Research Article
Effect of Microstructure on the Corrosion Fatigue Crack Growth of Low and Medium Steels
Table 4
The Paris equations of the corrosion fatigue curves of 45 steel under three heat treatment states.
| | Heat treatment process | Microstructure | ΔK range () | C | n | Paris formula |
| | Full annealing | 60%ferrite + 40%pearlite | 17∼21 | 1.12 × 10−14 | 14.41 | da/dN = 1.12 × 10−14 × ΔK14.41 | | Normalizing | 30%ferrite + 70%pearlite | 17∼26 | 3.53 × 10−10 | 3.02 | da/dN = 3.53 × 10−10 × ΔK3.02 | | Quenching and tempering | Tempered fine pearlite | 16∼27 | 1.38 × 10−11 | 3.73 | da/dN = 1.38 × 10−11 × ΔK3.73 |
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