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. (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.

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 scenario using the TTT diagram 

Temperature (°C)
800
700
600
500
400
300
200
100
0
10-1
A
M (start)
M (50%)
M (90%)
1
1
10
Eutectoid temperature
M + A
I
10²
Time (s)
50%
10³
10⁰
1400
1200
1000
800
600
400
200
105
Temperature (°F)
Transcribed Image Text:Temperature (°C) 800 700 600 500 400 300 200 100 0 10-1 A M (start) M (50%) M (90%) 1 1 10 Eutectoid temperature M + A I 10² Time (s) 50% 10³ 10⁰ 1400 1200 1000 800 600 400 200 105 Temperature (°F)
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.
(iv) Cool rapidly to 400°C (750°F), hold for 200 s, then quench to room temperature.
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.
Transcribed Image Text: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. (iv) Cool rapidly to 400°C (750°F), hold for 200 s, then quench to room temperature. 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.
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