Abstract
Abstract Shot peening was performed on smooth (geometrical notch factor kt = 1.0) and circumferentially notched (kt = 2.3 and 3.5) specimens. In addition, some notched (kt = 3.5) specimens were deep rolled. Axial fatigue tests were done at room temperature and 650°C using a stress ratio of R = 0.1. At ambient temperature, shot peening markedly increased the high-cycle fatigue (HCF) strengths at R = 0.1 of smooth and, particularly, notched specimens with respect to the electropolished reference samples. In contrast, shot peening was found to decrease the HCF strength of smooth samples at elevated temperature (650°C) while the HCF strength of notched specimens was slightly increased. Best elevated-temperature HCF strength of notched conditions was observed after deep rolling.
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