Fatigue crack propagation in a C70250 alloy

Abstract The fatigue behavior of a C70250 alloy has been studied. The crack propagation behavior was investigated by performing fatigue crack propagation tests at load ratio R varying over the range 0.3–0.7. A considerable crack deflection and jagging was observed at low R-ratio. The study of the crack paths revealed that the closure effect is more relevant for R = 0.3. In this case the crack path is characterized by considerable peak heights and deflection angles and the closure effect is mainly related to the fracture surface mismatch. The main crack propagation micro-mechanisms observed are transgranular with few areas characterized by intergranular fracture.