Answered: Using the isothermal transformation…

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

. Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, specify the nature of the final composition in terms of microconstituents present and approximate percentages:

a) Rapidly cool to 350 ^oC, hold for 10⁴ s, and quench to room temperature.
b) Rapidly cool to 250 ^oC, hold for 100 s, and quench to room temperature.
c) Rapidly cool to 650 ^oC, hold for 20 s, rapidly cool to 400 ^oC, hold for 10³ s, and quench to room temperature.

3. Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, specify
the nature of the final composition in terms of microconstituents present and approximate percentages:
a) Rapidly cool to 350C, hold for 104 s, and quench to room temperature.
b) Rapidly cool to 250 C, hold for 100 s, and quench to room temperature.
c) Rapidly cool to 650 C, hold for 20 s, rapidly cool to 400C, hold for 103 s, and quench to room
temperature.
800
1400
Eutectoid temperature
700
(c)
1200
600
A
1000
500
A+B
A
(c)
800
400
(a)
300
600
(b)
M(start)
200
400
M(50%)
M(90%)
100
200
(b)
(c)
10-1
102
10
104
10
105
Time (s)
Temperature ("C)
Temperature ("F)

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