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Question 4: Using the following TTT diagram for an iron-carbon alloy of eutectoid composition, specify the nature of the final microstructure (in terms of microconstituents present and approximate percentages of each) of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen begins at 760°C (1400°F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (1) Cool rapidly to 700°C (1290°F), hold for 10 s, then quench to room temperature (ii) Reheat the specimen in part (i) to 700°C (1290°F) for 20 h.

Question 4: Using the following TTT diagram for an iron-carbon alloy of eutectoid composition, specify the nature of the final microstructure (in terms of microconstituents present and approximate percentages of each) of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen begins at 760°C (1400°F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (1) Cool rapidly to 700°C (1290°F), hold for 10 s, then quench to room temperature (ii) Reheat the specimen in part (i) to 700°C (1290°F) for 20 h.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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please draw each question on the TTT diagram

Question 4: Using the following TTT diagram for an iron-carbon alloy of eutectoid composition, specify the nature of the final microstructure (in terms of microconstituents present and approximate percentages of each) of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen begins at 760°C (1400°F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (1) Cool rapidly to 700°C (1290°F), hold for 104 s, then quench to room temperature (ii) Reheat the specimen in part (1) to 700°C (1290°F) for 20 h. (iii) Cool rapidly to 400°C (750°F), hold for 20 s, then quench to room temperature (iv) Cool rapidly to 400°C (750°F), hold for 200 s, then quench to room temperature. (v) Rapidly cool to 575°C (1065°F), hold for 20 s, rapidly cool to 350°C (660°F), hold for 100 s, then quench to room temperature. (vi) Rapidly cool to 250°C (480°F), hold for 100 s, then quench to room temperature in water. Reheat to 315°C (600°F) for 1 h and slowly cool to room temperature. Temperature (°C) 800 700 600 500 400 300 200 100 0 10-1 A M (start) M (50%) M (90%) 1 10 Eutectoid temperature M + A 10² Time (s) 50% 10⁰ 10⁰ T 1400 1200 1000 800 600 400 200 105 Temperature (°F)
Transcribed Image Text:Question 4: Using the following TTT diagram for an iron-carbon alloy of eutectoid composition, specify the nature of the final microstructure (in terms of microconstituents present and approximate percentages of each) of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen begins at 760°C (1400°F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (1) Cool rapidly to 700°C (1290°F), hold for 104 s, then quench to room temperature (ii) Reheat the specimen in part (1) to 700°C (1290°F) for 20 h. (iii) Cool rapidly to 400°C (750°F), hold for 20 s, then quench to room temperature (iv) Cool rapidly to 400°C (750°F), hold for 200 s, then quench to room temperature. (v) Rapidly cool to 575°C (1065°F), hold for 20 s, rapidly cool to 350°C (660°F), hold for 100 s, then quench to room temperature. (vi) Rapidly cool to 250°C (480°F), hold for 100 s, then quench to room temperature in water. Reheat to 315°C (600°F) for 1 h and slowly cool to room temperature. Temperature (°C) 800 700 600 500 400 300 200 100 0 10-1 A M (start) M (50%) M (90%) 1 10 Eutectoid temperature M + A 10² Time (s) 50% 10⁰ 10⁰ T 1400 1200 1000 800 600 400 200 105 Temperature (°F)
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