Abstract
In this investigation, replication techniques were employed to monitor the fatigue crack initiation and growth behavior of a pressure vessel steel. Crack initiation was found to be related to the presence of inclusions. In the crack initiation region, transgranular fracture was the prime mode of fracture mixed with some intergranular fracture. As the crack propagated, the extent of intergranular fracture appeared to increase, reach a maximum and then decrease. Near the final failure regime, dimpled fracture was dominant. The shape of surface cracks was found to be bounded by two simple geometrical models. Fatigue life analyses were performed. The predicted lives were in good agreement with the experimental results.
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