Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition (Figure below), specify the nature of the final microstructure (in terms of microconstituents present and approximate percentages of each) of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen begins at 760°C (1400°F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (a) Cool rapidly to 350°C (660°F), hold for 10³ s, then quench to room temperature.
Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition (Figure below), specify the nature of the final microstructure (in terms of microconstituents present and approximate percentages of each) of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen begins at 760°C (1400°F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (a) Cool rapidly to 350°C (660°F), hold for 10³ s, then quench to room temperature.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Question
Transcribed Image Text:Temperature (°C)
800
700
600
500
400
300
200
100
0
10-1
A
A
A
M(start)
M(50%)
M(90%)
1
x-A
10
M + A
Eutectoid temperature
P
10²
Time (s)
B
50%
103
104
1
1400
1200
1000
800
600
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105
Temperature (°F)
Transcribed Image Text:1.
Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition (Figure below),
specify the nature of the final microstructure (in terms of microconstituents present and approximate
percentages of each) of a small specimen that has been subjected to the following time-temperature treatments.
In each case assume that the specimen begins at 760°C (1400°F) and that it has been held at this temperature
long enough to have achieved a complete and homogeneous austenitic structure.
(a) Cool rapidly to 350°C (660°F), hold for 10³ s, then quench to room temperature.
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