A steel, possessing an eutectoid composition, undergoes a gradual cooling process from 800°C to 600°C. Outline the transformation, equilibrium microstructure, and provide approximate component proportions. Describe the resultant non-equilibrium microstructure in two scenarios: a) the steel is rapidly cooled from 800°C to 600°C within 1 s, and then held at such temperature; b) the steel is rapidly cooled from 800°C to 600°C within 1 s, maintained at this temperature for 5 s, and subsequently quenched to room temperature. Use the provided diagrams. Temperature (°C) 1600 1538°C 1493°C 1400 L 1394°C Y+L 1200- 1147°C 2.14 Y. Austenite 4.30 1000 912°C Y+ FeC 800 a 600 400 0 (Fe) 0.76 0.022 a, Ferrite 2 a + Fe3C 3 Composition (wt% C) 727°C Cementite (Fe3C) 4 5 6 6.7 800 700 600 500- 400 A 300 -4- dondo chale M Eutectoid temperature 1400 Gtg 01 1200 Jong 2.00 g 1000 800 600 Mistart) 200 50% M+A 400 M(50%) M(90%) 100 200 10-1 10102 Time (s) 103 104 105
A steel, possessing an eutectoid composition, undergoes a gradual cooling process from 800°C to 600°C. Outline the transformation, equilibrium microstructure, and provide approximate component proportions. Describe the resultant non-equilibrium microstructure in two scenarios: a) the steel is rapidly cooled from 800°C to 600°C within 1 s, and then held at such temperature; b) the steel is rapidly cooled from 800°C to 600°C within 1 s, maintained at this temperature for 5 s, and subsequently quenched to room temperature. Use the provided diagrams. Temperature (°C) 1600 1538°C 1493°C 1400 L 1394°C Y+L 1200- 1147°C 2.14 Y. Austenite 4.30 1000 912°C Y+ FeC 800 a 600 400 0 (Fe) 0.76 0.022 a, Ferrite 2 a + Fe3C 3 Composition (wt% C) 727°C Cementite (Fe3C) 4 5 6 6.7 800 700 600 500- 400 A 300 -4- dondo chale M Eutectoid temperature 1400 Gtg 01 1200 Jong 2.00 g 1000 800 600 Mistart) 200 50% M+A 400 M(50%) M(90%) 100 200 10-1 10102 Time (s) 103 104 105
Materials Science And Engineering Properties
1st Edition
ISBN:9781111988609
Author:Charles Gilmore
Publisher:Charles Gilmore
Chapter6: Introduction To Mechanical Properties
Section: Chapter Questions
Problem 6.8P
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Transcribed Image Text:A steel, possessing an eutectoid composition, undergoes a gradual cooling process from 800°C to
600°C. Outline the transformation, equilibrium microstructure, and provide approximate component
proportions.
Describe the resultant non-equilibrium microstructure in two scenarios:
a) the steel is rapidly cooled from 800°C to 600°C within 1 s, and then held at such temperature;
b) the steel is rapidly cooled from 800°C to 600°C within 1 s, maintained at this temperature for
5 s, and subsequently quenched to room temperature.
Use the provided diagrams.
Temperature (°C)
1600
1538°C
1493°C
1400
L
1394°C
Y+L
1200-
1147°C
2.14
Y. Austenite
4.30
1000
912°C
Y+ FeC
800
a
600
400
0
(Fe)
0.76
0.022
a, Ferrite
2
a + Fe3C
3
Composition (wt% C)
727°C
Cementite (Fe3C)
4
5
6
6.7
Transcribed Image Text:800
700
600
500-
400
A
300
-4-
dondo
chale M
Eutectoid temperature
1400
Gtg 01
1200
Jong 2.00 g
1000
800
600
Mistart)
200
50%
M+A
400
M(50%)
M(90%)
100
200
10-1
10102
Time (s)
103
104
105
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