Temperature TTT diagram (for isothermal and constant cooling rate transformations) C=0.29% Mn=0.81% Ni=0.57% Cr=0.64% Mo-0.22% steel ºC stable austenite 800. metastable austenite 600 A3 austenite > ferrite.. A₁ austenite pearlite transformations austenitebainite begin 400 Ms transformations austenite martensite end Mf 200. 0 0.1 Constant cooling rate coolings Cooling for isothermal transformation Exponentially retarded cooling just to remember how to interpret the coolings in the figure the first 100 °C in 0.34 s, the last 100 °C in 7736 s 10 102 103 103 104 10 105 106 s m Time h Lines for isothermal transformations W Lines for constant cooling rate transformations
Temperature TTT diagram (for isothermal and constant cooling rate transformations) C=0.29% Mn=0.81% Ni=0.57% Cr=0.64% Mo-0.22% steel ºC stable austenite 800. metastable austenite 600 A3 austenite > ferrite.. A₁ austenite pearlite transformations austenitebainite begin 400 Ms transformations austenite martensite end Mf 200. 0 0.1 Constant cooling rate coolings Cooling for isothermal transformation Exponentially retarded cooling just to remember how to interpret the coolings in the figure the first 100 °C in 0.34 s, the last 100 °C in 7736 s 10 102 103 103 104 10 105 106 s m Time h Lines for isothermal transformations W Lines for constant cooling rate transformations
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
Related questions
Question
1. Describe this diagram in terms of what information it gives you and how you can use this to determine a heat treatment for steel (10).
2. Describe a simple continuous cooling heat treatment to
a) Bainite to pearlite
3. Describe the difference between the microstructure of bainite and tempered pearlite
Transcribed Image Text:Temperature
TTT diagram
(for isothermal and constant cooling rate transformations)
C=0.29% Mn=0.81% Ni=0.57% Cr=0.64% Mo-0.22% steel
ºC
stable austenite
800.
metastable
austenite
600
A3
austenite > ferrite.. A₁
austenite pearlite
transformations
austenitebainite
begin
400
Ms
transformations
austenite martensite
end
Mf
200.
0
0.1
Constant cooling rate coolings
Cooling for isothermal transformation
Exponentially retarded cooling
just to remember how to interpret the coolings in the figure
the first 100 °C in 0.34 s, the last 100 °C in 7736 s
10
102
103
103 104 10
105 106 s
m Time h
Lines for isothermal transformations
W
Lines for constant cooling rate transformations
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