4. For an iron-carbon alloy of composition 5 wt% C – 95 wt% Fe (as shown in figure) i. Draw schematic sketches of the microstructure that would be observed for conditions of very slow cooling at the following temperatures: 1180°C, 1145°C, and 700°C. ii. Label the phases and indicate their compositions. iii. Analyse why upon solidification, an alloy of eutectoid composition forms a microstructure consisting of alternating layers of two solid phases?
4. For an iron-carbon alloy of composition 5 wt% C – 95 wt% Fe (as shown in figure) i. Draw schematic sketches of the microstructure that would be observed for conditions of very slow cooling at the following temperatures: 1180°C, 1145°C, and 700°C. ii. Label the phases and indicate their compositions. iii. Analyse why upon solidification, an alloy of eutectoid composition forms a microstructure consisting of alternating layers of two solid phases?
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:4. For an iron-carbon alloy of composition 5 wt% C – 95 wt% Fe (as shown in figure)
i. Draw schematic sketches of the microstructure that would be observed for
conditions of very slow cooling at the following temperatures: 1180°C,
1145°C, and 700°C.
ii. Label the phases and indicate their compositions.
iii. Analyse why upon solidification, an alloy of eutectoid composition forms a
microstructure consisting of alternating layers of two solid phases?
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
912°C
Y+ FegC
800
1500
+
727°C
0.76
0.022
600
a, Ferrite
a+ FezC
Cementite (FegC)
1000
400
1
3
4
6
6.70
(Fe)
Composition (wt% C)
Temperature (°C)
Temperature (°F)
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