mseasuslides: muddiest point: phase diagrams v fe-fe3c microstructures s…

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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Phase  CalculaDons  

6.67  1  0  Co  

ComposiDon-­‐  Wt%  C    

1000  

800  

600  

400  

Tempe

rature  

α    

α    +Fe3C  

Fe3C  +γ    

0.76%  

Fe3C  

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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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 For  1030  steel  at  1000°C      

Single  Phase  Region  Microstructure  

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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  

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Cα Cγ  

Q  P  

0.3%  

X

Fe3C  

727°C  

0.45%  0.01%  

Given  1)  850°C    2)  1030  Steel    

Microstructure:  

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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  

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Cα Cγ  

R  S  

0.3%  

X

0.022  %  

0.76%

Fe3C  

727°C  

Given  1)  728°C    2)  1030  Steel    

Microstructure:  

α  

γ  

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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  

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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  

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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  

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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  

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Fe3C  

α    

X  

X  

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?