calculation of time temperature transformation diagrams h. k. d. h. bhadeshia metal science 16...
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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
log{time}
Ms
ferrite
pearlite
bainite
martensite
Ae3
upper bainite
lowerbainite
Widmanstatten ferriteBs
Ws
x
Gibbs free energy
Carbon
G m
xm
G
Thermodynamics
Bainite-start temperature
Fe-0.33C-0.18Si-1.48Mn-0.26Ni-0.16Cr-0.27Mo wt%
Fe-0.27C-0.13Si-0.60Mn-0.19Ni-0.74Cr-0.55Mo wt%
Fe-0.38C-0.25Si-1.49Mn-0.24Ni-0.14Cr-0.41Mo wt%
Fe-0.38C-0.2Si-0.69Mn-1.58Ni-0.95Cr-0.26Mo wt%
Fe-0.32C-0.28Si-0.61Mn-3.22Ni-0.63Cr-0.22Mo-0.025V wt%
Fe-0.39C-0.23Si-0.62Mn-1.44Ni-1.11Cr-0.18Mo wt%
Fe-0.42C-0.31Si-0.67Mn-2.53Ni-0.72Cr-0.48Mo wt%
Fe-0.42C-0.31Si-0.67Mn-2.53Ni-0.72Cr-0.48Mo wt%
12
3 45
6
1. Fe-0.4C2. Fe-0.4C-2Si3. Fe-0.4C-1Ni4. Fe-0.4C-1Mn5. Fe-0.4C-1Mn-1Cr6. Fe-0.4C-2Mn
0 1 2 3 4 5 10 10 10 10 10 10
Time / s
800
700
600
500
400
300
200
Temperature / C
calculations
∆ti
ti
cooling curve
Time
Temperature
isothermal transformation curves
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