Method | Measurement areas | Blocky austenite ( |
Film-like austenite ( |
Total austenite ( |
Ratio, |
---|---|---|---|---|---|
SEM – graphical analysis | 3 | 20.5 ± 3.2 | 23.7 ± 4.1 | 44.2 | 1.16 |
EBSD – phase distribution map | 3 | 22.3 ± 5.8 | – | – | – |
TEM – graphical analysis | 5 | – | 24.8 ± 9.1 | – | – |
TEM + EBSD | – | 22.3 ± 5.8 | 24.8 ± 9.1 | 47.1 | 1.11 |
Phase | Count number | SD, nm | Median, nm | Q1, nm | Q3, nm | ½IQR, nm | |
---|---|---|---|---|---|---|---|
Filmy austenite | 131 | 44.6 | 20.3 | 40.0 | 32.5 | 53.4 | 10.4 |
Bainitic ferrite | 131 | 106.8 | 40.7 | 102.0 | 76.3 | 131.8 | 27.7 |
Chemical composition, wt.% | |||||||||
---|---|---|---|---|---|---|---|---|---|
C | Si | Mn | Cr | Mo | Al | Ni | P | S | V |
0.94 | 1.54 | 0.44 | 1.05 | 0.01 | 0.022 | 0.18 | 0.01 | 0.007 | 0.006 |
Method | Measurement counts | SD, mm | Median, mm | Q1, mm | Q3, mm | ½IQR, mm | |
---|---|---|---|---|---|---|---|
Conventional etching by picric acid solution | 100 | 27.8 | 10.9 | 26.4 | 18.9 | 34.9 | 8.0 |
EBSD analysis using misorientation angles (20°–40°) | 100 | 18.7 | 9.2 | 17.8 | 13.9 | 21.8 | 4.0 |