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Which one of the following sets if constituents is expected in equilibrium cooling of 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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Understanding Hypereutectoid Steel
Hypereutectoid steel contains more than 0.76% carbon. When this type of steel is cooled from the austenitic state, it undergoes transformations that determine its microstructural constituents.
Equilibrium Cooling Process
- During equilibrium cooling, the steel cools slowly enough for transformations to occur without any non-equilibrium phases forming.
- The austenite phase (γ-Fe) transforms into different microstructures depending on the carbon content and cooling rate.
Expected Phases in Hypereutectoid Steel
- For hypereutectoid steel, the constituents under equilibrium conditions upon cooling from the austenitic state include:
- Cementite (Fe₃C): A hard, brittle intermetallic compound that forms from the excess carbon present.
- Pearlite: A mixture of ferrite and cementite, which forms at lower temperatures.
Correct Answer: Cementite and Pearlite
- As the austenitic steel cools, the following occurs:
- The excess carbon precipitates as cementite.
- The remaining austenite transforms into pearlite as it continues to cool.
- Thus, the expected microstructural constituents in equilibrium cooling of hypereutectoid steel from the austenitic state are cementite and pearlite.
Conclusion
In summary, option 'B' is correct because hypereutectoid steel, upon cooling, will predominantly consist of cementite and pearlite, highlighting the significance of carbon content in determining the microstructure.
Hypereutectoid steel contains more than 0.76% carbon. When this type of steel is cooled from the austenitic state, it undergoes transformations that determine its microstructural constituents.
Equilibrium Cooling Process
- During equilibrium cooling, the steel cools slowly enough for transformations to occur without any non-equilibrium phases forming.
- The austenite phase (γ-Fe) transforms into different microstructures depending on the carbon content and cooling rate.
Expected Phases in Hypereutectoid Steel
- For hypereutectoid steel, the constituents under equilibrium conditions upon cooling from the austenitic state include:
- Cementite (Fe₃C): A hard, brittle intermetallic compound that forms from the excess carbon present.
- Pearlite: A mixture of ferrite and cementite, which forms at lower temperatures.
Correct Answer: Cementite and Pearlite
- As the austenitic steel cools, the following occurs:
- The excess carbon precipitates as cementite.
- The remaining austenite transforms into pearlite as it continues to cool.
- Thus, the expected microstructural constituents in equilibrium cooling of hypereutectoid steel from the austenitic state are cementite and pearlite.
Conclusion
In summary, option 'B' is correct because hypereutectoid steel, upon cooling, will predominantly consist of cementite and pearlite, highlighting the significance of carbon content in determining the microstructure.
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Which one of the following sets if constituents is expected in equilibrium cooling of 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?
Question Description
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Which one of the following sets if constituents is expected in equilibrium cooling of 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 if constituents is expected in equilibrium cooling of 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 if constituents is expected in equilibrium cooling of 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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