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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
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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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

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
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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