Low Cycle Fatigue and Fracture Behavior of Nickel-Base Superalloy CM247LC at 760°C
Low cycle fatigue (LCF) behavior of coarse and fine grained superalloy CM247LC at 760°C has been investigated. Both coarse and fine grained CM247LC showed similar cyclic stress response, however, the fine grained CM247LC specimen exhibited relatively uniform and superior fatigue properties to the coarse grained one. It was found that fatigue crack initiation of the alloy was keen to the applied strain range. Fatigue crack initiated at the surface of the specimen with high strain range (∆εt≥( 0.7%) while the initiation site moved to the internal defects at low strain range (∆εt≤0.6%).
S.-G. Kang and T. Kobayashi
S. M. Seo et al., "Low Cycle Fatigue and Fracture Behavior of Nickel-Base Superalloy CM247LC at 760°C", Materials Science Forum, Vols. 449-452, pp. 561-564, 2004