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.

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

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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Question

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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