1. Using the isothermal transformation diagram below, describe the microstructure present in a eutectoid carbon steel, after each of the following heat treatments. From 800 C: (a) Cool to 450 C and hold for 10 s, cool to 375 C hold for 100 s, quench to 25 C. (b) Cool to 650 C and hold for 300 s, and quench to 25 C. (c) Cool to 720 C and hold for 100 s, quench to 400 C and hold for 200s, and quench to 25 C.

Elements Of Electromagnetics
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1. 1. Using the isothermal transformation diagram below, describe the microstructure
present in a eutectoid carbon steel, after each of the following heat treatments. From 800
C:
(a) Cool to 450 C and hold for 10 s, cool to 375 C hold for 100 s, quench to 25 C.
(b) Cool to 650 C and hold for 300 s, and quench to 25 C.
(c) Cool to 720 C and hold for 100 s, quench to 400 C and hold for 200 s, and quench to
25 C.
Temperature (°C)
800
700
600
500
400
300
200
100
0
10-1
A
A
A
M(start)
M(50%)
M(90%)
1
10
M+A
Eutectoid temperature
P
10²
Time (s)
B
50%
10³ 104
1400
1200
1000
800
600
400
200
105
Temperature (°F)
Transcribed Image Text:1. 1. Using the isothermal transformation diagram below, describe the microstructure present in a eutectoid carbon steel, after each of the following heat treatments. From 800 C: (a) Cool to 450 C and hold for 10 s, cool to 375 C hold for 100 s, quench to 25 C. (b) Cool to 650 C and hold for 300 s, and quench to 25 C. (c) Cool to 720 C and hold for 100 s, quench to 400 C and hold for 200 s, and quench to 25 C. Temperature (°C) 800 700 600 500 400 300 200 100 0 10-1 A A A M(start) M(50%) M(90%) 1 10 M+A Eutectoid temperature P 10² Time (s) B 50% 10³ 104 1400 1200 1000 800 600 400 200 105 Temperature (°F)
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