Title: Simultaneous Transformation Kinetics
1Simultaneous Transformation Kinetics
- Avrami theory
- Adapted for many reactions occurring together
- Ferrite, Widmanstatten ferrite, pearlite.
- Complex carbide-precipitation reactions
- Competition between inter- and intra-granularly
nucleated reactions - Some difficulties
2DISPLACIVE
RECONSTRUCTIVE
31.00
Allotriomorphic
PREDICTED FRACTION
Widmanstatten
Pearlite
0.75
0.50
0.25
0.00
0.00
0.25
0.50
0.75
1.00
MEASURED FRACTION
Jones Bhadeshia, 1996
4?
?
?
?
?
CONSTRAINED
UNCONSTRAINED
5100 microns austenite grain size
PEARLITE
?
w
11 K/min
?
101 K/min
Jones Bhadeshia, 1996
Temperature / C
630 microns austenite grain size
PEARLITE
?
11 K/min
?
w
101 K/min
Jones Bhadeshia, 1996
Temperature / C
7Robson, Jones Bhadeshia, 1996
8Steel F (10Cr1MoV)
Robson Bhadeshia, 1996
9Baker Nutting 2.25Cr1Mo Steel
Robson Bhadeshia, 1996
10NF 616
Robson Bhadeshia, 1996
11Driving force for M2X precipitation
Robson Bhadeshia, 1996
12Steel F (10CrMoV)
Robson Bhadeshia, 1996
13M2X precipitation
Robson Bhadeshia, 1996
14M23C6 precipitation
Robson Bhadeshia, 1996
15Laves phase precipitation
Robson Bhadeshia, 1996
16Robson Bhadeshia, 1996
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19Kasuya, Ichikawa, Fuji and Bhadeshia, 1999
20Kasuya, Ichikawa, Fuji and Bhadeshia, 1999
210.7
0.6
Prestrain
0.5
0.0
0.4
0.18
0.3
0.36
0.2
0.63
0.1
0.0
Singh Bhadeshia, 1996
0
100
200
300
400
500
600
Time / s
220.7
Prestrain
0.6
0.0
0.5
0.4
0.63
0.3
0.2
0.1
0.0
Singh Bhadeshia, 1996
0
100
200
300
400
500
600
Time / s
23M
of the alloy
s
400
350
300
0.0
0.2
0.4
0.6
Singh Bhadeshia, 1996
Prestrain
24o
500
C
o
475
C
0.6
o
450
C
o
400
C
0.4
0.2
0.0
0.0
0.2
0.4
0.6
0.8
1.0
Prestrain
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