Abstract
In this study, GH4169 superalloy with varying initial δ phases was obtained through different annealing treatments. Cyclic stress–controlled low cycle fatigue (LCF) experiments were carried out at 650 °C to examine the influences of the initial δ phase content and morphology on LCF behavior. The results revealed that LCF life increased with prolonged annealing time, peaking at 7 h. However, beyond 8 h, a significant decrease in fatigue life occurred, followed by a slight increase with further extension of annealing time. The morphology and distribution of the δ phase played a crucial role in fatigue crack growth. The short rod-like δ phase effectively impeded crack propagation, contributing to an extended LCF life. Conversely, when the needle-like δ phase aligned with the crack growth direction, the crack growth rate increased, reducing LCF life. However, when the needle-like δ phase was oriented perpendicular to the crack growth direction, it obstructed fatigue crack propagation, thereby delaying fatigue fracture. Overall, annealing for 7 h provided the optimal LCF life at 650 °C.
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