O Bainite and martensite are non-equilibrium microstructures and this is an equilibrium phase diagram.

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
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[Chapter 10] In the figure below, we see the transition from austenite (point a) through the
eutectoid point to pearlite (point b). However, other microstructures (bainite, martensite) can also
be formed from austenite through the same eutectoid point. How is this possible, given that they
are not on the diagram below?
1100
1000
y + FezC
900
800
a
a + y
727°C
700
600
FegC
500
a + FezC
400
1.0
2.0
Composition (wt % C)
This diagram does not show transformations below 400°c.
Austenite must transform to pearlite before it can form bainite or
martensite.
O Bainite and martensite are non-equilibrium microstructures and this is an
equilibrium phase diagram.
This is an outdated diagram.
Temperature (°C)
Transcribed Image Text:[Chapter 10] In the figure below, we see the transition from austenite (point a) through the eutectoid point to pearlite (point b). However, other microstructures (bainite, martensite) can also be formed from austenite through the same eutectoid point. How is this possible, given that they are not on the diagram below? 1100 1000 y + FezC 900 800 a a + y 727°C 700 600 FegC 500 a + FezC 400 1.0 2.0 Composition (wt % C) This diagram does not show transformations below 400°c. Austenite must transform to pearlite before it can form bainite or martensite. O Bainite and martensite are non-equilibrium microstructures and this is an equilibrium phase diagram. This is an outdated diagram. Temperature (°C)
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