Calculation of Time Temperature Transformation Diagrams

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Calculation of Time Temperature Transformation
Diagrams
H. K. D. H. Bhadeshia Metal Science 16 (1982)
159-165 cml.postech.ac.kr
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Thermodynamics
g
a
Gibbs free energy
x
Carbon
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Bainite-start temperature
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Fe-0.33C-0.18Si-1.48Mn-0.26Ni-0.16Cr-0.27Mo wt
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Fe-0.27C-0.13Si-0.60Mn-0.19Ni-0.74Cr-0.55Mo wt
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Fe-0.38C-0.25Si-1.49Mn-0.24Ni-0.14Cr-0.41Mo wt
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Fe-0.38C-0.2Si-0.69Mn-1.58Ni-0.95Cr-0.26Mo wt
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Fe-0.32C-0.28Si-0.61Mn-3.22Ni-0.63Cr-0.22Mo-0.025V
wt
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Fe-0.39C-0.23Si-0.62Mn-1.44Ni-1.11Cr-0.18Mo wt
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Fe-0.42C-0.31Si-0.67Mn-2.53Ni-0.72Cr-0.48Mo wt
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Fe-0.42C-0.31Si-0.67Mn-2.53Ni-0.72Cr-0.48Mo wt
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calculations
800
2
1
3
4
700
5
6
600
500
Temperature / C
1. Fe-0.4C
2. Fe-0.4C-2Si
3. Fe-0.4C-1Ni
400
4. Fe-0.4C-1Mn
5. Fe-0.4C-1Mn-1Cr
300
6. Fe-0.4C-2Mn
200
0 1 2 3
4 5
10 10 10 10 10
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Time / s
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cooling
x 0.05
curve
x 0.10
isothermal
Temperature
transformation
?t
i
curves
t
i
Time