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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Question

Using the isothermal transformation diagram for a 1.13 wt% C steel alloy, determine the final microstructure (in terms of the microconstituents present) of a small specimen that has undergone the following time-temperature treatments. In each case suppose that the sample begins at 920 ° C and that it has been held at this temperature for the time
sufficient to achieve a complete and homogeneous austenitic structure.

(a) Quickly cool to 250 ° C, hold for 103 s, then cool to room temperature.
(b) Quickly cool to 400 ° C, hold for 500 s, then cool to room temperature.
(c) Quick cool to 700 ° C, hold for 105 s, then cool to room temperature.
(d) Rapidly cool to 650 ° C, hold for 3 s and rapidly cool to 400 ° C, hold that temperature for 25 s and cool to room temperature.
(e) Quick cool to 650 ° C, hold for 7 s, then cool to room temperature.

900
1600
A
800
A+C
1400
700
1200
A +P
600
1000
A + B
500
800
400
A
600
300
50 %
200
M(start)
400
м/50%)
100
M(90%)
200
10
102
103
104
105
106
Time (s)
Temperature (°C)
B.
Temperature (°F)

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