Answered: A hypo-eutectoid steel with composition…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A hypo-eutectoid steel with composition of 0.5% carbon is heated to 1000°. Using the a iron-carbon phase diagram (also found in the course book, or here https://commons.wikimedia.org/wiki/File:Iron_carbon_phase_diagram.svg (Links to an external site.) (Links to an external site.)) answer the following questions.

(a) What phase or phases will be present at 950°C?

(b) If temperature is lowered from 950°C, at which temperature (estimate) α phase (Ferrite) will appear?

(c) Use the lever rule to estimate how much (wt%) ferrite and how much austenite will exist just above 727 °C?

(d) What happens to the austenite if the temperature is lowered below 727 °C?

(e) Schematically sketch and label the resulting microstructure.

Composition (at% C)
10
15
20
25
1600
1538°C
1493°C
L
1400
2500
1394°C
Y + L
1200
1147°C
2.14
4.30
Y, Austenite
2000
1000
912°C
y + Fe3C
800
1500
+
727°C
0.76
0.022
600
`a, Ferrite
a + Fe3C
Cementite (Fe3C)
1000
400
1
2
3
4
6.
6.70
(Fe)
Composition (wt% C)
Adapted from Binary Alloy Phase Diagrams, Vol. 1, 2nd edition, T. B. Massalski (Editor-in-Chief), 1990. Reprinted
by permission of ASM International, Materials Park, OH.
Temperature (°C)
Temperature (°F)

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