Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, specify the final microstructure and approximate amount of each. Assume a small specimen has been held long enough to have achieved a complete and homogeneous austenitic structure prior to treatment. Sample (1): Quickly cool specimen from 800°C to 575°C, hold for 10 s, then quench to room temperature. Sample (2): Quickly cool specimen from 800°C to 500°C, hold for 100 s, then quench to room temperature.
Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, specify the final microstructure and approximate amount of each. Assume a small specimen has been held long enough to have achieved a complete and homogeneous austenitic structure prior to treatment. Sample (1): Quickly cool specimen from 800°C to 575°C, hold for 10 s, then quench to room temperature. Sample (2): Quickly cool specimen from 800°C to 500°C, hold for 100 s, then quench to room temperature.
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
Related questions
Question
Transcribed Image Text:800
A
Eutectoid temperature
H 1400
700
A
H 1200
600
1000
500
B
800
400
A
300
600
M(start)
200
M + A
50%
400
M(50%)
M(90%)
100
200
10-1
1
10
102
103
104
105
Time (s)
Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, specify the final microstructure and
approximate amount of each. Assume a small specimen has been held long enough to have achieved a complete and homogeneous
austenitic structure prior to treatment.
Sample (1): Quickly cool specimen from 800°C to 575°C, hold for 10 s, then quench to room temperature.
Sample (2): Quickly cool specimen from 800°C to 500°C, hold for 100 s, then quench to room temperature.
O after treatment, sample 1 is 50% pearlite, 50% austenite
O after treatment, sample 2 is bauxite
O after treatment, sample 1 is 25% pearlite
O after treatment, sample 2 is bainite
O after treatment, sample 2 is austenite
O None of the answers is correct.
O after treatment, sample 2 is coarse pearlite
O after treatment, sample 1 is tempered martensite
O after treatment, sample 1 is pearlite
O after treatment, sample 2 is spherodite
O after treatment, sample 1 is martensite
O after treatment, sample 1 is bainite
O after treatment, sample 2 is tempered martensite
O after treatment, sample 2 is kryptonite
Temperature (°C)
Temperature (°F)
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