Answered: Using the isothermal transformation…

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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Using the isothermal transformation diagram for a 0.45 wt% C steel alloy (Animated Figure 10.40), determine the approximate percentages of the microconstituents that form the final microstructure of a small specimen that has been subjected to the following time– temperature treatments. In each case assume that the specimen begins at 845°C (1550°F), and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure.

Rapidly cool to 700°C (1290°F), hold at this temperature for 10° s, then quench to room temperature.
martensite
i
ferrite
bainite
spheroidite
austenite
%

Time = 1 · 10E-1 s
Temperature = 0 °C
Temperature = 32 °F
%3D
900
1600
800
A + F
A
1400
700
1200
`A + P
600
1000
500
FA+ B
800
50%
400
M (start)
M (50%)
600
300
M (90%)
200
400
100
200
01
102
Time (s)
1
10
103
104
105
Temperature (°C)
T
Temperature (°F)

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