Continuous Cooling Transformation (CCT) Diagram for Steel 1. If a sample of austenite is cooled from 760°C to room temperature at a rate of 85°C/s (midway between the red and blue dotted lines), estimate the following values: a) How much time would it take for pearlite to begin forming and at what temperature would this occur? b) How much time would it take for martensite to begin forming and at what temperature would this occur? Temperature (°C) 800 Eutectoid temperature 1400 700 Pearlite 600 500 400 300 Critical cooling rate 200 140°C/s Austenite 35°C/s 1200 1000 800 600 M (start) 400 100 Martensite Martensite I + ++ Pearlite 200 Pearlite 0 10-1 1 10 102 103 104 105 Time (s) Temperature (°F)

Elements Of Electromagnetics
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Continuous Cooling Transformation (CCT) Diagram for Steel
1. If a sample of austenite is cooled from 760°C to room temperature at a rate of 85°C/s (midway
between the red and blue dotted lines), estimate the following values:
a) How much time would it take for pearlite to begin forming and at what temperature would this
occur?
b) How much time would it take for martensite to begin forming and at what temperature would
this occur?
Temperature (°C)
800
Eutectoid temperature
1400
700
Pearlite
600
500
400
300
Critical
cooling
rate
200
140°C/s
Austenite
35°C/s
1200
1000
800
600
M (start)
400
100
Martensite
Martensite I
+ ++
Pearlite
200
Pearlite
0
10-1
1
10
102
103
104
105
Time (s)
Temperature (°F)
Transcribed Image Text:Continuous Cooling Transformation (CCT) Diagram for Steel 1. If a sample of austenite is cooled from 760°C to room temperature at a rate of 85°C/s (midway between the red and blue dotted lines), estimate the following values: a) How much time would it take for pearlite to begin forming and at what temperature would this occur? b) How much time would it take for martensite to begin forming and at what temperature would this occur? Temperature (°C) 800 Eutectoid temperature 1400 700 Pearlite 600 500 400 300 Critical cooling rate 200 140°C/s Austenite 35°C/s 1200 1000 800 600 M (start) 400 100 Martensite Martensite I + ++ Pearlite 200 Pearlite 0 10-1 1 10 102 103 104 105 Time (s) Temperature (°F)
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