result in higher strength and ductility, and also improve the toughness of the material. Grain refinement can be achieved by a number of methods, such as adding grain-refining agents, controlling the cooling rate during solidification, and hot working.
Assertion and Reason:
Assertion: There is good grain refinement in hot working.
Reason: In hot working physical properties are generally improved.
Explanation of Assertion:
In hot working, the metal is heated above its recrystallization temperature, which leads to faster recrystallization, resulting in smaller grain sizes. This is because the recrystallization process is driven by the movement of the dislocations in the metal. At high temperatures, the dislocations can move more easily, resulting in faster recrystallization. Smaller grain sizes improve the mechanical properties of the metal, making it stronger and more ductile. Therefore, it can be concluded that there is good grain refinement in hot working.
Explanation of Reason:
In hot working, the metal is heated to high temperatures, which causes the metal to become more ductile and easier to work with. This results in physical properties of the metal being improved. The improved properties include higher strength, improved ductility, and better toughness. Therefore, it can be concluded that physical properties are generally improved in hot working.
Conclusion:
Both the Assertion and Reason are true, and the Reason is the correct explanation of the Assertion. Therefore, the correct answer is option (A).
Hot Working:
Hot working is the process of changing the shape of a metal by plastic deformation at high temperatures. The temperature range for hot working is generally above the recrystallization temperature of the metal being worked on. The recrystallization temperature is the temperature at which the new grains are formed, and the old ones are replaced. In hot working, the metal is heated above this temperature, so the recrystallization process takes place faster, and the grains produced are smaller in size.
Grain Refinement:
Grain refinement is the process of reducing the grain size of a metal. Grain refinement is important because it has a significant effect on the mechanical properties of a metal. Smaller grain sizes result in higher strength and ductility, and also improve the toughness of the material. Grain refinement can be achieved by a number of methods, such as adding grain-refining agents, controlling the cooling rate during solidification, and hot working.
Assertion and Reason:
Assertion: There is good grain refinement in hot working.
Reason: In hot working physical properties are generally improved.
Explanation of Assertion:
In hot working, the metal is heated above its recrystallization temperature, which leads to faster recrystallization, resulting in smaller grain sizes. This is because the recrystallization process is driven by the movement of the dislocations in the metal. At high temperatures, the dislocations can move more easily, resulting in faster recrystallization. Smaller grain sizes improve the mechanical properties of the metal, making it stronger and more ductile. Therefore, it can be concluded that there is good grain refinement in hot working.
Explanation of Reason:
In hot working, the metal is heated to high temperatures, which causes the metal to become more ductile and easier to work with. This results in physical properties of the metal being improved. The improved properties include higher strength, improved ductility, and better toughness. Therefore, it can be concluded that physical properties are generally improved in hot working.
Conclusion:
Both the Assertion and Reason are true, and the Reason is the correct explanation of the Assertion. Therefore, the correct answer is option (A).
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Community Answer
Assertion (A): There is good grain refinement in hot working.Reason (R...
It is true because hot working is done above the recrystallisation temperature in which the strained grain are rifened as well as new grains are formed which are having great physical property.
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Assertion (A): There is good grain refinement in hot working.Reason (R): In hot working physical properties are generally improved.a)Both A and R are true and R is the correct explanation of Ab)Both A and R arc true but R is NOT the correct explanation of Ac)A is true hut R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer?
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