Table 2: Ferritic cell size of ADI with respect to temperature and heat treatment process.
| Austempering condition | Conventional | Plastic deformation & Single-step process | Plastic deformation & Two-step process |
| Temperature | Ferritic cell size | ||
| 399 ℃ | 27 ± 3.2 | - | - |
| 385 ℃ | 26 ± 8.5 | 19.7 ± 5.6 | 21.8 ± 1.1 |
| 371 ℃ | 24.3 ± 3.3 | - | - |
| 360 ℃ | - | 19.5 ± 7.3 | 22.1 ± 5.0 |
| 316 ℃ | - | 17.3 ± 5.4 | 18.3 ± 5.5 |
| 288 ℃ | 19.7 ± 2.6 | 17.0 ± 5.7 | 18.4 ± 4.9 |
| 260 ℃ | 17.5 ± 4.0 | - | - |