期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 332, 期 1-2, 页码 236-248出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(01)01742-7
关键词
high cycle fatigue; low cycle fatigue; plastic deformation; Ni-base superalloy; life prediction
The effects and mechanisms of low cycle fatigue (LCF) on subsequent high cycle fatigue (HCF) limit were investigated in nickel-base superalloy Udimet 720 at room temperature at a stress ratio of 0.1 and frequencies of 1 and 25 Hz for LCF and HCF, respectively. The HCF limits were determined after various fractions of LCF life consumption. Results show that small fractions of LCF life consumption significantly reduce the subsequent HCF limit, and the reduction is attributed to a combination of LCF damage and the plastic deformation induced during the LCF process, Microstructural characterization indicates that both LCF and plastic deformation reduce the HCF limit by activating the slip systems in the FCC structure of the material, creating favorable sites for easy subsequent HCF damage. (C) 2002 Elsevier Science B.V. All rights reserved.
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