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Effects of temperature and shot peening on S-N behavior of a PM Ni-base superalloy UDIMET 720

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Abstract

Fatigue S-N (stress vs life) curve behavior for a powder metallurgy (PM) Ni-base superalloy UDIMET 720 in both polished and shot-peened surface conditions was investigated at room temperature and 600 °C in air. Tests were carried out under four-point bending at a load ratio of 0.1 and a frequency of 10 Hz. At 600 °C, an offset S-N curve was found for both polished and shot-peened surface conditions. This offset S-N curve is deduced to be controlled by the location of crack nucleation sites. Observations and deductions of crack nucleation sites, crack nucleation life, crack closure, environmental attack, and cyclic softening and hardening have been used to explain the experimental results.

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Luo, J., Bowen, P. Effects of temperature and shot peening on S-N behavior of a PM Ni-base superalloy UDIMET 720. Metall Mater Trans A 35, 1007–1016 (2004). https://doi.org/10.1007/s11661-004-1004-9

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