2.1.1 The following list covers possible treatment methods and how they influence the
properties that are decisive for the fatigue strength.
Table 3.2.1 Surface treatment methods and the characteristics they affect.
| Treatment method
|
Affecting
|
| Induction hardening
|
Hardness and residual stresses
|
| Nitriding
|
Chemistry, hardness and residual
stresses
|
| Case hardening
|
Chemistry, hardness and residual
stresses
|
| Die quenching (no temper)
|
Hardness and residual stresses
|
| Cold rolling
|
Residual stresses
|
| Stroke peening
|
Residual stresses
|
| Shot peening
|
Residual stresses
|
| Laser peening
|
Residual stresses
|
| Ball coining
|
Residual stresses
|
2.1.2 It is important to note that since only induction hardening, nitriding, cold rolling
and stroke peening are considered relevant for marine engines, other methods as well
as combination of two or more of the above are not dealt with in this document. In
addition, die quenching can be considered in the same way as induction
hardening.