An Fe-C alloy with the eutectoid composition has been homogenized at 760°C. Use the time-temperature-transformation diagram below to determine what microstructure would be developed by rapidly cooling to 600°C and holding for 100 seconds. followed by rapid cooling to 400°C and holding for 1000 seconds. followed by quenching to room temperature. Temperature (C) BOO 700 600 500 400 300 200 ➤ Mstart M50% Eutectoid 1 temperature 50%

An Fe-C alloy with the eutectoid composition has been homogenized at 760°C. Use the time-temperature-transformation diagram below to determine what microstructure would be developed by rapidly cooling to 600°C and holding for 100 seconds. followed by rapid cooling to 400°C and holding for 1000 seconds. followed by quenching to room temperature. Temperature (C) BOO 700 600 500 400 300 200 ➤ Mstart M50% Eutectoid 1 temperature 50%

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

An Fe-C alloy with the eutectoid composition has been
homogenized at 760°C. Use the time-temperature-transformation
diagram below to determine what microstructure would be
developed by rapidly cooling to 600°C and holding for 100 seconds,
followed by rapid cooling to 400°C and holding for 1000 seconds.
followed by quenching to room temperature.
Temperature ("C)
800
700
600
500
400
300
200
100
10
Mstart
M50%)
M90%
1
100% martensite
100 % bainite
10
MV
200 parte
50% pearlite 50% bainito
30²
Time to
100% tempered martensite
Eutectoid temperature
50%
10²
10

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