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?

Precision Machining Technology (MindTap Course List)
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Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes
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Chapter2: Measurement, Materials, And Safety
Section2.6: Metal Composition And Classification
Problem 14RQ: What is (are) the major alloying element(s) of 6061 aluminum?
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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?

Proeutectoid
Fe3C
Pearlite
Eutectoid Fe3C
Fe3C
Fe3C-
Eutectoid a
a +
Fe3C
>Pearlite
Proeutectoid a
Transcribed Image Text:Proeutectoid Fe3C Pearlite Eutectoid Fe3C Fe3C Fe3C- Eutectoid a a + Fe3C >Pearlite Proeutectoid a
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)
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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