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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
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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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 800 600 400 200 105 Temperature (°F)
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 800 600 400 200 105 Temperature (°F)
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.
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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