mseasuslides: muddiest point: phase diagrams v fe-fe3c microstructures s…
DESCRIPTION
This slide set corresponds to the MaterialsConcepts YouTube video "Muddiest Point: Phase Diagrams V Fe-Fe3C Microstructures". Here's the link: http://www.youtube.com/watch?v=wZgpTHZSuNY To study the vocab used in this video, visit this site: http://quizlet.com/20699514/54-steel-heat-treatment-and-microstructures-flash-cards/ This work was supported by NSF Grants #0836041 and #1226325.TRANSCRIPT
Muddiest Points Phase Diagrams V: Fe-‐Fe3C Phase Diagram Microstructures
Muddiest Points: • I don't know the difference between pearlite vs. ferrite vs. austenite vs. cemenDte.
• What is the difference between microstructure and phase?
• What does terminology like "eutectoid" and "proeutectoid" mean when talking about microstructure?
• How do I draw microstructures given fracDons, temperature and composiDon?
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For 1076 steel at 728°C
Phase CalculaDons
6.67 1 0 Co
ComposiDon-‐ Wt% C
1000
800
600
400
Tempe
rature
α
α +Fe3C
Fe3C +γ
0.76%
Fe3C
X 727°C
Given 1) 728°C 2) 1076 Steel
Microstructure:
γ
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For 1076 steel at 726°C
Phase CalculaDons
6.67 1 0 Co ComposiDon-‐ Wt% C
1000
800
600
400
Tempe
rature
γ
α
α +Fe3C
Fe3C +γ
Cα CFe3C
U T
0.76%
Fe3C
X0.022%
727°C
0.022%
Given 1) 726°C 2) 1076 Steel
Microstructure:
α
Fe3C
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Eutectic Phase Diagram Terminology
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For 1030 steel at 1000°C
Single Phase Region Microstructure
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For 1030 steel at 850°C
Phase CalculaDons
6.67 1 0 Co ComposiDon-‐ Wt% C
1000
800
600
400
Tempe
rature 850
α
α +Fe3C
Fe3C +γ
Cα Cγ
Q P
0.3%
X
Fe3C
727°C
0.45% 0.01%
Given 1) 850°C 2) 1030 Steel
Microstructure:
γ
α
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For 1030 steel at 728°C
Phase CalculaDons
6.67 1 0 Co ComposiDon-‐ Wt% C
1000
800
600
400
Tempe
rature
α
α +Fe3C
Fe3C +γ
Cα Cγ
R S
0.3%
X
0.022 %
0.76%
Fe3C
727°C
Given 1) 728°C 2) 1030 Steel
Microstructure:
α
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For 1030 steel at 726°C
Phase CalculaDons
6.67 1 0 Co ComposiDon-‐ Wt% C
1000
800
600
400
Tempe
rature
γ
α
α +Fe3C
Fe3C +γ
Cα CFe3C
U T
0.3%
Fe3C
X0.022% 727°C
0.022 %
Given 1) 726°C 2) 1030 Steel
Microstructure:
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For 10100 steel at 728°C
Phase CalculaDons
6.67 1 0 Co
ComposiDon-‐ Wt% C
1000
800
600
400
Tempe
rature
γ
α
α +Fe3C
Fe3C +γ
CFe3C
V W
1%
Fe3C
X
0.022%
727°C
Cγ 0.76%
Given 1) 78°C 2) 10100 Steel
Microstructure:
Fe3C
γ
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For 10100 steel at 726°C
Phase CalculaDons
6.67 1 0 Co 1% ComposiDon-‐ Wt% C
1000
800
600
400
Tempe
rature
γ
α
α +Fe3C
Fe3C +γ
Cα CFe3C
Y Z
Fe3C
X0.022%
727°C
0.022%
Given 1) 726°C 2) 10100 Steel
Microstructure:
Fe3C
Summary of Eutectoid Microstructures
γ
γ α α
γ
α
α
α
α
α
α
α
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Fe3C
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X
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X X
X X
ComposiDon-‐ Wt% C
X X
α
α
Fe3C
Fe3C
γ
γ γ
α
Muddiest Points Phase Diagrams V: Fe-‐Fe3C Phase Diagram Microstructures
Muddiest Points: • I don't know the difference between pearlite vs. ferrite vs. austenite vs. cemenDte.
• What is the difference between microstructure and phase?
• What does terminology like "eutectoid" and "proeutectoid" mean when talking about microstructure?
• How do I draw microstructures given fracDons, temperature and composiDon?