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.
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.
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
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Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.22P: 1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas...
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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)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6263cf7b-362e-4a0a-b76a-ee71d7490ef2%2F88848958-901b-4aef-b4b6-7f2536d7183d%2Fu8el3a4_processed.jpeg&w=3840&q=75)
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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6263cf7b-362e-4a0a-b76a-ee71d7490ef2%2F88848958-901b-4aef-b4b6-7f2536d7183d%2F2rawhrf_processed.jpeg&w=3840&q=75)
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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