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On completion of heat treatment, the resulting structure will have retained austenite if the
- a)rate of cooling is greater than the critical cooling rate
- b)rate of cooling is less than the cooling rate
- c)martensite formation starting temperature is above the room temperature
- d)martensite formation finishing temperature is below the room temperature
Correct answer is option 'D'. Can you explain this answer?
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On completion of heat treatment, the resulting structure will have re...
Explanation:
Retained austenite: Austenite is a phase of steel that is stable at high temperatures. It is a face-centered cubic (FCC) structure. During heat treatment, if the cooling rate is not sufficient, some of the austenite may remain untransformed and retained in the final structure.
Effect of cooling rate: The rate of cooling during heat treatment plays a crucial role in the transformation of austenite. The critical cooling rate is the minimum rate at which austenite can transform to martensite, a hard and brittle phase. If the cooling rate is greater than the critical cooling rate, the austenite will transform completely to martensite. On the other hand, if the cooling rate is slower than the critical cooling rate, some of the austenite may remain untransformed and retained in the final structure.
Martensite formation starting temperature: Martensite formation starts at a temperature known as the martensite start temperature (Ms). This temperature is below the room temperature. If the martensite start temperature is above the room temperature, it means that the transformation of austenite to martensite will not occur during cooling to room temperature. Therefore, retained austenite can be present in the final structure.
Martensite formation finishing temperature: Martensite formation finishes at a temperature known as the martensite finish temperature (Mf). This temperature is also below the room temperature. If the martensite finish temperature is below the room temperature, it means that the transformation of austenite to martensite will not be completed during cooling. Again, this leads to the presence of retained austenite in the final structure.
Conclusion: Based on the given options, the correct answer is option D. If the martensite formation finishing temperature is below the room temperature, it indicates that the transformation of austenite to martensite will not be completed during cooling, resulting in the retention of austenite in the final structure.
Retained austenite: Austenite is a phase of steel that is stable at high temperatures. It is a face-centered cubic (FCC) structure. During heat treatment, if the cooling rate is not sufficient, some of the austenite may remain untransformed and retained in the final structure.
Effect of cooling rate: The rate of cooling during heat treatment plays a crucial role in the transformation of austenite. The critical cooling rate is the minimum rate at which austenite can transform to martensite, a hard and brittle phase. If the cooling rate is greater than the critical cooling rate, the austenite will transform completely to martensite. On the other hand, if the cooling rate is slower than the critical cooling rate, some of the austenite may remain untransformed and retained in the final structure.
Martensite formation starting temperature: Martensite formation starts at a temperature known as the martensite start temperature (Ms). This temperature is below the room temperature. If the martensite start temperature is above the room temperature, it means that the transformation of austenite to martensite will not occur during cooling to room temperature. Therefore, retained austenite can be present in the final structure.
Martensite formation finishing temperature: Martensite formation finishes at a temperature known as the martensite finish temperature (Mf). This temperature is also below the room temperature. If the martensite finish temperature is below the room temperature, it means that the transformation of austenite to martensite will not be completed during cooling. Again, this leads to the presence of retained austenite in the final structure.
Conclusion: Based on the given options, the correct answer is option D. If the martensite formation finishing temperature is below the room temperature, it indicates that the transformation of austenite to martensite will not be completed during cooling, resulting in the retention of austenite in the final structure.
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On completion of heat treatment, the resulting structure will have re...
If martensite finishing temperature is below the room temperature, the martensite formation will not complete and the structure will retain austnite.
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On completion of heat treatment, the resulting structure will have retained austenite if thea)rate of cooling is greater than the critical cooling rateb)rate of cooling is less than the cooling ratec)martensite formation starting temperature is above the room temperatured)martensite formation finishing temperature is below the room temperatureCorrect answer is option 'D'. Can you explain this answer?
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On completion of heat treatment, the resulting structure will have retained austenite if thea)rate of cooling is greater than the critical cooling rateb)rate of cooling is less than the cooling ratec)martensite formation starting temperature is above the room temperatured)martensite formation finishing temperature is below the room temperatureCorrect answer is option 'D'. 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 On completion of heat treatment, the resulting structure will have retained austenite if thea)rate of cooling is greater than the critical cooling rateb)rate of cooling is less than the cooling ratec)martensite formation starting temperature is above the room temperatured)martensite formation finishing temperature is below the room temperatureCorrect answer is option 'D'. 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 On completion of heat treatment, the resulting structure will have retained austenite if thea)rate of cooling is greater than the critical cooling rateb)rate of cooling is less than the cooling ratec)martensite formation starting temperature is above the room temperatured)martensite formation finishing temperature is below the room temperatureCorrect answer is option 'D'. Can you explain this answer?.
On completion of heat treatment, the resulting structure will have retained austenite if thea)rate of cooling is greater than the critical cooling rateb)rate of cooling is less than the cooling ratec)martensite formation starting temperature is above the room temperatured)martensite formation finishing temperature is below the room temperatureCorrect answer is option 'D'. 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 On completion of heat treatment, the resulting structure will have retained austenite if thea)rate of cooling is greater than the critical cooling rateb)rate of cooling is less than the cooling ratec)martensite formation starting temperature is above the room temperatured)martensite formation finishing temperature is below the room temperatureCorrect answer is option 'D'. 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 On completion of heat treatment, the resulting structure will have retained austenite if thea)rate of cooling is greater than the critical cooling rateb)rate of cooling is less than the cooling ratec)martensite formation starting temperature is above the room temperatured)martensite formation finishing temperature is below the room temperatureCorrect answer is option 'D'. Can you explain this answer?.
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