11- For the iron-carbon phase diagram shown below:a.Write down the eutectic, eutectoid, and peritectic reactions and the temperature at which theyhappen.b.For an alloy that has 0.4% carbon what draw a schematic for the expected microstructure and theestimate the composition of each phase, and based on this determine % of each phase at 1500 °C.and 1200 °C.C₂Often, the properties of multiphase alloys may be approximated by the relationshipE (alloy) = EaVa+ EBVBwhere E represents a specific property (modulus of elasticity, hardness, etc.), and V is the volumefraction. The subscripts a and ß denote the existing phases or microconstituents. Use thisrelationship to determine the approximate Brinell hardness of a 99.6 wt% Fe-0.4 wt% C alloy.Assume Brinell hardnesses of 80 and 280 for ferrite and pearlite, respectively, and that volumefractions may be approximated by mass fractions.Temperature (°C)16001400120010008006004000(Fe)1538°C912°CaY8-1493°C1394°Cy, Austenite.0.760.022a, Ferrite5Y+L22.14Composition (at% C)15101147°Ca + Fe3CLEutectic4.30y+ Fe³C43Composition (wt% C)20727°C C=TeutectoidCementite (Fe3C)5256Page 5 of 825002000Temperature (°F)150010006.70

Given: The Iron-carbon phase diagram. Brief: Eutectic is a point where liquid directly changes…

Answered: 11- For the iron-carbon phase diagram…

11- For the iron-carbon phase diagram shown below: a. Write down the eutectic, eutectoid, and peritectic reactions and the temperature at which they happen.

Elements Of Electromagnetics

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Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Question

11- For the iron-carbon phase diagram shown below:
a.
Write down the eutectic, eutectoid, and peritectic reactions and the temperature at which they
happen.
b.
For an alloy that has 0.4% carbon what draw a schematic for the expected microstructure and the
estimate the composition of each phase, and based on this determine % of each phase at 1500 °C.
and 1200 °C.
C₂
Often, the properties of multiphase alloys may be approximated by the relationship
E (alloy) = EaVa+ EBVB
where E represents a specific property (modulus of elasticity, hardness, etc.), and V is the volume
fraction. The subscripts a and ß denote the existing phases or microconstituents. Use this
relationship to determine the approximate Brinell hardness of a 99.6 wt% Fe-0.4 wt% C alloy.
Assume Brinell hardnesses of 80 and 280 for ferrite and pearlite, respectively, and that volume
fractions may be approximated by mass fractions.
Temperature (°C)
1600
1400
1200
1000
800
600
400
0
(Fe)
1538°C
912°C
a
Y
8
-1493°C
1394°C
y, Austenite.
0.76
0.022
a, Ferrite
5
Y+L
2
2.14
Composition (at% C)
15
10
1147°C
a + Fe3C
L
Eutectic
4.30
y+ Fe³C
4
3
Composition (wt% C)
20
727°C C=Teutectoid
Cementite (Fe3C)
5
25
6
Page 5 of 8
2500
2000
Temperature (°F)
1500
1000
6.70

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