| Specimens | Stress amplitude, σa/MPa | |||||||||
| 146 | 158 | 169 | 180 | 191 | 203 | 214 | 225 | 236 | ||
| HT490 | As-welded | Not failure | ICHAZ | ICHAZ | CCHAZ | ICHAZ | - | - | - | - |
| FSP-modified | - | Not failure | Not failure | Not failure | BM | - | - | - | - | |
| HT780 | As-welded | - | - | - | Not failure | CGHAZ | CGHAZ | CGHAZ | CGHAZ | CGHAZ |
| FSP-modified | - | - | - | - | Not failure | SZ | SZ | SZ | SZ | |