Answered: 6.1) At the composition of 0.77% by…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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6.1) At the composition of 0.77% by weight C, identify the phase(s) present
at 950 degrees C
6.2) When the specimen is at 950 degrees C, what is the maximum C composition at which a single phase Austenite is stable?
6.3) If we slowly cool a Fe-C alloy with 0.77% by weight C, austenitized at
950 degrees C, to just below the eutectoid temperature of 727 degrees C, give the weight percentage and composition of the phases present based on the phase diagram given above
6.4) If we cool very quickly a Fe-C alloy with 0.77% by weight C,
austenitized at 950 degrees C, to room temperature, give the weight percentage and composition of the phase(s) present

1600
Peritectic point
1495°
1538°
1500,
0.53%
0.17%
0.09%
Liquid
1400
1396°
1300
Eutectic point
1200
1148°
y Phase
(austenite)
1100
2.11%
1000
Y + Fe,C (austentite + cementite)
911.5%
900
800
a-Y
0.22%.
727°
700
Eutectoid point
600
500
400
a + Fe,C (ferrite + cementite)
300
200
Cementite 6.7%
100
0.77%
4.32
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
Weight percent carbon
Temperature °C
a phase (ferrite)

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