期刊
MATERIALS LETTERS
卷 277, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.matlet.2020.128377
关键词
Ni-based superalloy; Precipitation-hardening; Fatigue strength; Axial fatigue; Torsional fatigue
资金
- JSPS KAKENHI [JP19J10689]
Fatigue strength of precipitation-hardened materials is well known to be lower than that expected from their high yield and tensile strengths. To elucidate the reasons behind such anomaly, torsional fatigue tests, in addition to uniaxial fatigue tests, were conducted on samples of the Ni-based superalloy 718, subjected to two different heat treatments (solution-annealing and precipitation-hardening). Despite the significant differences in tensile and yield strengths between the two samples, the torsional fatigue strengths were mutually equivalent. This result was interpreted in light of the resistance against fatigue crack-initiation and -propagation in shear-mode, which cannot be enhanced by precipitation-hardening due to the depletion of precipitates by persistent dislocations motion within localized glide-bands. (C) 2020 Elsevier B.V. All rights reserved.
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