Abstract
High temperature fatigue performance plays a critical role in the service of turbine blades, and casting defects like low angle grain boundary (LAGB) in single crystal superalloys would severely affect the service performance of blades. This study demonstrates B-induced pronounced improvement in low cycle fatigue (LCF) lifetime at 980 °C for the PWA1484 artificial bicrystal with 6° LAGB. Such an effective increment in LCF lifetime was achieved by stabilising LAGB through a delicate modulation of LAGB composition without boride. Moreover, B-induced matrix softening featured by homogenous distribution of fatigue deform zones with high density of dislocations was evidenced.
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