Abstract
The gigacycle fatigue properties and crack growth behavior of two X80 pipeline steels with different microstructures of acicular ferrite (AF) and dual-phase (DP) were investigated. The experimental results show that the S-N curves of the two steels exhibit continuous declines over 109 cycles without fatigue limits, with fatigue strengths of 428 ± 7 MPa and 363 ± 8 MPa respectively. Most fatigue cracks in the DP steel initiated from the surface, while the fatigue fracture of the AF steel was mainly initiated in the internal inclusions. The DP steel exhibited a higher fatigue crack growth (FCG) rate than the AF steel.
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