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4. Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, specify the nature of the final microstructure of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen beings at 760°C and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (1) Cool rapidly to 700°C, hold for 104 sec, then quench to room temperature (2) Cool rapidly to 400°C, hold for 20 sec, then quench to room temperature (3) Rapidly cool to 575°C, hold for 20 sec, rapidly cool to 350°C, hold for 100 sec, then quench to room temperature. Temperature (°C) 800 700 600 500 400 300 200 100 10-1 A N A A 1 Eutectoid temperature 10 P B 50% 1400 -1200 1000 -800 -600 10² 10³ 104 105 Time (s) Adapted from H. Boyer (Editor). Atlas of Isothermal Transformation and Cooling Transformation Diagrams, American Society for Metals, 1977, p. 28. 400 Temperature (°F)

4. Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, specify the nature of the final microstructure of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen beings at 760°C and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (1) Cool rapidly to 700°C, hold for 104 sec, then quench to room temperature (2) Cool rapidly to 400°C, hold for 20 sec, then quench to room temperature (3) Rapidly cool to 575°C, hold for 20 sec, rapidly cool to 350°C, hold for 100 sec, then quench to room temperature. Temperature (°C) 800 700 600 500 400 300 200 100 10-1 A N A A 1 Eutectoid temperature 10 P B 50% 1400 -1200 1000 -800 -600 10² 10³ 104 105 Time (s) Adapted from H. Boyer (Editor). Atlas of Isothermal Transformation and Cooling Transformation Diagrams, American Society for Metals, 1977, p. 28. 400 Temperature (°F)

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
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4. Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, specify the nature of the final microstructure of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen beings at 760°C and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (1) Cool rapidly to 700°C, hold for 104 sec, then quench to room temperature (2) Cool rapidly to 400°C, hold for 20 sec, then quench to room temperature (3) Rapidly cool to 575°C, hold for 20 sec, rapidly cool to 350°C, hold for 100 sec, then quench to room temperature. Temperature (°C) 800 700 600 500 400 300 200 100 10-1 A N A A 11 P Eutectoid temperature -- 50% 1400 1200 1000 -800 600 400 10³ 104 105 1 10 10² Time (s) Adapted from H. Boyer (Editor). Atlas of Isothermal Transformation and Cooling Transformation Diagrams, American Society for Metals, 1977, p. 28. Temperature (°F)
Transcribed Image Text:4. Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, specify the nature of the final microstructure of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen beings at 760°C and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (1) Cool rapidly to 700°C, hold for 104 sec, then quench to room temperature (2) Cool rapidly to 400°C, hold for 20 sec, then quench to room temperature (3) Rapidly cool to 575°C, hold for 20 sec, rapidly cool to 350°C, hold for 100 sec, then quench to room temperature. Temperature (°C) 800 700 600 500 400 300 200 100 10-1 A N A A 11 P Eutectoid temperature -- 50% 1400 1200 1000 -800 600 400 10³ 104 105 1 10 10² Time (s) Adapted from H. Boyer (Editor). Atlas of Isothermal Transformation and Cooling Transformation Diagrams, American Society for Metals, 1977, p. 28. Temperature (°F)
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