Abstract
The present study aims at understanding the mechanisms of fatigue endurance through high-cycle fatigue (HCF) behavior of Alloy 617M at varying temperatures, ranging from 300 to 1023 K. Dynamic strain aging (DSA) was a key feature observed in this alloy at high temperatures (853-973 K), which also affects the cyclic life as well as the endurance limit. Furthermore, in situ precipitation of Cr23C6 and γ′ phase (Ni3(Al,Ti)) at 973 K during the course of HCF cycling is found to impart a beneficial effect on the HCF life of the alloy. At T > 973 K, effect of creep damage was found to be prominent, resulting in a deteriorating effect on HCF life. The role of DSA, precipitation and creep on the fatigue damage is assessed through in-depth microstructural characterization of the tested specimens, which is further utilized to develop a damage map across the temperatures 300-1023 K.
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Sarkar, A., Ghosh, C., Nagesha, A. et al. Mechanisms of Fatigue Endurance in Alloy 617M at Different Temperatures (300-1023 K). J. of Materi Eng and Perform 29, 5663–5671 (2020). https://doi.org/10.1007/s11665-020-05013-3
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DOI: https://doi.org/10.1007/s11665-020-05013-3