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Two plain carbon steel specimens having 0·8% carbon content are welded. If weobserve the weldment under Metallurgical Microscope from centre towards eitherside, the following structures are observed at different zones:
1. Fine Pearlite
2. Coarse Pearlite
3. Martensite
Select the correct sequence using the codes given below:
Codes:
1. Fine Pearlite
2. Coarse Pearlite
3. Martensite
Select the correct sequence using the codes given below:
Codes:
- a)1, 2, 3
- b)1, 3, 2
- c)2, 1, 3
- d)3, 1, 2
Correct answer is option 'D'. Can you explain this answer?
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Two plain carbon steel specimens having 0·8% carbon content are w...
Ans. (d)
Maximum cooling rate produces Martensite
Medium cooling rate produces Fine pearlite
Low cooling rate produces coarse pearlite.
Maximum cooling rate produces Martensite
Medium cooling rate produces Fine pearlite
Low cooling rate produces coarse pearlite.
Most Upvoted Answer
Two plain carbon steel specimens having 0·8% carbon content are w...
The correct sequence of structures observed in the weldment of two plain carbon steel specimens with 0.8% carbon content is 3, 1, 2. This means that martensite is observed first, followed by fine pearlite, and then coarse pearlite.
1. Martensite:
Martensite is a hard and brittle microstructure that forms when carbon steel is rapidly cooled from a high temperature. In the weldment, the center region experiences rapid cooling due to the heat dissipation from the surrounding areas, resulting in the formation of martensite. Martensite has a needle-like or lath-like appearance under a metallurgical microscope.
2. Fine Pearlite:
Fine pearlite is a microstructure that forms when carbon steel is slowly cooled. It consists of alternating layers of ferrite and cementite. The fine pearlite structure is observed in the region adjacent to the martensite zone. The slower cooling rate allows for the formation of smaller and more closely spaced cementite lamellae, resulting in a finer microstructure.
3. Coarse Pearlite:
Coarse pearlite is another microstructure that forms when carbon steel is slowly cooled, but with a slower cooling rate than fine pearlite. It also consists of alternating layers of ferrite and cementite, but the lamellae are larger and more widely spaced compared to fine pearlite. The coarse pearlite structure is observed in the region further away from the martensite zone.
The sequence of structures observed from the center towards either side of the weldment is therefore 3 (martensite), 1 (fine pearlite), 2 (coarse pearlite). This sequence is determined by the cooling rate experienced by the steel during the welding process. The center region cools rapidly, leading to the formation of martensite, while the adjacent regions cool at slower rates, resulting in the formation of pearlite microstructures. The difference in cooling rates is responsible for the variation in the size and spacing of the cementite lamellae, leading to the differences in microstructure observed.
1. Martensite:
Martensite is a hard and brittle microstructure that forms when carbon steel is rapidly cooled from a high temperature. In the weldment, the center region experiences rapid cooling due to the heat dissipation from the surrounding areas, resulting in the formation of martensite. Martensite has a needle-like or lath-like appearance under a metallurgical microscope.
2. Fine Pearlite:
Fine pearlite is a microstructure that forms when carbon steel is slowly cooled. It consists of alternating layers of ferrite and cementite. The fine pearlite structure is observed in the region adjacent to the martensite zone. The slower cooling rate allows for the formation of smaller and more closely spaced cementite lamellae, resulting in a finer microstructure.
3. Coarse Pearlite:
Coarse pearlite is another microstructure that forms when carbon steel is slowly cooled, but with a slower cooling rate than fine pearlite. It also consists of alternating layers of ferrite and cementite, but the lamellae are larger and more widely spaced compared to fine pearlite. The coarse pearlite structure is observed in the region further away from the martensite zone.
The sequence of structures observed from the center towards either side of the weldment is therefore 3 (martensite), 1 (fine pearlite), 2 (coarse pearlite). This sequence is determined by the cooling rate experienced by the steel during the welding process. The center region cools rapidly, leading to the formation of martensite, while the adjacent regions cool at slower rates, resulting in the formation of pearlite microstructures. The difference in cooling rates is responsible for the variation in the size and spacing of the cementite lamellae, leading to the differences in microstructure observed.
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Two plain carbon steel specimens having 0·8% carbon content are welded. If weobserve the weldment under Metallurgical Microscope from centre towards eitherside, the following structures are observed at different zones:1. Fine Pearlite2. Coarse Pearlite3. MartensiteSelect the correct sequence using the codes given below:Codes:a)1, 2, 3b)1, 3, 2c)2, 1, 3d)3, 1, 2Correct answer is option 'D'. Can you explain this answer?
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Two plain carbon steel specimens having 0·8% carbon content are welded. If weobserve the weldment under Metallurgical Microscope from centre towards eitherside, the following structures are observed at different zones:1. Fine Pearlite2. Coarse Pearlite3. MartensiteSelect the correct sequence using the codes given below:Codes:a)1, 2, 3b)1, 3, 2c)2, 1, 3d)3, 1, 2Correct 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 Two plain carbon steel specimens having 0·8% carbon content are welded. If weobserve the weldment under Metallurgical Microscope from centre towards eitherside, the following structures are observed at different zones:1. Fine Pearlite2. Coarse Pearlite3. MartensiteSelect the correct sequence using the codes given below:Codes:a)1, 2, 3b)1, 3, 2c)2, 1, 3d)3, 1, 2Correct 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 Two plain carbon steel specimens having 0·8% carbon content are welded. If weobserve the weldment under Metallurgical Microscope from centre towards eitherside, the following structures are observed at different zones:1. Fine Pearlite2. Coarse Pearlite3. MartensiteSelect the correct sequence using the codes given below:Codes:a)1, 2, 3b)1, 3, 2c)2, 1, 3d)3, 1, 2Correct answer is option 'D'. Can you explain this answer?.
Two plain carbon steel specimens having 0·8% carbon content are welded. If weobserve the weldment under Metallurgical Microscope from centre towards eitherside, the following structures are observed at different zones:1. Fine Pearlite2. Coarse Pearlite3. MartensiteSelect the correct sequence using the codes given below:Codes:a)1, 2, 3b)1, 3, 2c)2, 1, 3d)3, 1, 2Correct 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 Two plain carbon steel specimens having 0·8% carbon content are welded. If weobserve the weldment under Metallurgical Microscope from centre towards eitherside, the following structures are observed at different zones:1. Fine Pearlite2. Coarse Pearlite3. MartensiteSelect the correct sequence using the codes given below:Codes:a)1, 2, 3b)1, 3, 2c)2, 1, 3d)3, 1, 2Correct 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 Two plain carbon steel specimens having 0·8% carbon content are welded. If weobserve the weldment under Metallurgical Microscope from centre towards eitherside, the following structures are observed at different zones:1. Fine Pearlite2. Coarse Pearlite3. MartensiteSelect the correct sequence using the codes given below:Codes:a)1, 2, 3b)1, 3, 2c)2, 1, 3d)3, 1, 2Correct answer is option 'D'. Can you explain this answer?.
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Two plain carbon steel specimens having 0·8% carbon content are welded. If weobserve the weldment under Metallurgical Microscope from centre towards eitherside, the following structures are observed at different zones:1. Fine Pearlite2. Coarse Pearlite3. MartensiteSelect the correct sequence using the codes given below:Codes:a)1, 2, 3b)1, 3, 2c)2, 1, 3d)3, 1, 2Correct answer is option 'D'. Can you explain this answer?, a detailed solution for Two plain carbon steel specimens having 0·8% carbon content are welded. If weobserve the weldment under Metallurgical Microscope from centre towards eitherside, the following structures are observed at different zones:1. Fine Pearlite2. Coarse Pearlite3. MartensiteSelect the correct sequence using the codes given below:Codes:a)1, 2, 3b)1, 3, 2c)2, 1, 3d)3, 1, 2Correct answer is option 'D'. Can you explain this answer? has been provided alongside types of Two plain carbon steel specimens having 0·8% carbon content are welded. If weobserve the weldment under Metallurgical Microscope from centre towards eitherside, the following structures are observed at different zones:1. Fine Pearlite2. Coarse Pearlite3. MartensiteSelect the correct sequence using the codes given below:Codes:a)1, 2, 3b)1, 3, 2c)2, 1, 3d)3, 1, 2Correct answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
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