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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

From the phase diagram of the Fe-0.25wt%C alloy below, determine the phase fraction and elemental composition of the resulting phase immediately after solidification across the eutectoid line (725 C).

a.alpha_eutectoid = 96.6 wt% and cementite = 29.85 wt%

b.alpha_eutectoid = 96.6 wt% and cementite = 3.4 wt%

c.alpha_eutectoid = 1.05 wt% and cementite = 29.85 wt%

d.alpha_eutectoid = 29.85 wt% and cementite = 1.05 wt%

Composition (at% C)
10
15
20
25
1600
1538°C
1493°C
1400
2500
|1394°C
y+L
1200
1147°C
2.14
4.30
y, Austenite
2000
1000
91°C
y+ Fe3C
800
|1500
727°C
0.76
`0.022
600
`a, Ferrite
a + Fe3C
Cementite (FegC).
|1000
400
2
4
6.70
(Fe)
Composition (wt% C)
Temperature (°C)
3.
Temperature (°F)

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