a) The figure below shows three equilibrium structures that occur in an iron-carbon alloy, rank these from hardest to softest. b) The microstructure of an iron-carbon alloy consists of proeutectoid ferrite and pearlite. Relative mass to proeutectoid ferrite is 0.2 and pearlite is 0.80. How much carbon does this alloy contain?
a) The figure below shows three equilibrium structures that occur in an iron-carbon alloy, rank these from hardest to softest. b) The microstructure of an iron-carbon alloy consists of proeutectoid ferrite and pearlite. Relative mass to proeutectoid ferrite is 0.2 and pearlite is 0.80. How much carbon does this alloy contain?
Welding: Principles and Applications (MindTap Course List)
8th Edition
ISBN:9781305494695
Author:Larry Jeffus
Publisher:Larry Jeffus
Chapter26: Welding Metallurgy
Section: Chapter Questions
Problem 20R: What is known as the critical temperature of iron-carbon alloys?
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Question
a) The figure below shows three equilibrium structures that occur in an iron-carbon alloy, rank these from hardest to softest.
b) The microstructure of an iron-carbon alloy consists of proeutectoid ferrite and pearlite. Relative mass to proeutectoid ferrite is 0.2 and pearlite is 0.80. How much carbon does this alloy contain?
Transcribed Image Text:Proeutectoid
Fe3C
Pearlite
Eutectoid Fe3C
Fe3C
Fe3C-
Eutectoid a
a +
Fe3C
>Pearlite
Proeutectoid a
Transcribed Image Text:Temperature (°C)
Temperature
1600
1400
1200
1000
1538°C
600
800 a
8
400
0
(Fe)
912°C
1394°C
1493°C
Y, Austenite
0.022 Co
0.76
Ti U
0.022
a, Ferrite
1
0.76
V
5
C₁
7
2
2.14
Composition (at% C)
15
10
1147°C
a + FezC
y+ Fe3C
4
3
Composition (wt% C)
X
a + Fe3C
L
Composition (wt% C)
4.30
Y+Fe3C
727°C
20
Cementite (Fe3C).
5
6.70
6
25
2500
2000
1500
1000
6.70
Temperature (°F)
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