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Which one of the following sets of constituents is expected in equilibrium coolingof a hypereutectoid steel from austenitic state?
- a)Ferrite and pearlite
- b)Cementite and pearlite
- c)Ferrite and bainite
- d)Cementite and martensite
Correct answer is option 'B'. Can you explain this answer?
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Equilibrium Cooling of Hypereutectoid Steel:
When a hypereutectoid steel is cooled from its austenitic state, the following constituents are expected to form at equilibrium:
1. Cementite:
- Cementite is a hard and brittle compound of iron and carbon.
- It has a fixed composition of Fe3C.
- During the cooling of a hypereutectoid steel, cementite forms first when the temperature drops below the eutectoid point.
2. Pearlite:
- Pearlite is a lamellar mixture of ferrite and cementite.
- It forms when the temperature drops below the eutectoid point and the austenite transforms into pearlite.
- The amount of pearlite formed depends on the cooling rate; slower cooling results in more pearlite.
Expected Constituents in Equilibrium Cooling of Hypereutectoid Steel:
Out of the given options, the expected constituents in equilibrium cooling of a hypereutectoid steel from its austenitic state are cementite and pearlite. This is because:
- Option A (ferrite and pearlite) is incorrect as ferrite is not expected to form in hypereutectoid steels due to the high carbon content.
- Option C (ferrite and bainite) is incorrect as bainite forms at a faster cooling rate than equilibrium cooling.
- Option D (cementite and martensite) is incorrect as martensite forms at a very high cooling rate and is not expected to form during equilibrium cooling.
Therefore, option B (cementite and pearlite) is the correct answer.
When a hypereutectoid steel is cooled from its austenitic state, the following constituents are expected to form at equilibrium:
1. Cementite:
- Cementite is a hard and brittle compound of iron and carbon.
- It has a fixed composition of Fe3C.
- During the cooling of a hypereutectoid steel, cementite forms first when the temperature drops below the eutectoid point.
2. Pearlite:
- Pearlite is a lamellar mixture of ferrite and cementite.
- It forms when the temperature drops below the eutectoid point and the austenite transforms into pearlite.
- The amount of pearlite formed depends on the cooling rate; slower cooling results in more pearlite.
Expected Constituents in Equilibrium Cooling of Hypereutectoid Steel:
Out of the given options, the expected constituents in equilibrium cooling of a hypereutectoid steel from its austenitic state are cementite and pearlite. This is because:
- Option A (ferrite and pearlite) is incorrect as ferrite is not expected to form in hypereutectoid steels due to the high carbon content.
- Option C (ferrite and bainite) is incorrect as bainite forms at a faster cooling rate than equilibrium cooling.
- Option D (cementite and martensite) is incorrect as martensite forms at a very high cooling rate and is not expected to form during equilibrium cooling.
Therefore, option B (cementite and pearlite) is the correct answer.
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Which one of the following sets of constituents is expected in equilibrium coolingof a hypereutectoid steel from austenitic state?a)Ferrite and pearliteb)Cementite and pearlitec)Ferrite and bainited)Cementite and martensiteCorrect answer is option 'B'. Can you explain this answer?
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Which one of the following sets of constituents is expected in equilibrium coolingof a hypereutectoid steel from austenitic state?a)Ferrite and pearliteb)Cementite and pearlitec)Ferrite and bainited)Cementite and martensiteCorrect answer is option 'B'. 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 Which one of the following sets of constituents is expected in equilibrium coolingof a hypereutectoid steel from austenitic state?a)Ferrite and pearliteb)Cementite and pearlitec)Ferrite and bainited)Cementite and martensiteCorrect answer is option 'B'. 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 Which one of the following sets of constituents is expected in equilibrium coolingof a hypereutectoid steel from austenitic state?a)Ferrite and pearliteb)Cementite and pearlitec)Ferrite and bainited)Cementite and martensiteCorrect answer is option 'B'. Can you explain this answer?.
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Which one of the following sets of constituents is expected in equilibrium coolingof a hypereutectoid steel from austenitic state?a)Ferrite and pearliteb)Cementite and pearlitec)Ferrite and bainited)Cementite and martensiteCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for Which one of the following sets of constituents is expected in equilibrium coolingof a hypereutectoid steel from austenitic state?a)Ferrite and pearliteb)Cementite and pearlitec)Ferrite and bainited)Cementite and martensiteCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of Which one of the following sets of constituents is expected in equilibrium coolingof a hypereutectoid steel from austenitic state?a)Ferrite and pearliteb)Cementite and pearlitec)Ferrite and bainited)Cementite and martensiteCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
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