Abstract

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.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.