(b) Fig. Q2(b) shows the isothermal transformation diagram for hypo-eutectoid steel. Sketch and label on this diagram the time temperature paths to produce the microstructure that consisting of proeutectoid ferrite, pearlite and martensite. Assume that the steel has been heated above 800° C and held at this temperature long enough to achieve a homogeneous austenitic structure.
(b) Fig. Q2(b) shows the isothermal transformation diagram for hypo-eutectoid steel. Sketch and label on this diagram the time temperature paths to produce the microstructure that consisting of proeutectoid ferrite, pearlite and martensite. Assume that the steel has been heated above 800° C and held at this temperature long enough to achieve a homogeneous austenitic structure.
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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Transcribed Image Text:(b) Fig. Q2(b) shows the isothermal transformation diagram for hypo-eutectoid steel.
Sketch and label on this diagram the time temperature paths to produce the
microstructure that consisting of proeutectoid ferrite, pearlite and martensite. Assume
that the steel has been heated above 800° C and held at this temperature long enough
to achieve a homogeneous austenitic structure.
MATR 2381 Materials Science and Engine
900
1600
800
A+F
1400
700
1200
A+P
600
1000 C
500
A+B
800
50%
400
M(start)
M(50%)
600
300
M(90%)
200
400
100
200
0.1
10
102
103
104
105
Time (s)
Fig. Q2(b): TTT diagram for hypoeutectoid steel
Temperature ("C)
Temperature ("
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