Experimental on ultrahigh frequency vibration fatigue of GH4169 nickel-based superalloy
Year: 2025
Type: article
Abstract: To address the very high cycle fatigue（VHCF）issue of GH4169 nickel-based superalloy，which is widely utilized in aero-engines，a fatigue specimen subjected to 20 kHz ultrahigh frequency vibration is designed and tested utilizing a piezoelectric ultrasonic fatigue testing system. At room temperature，the P-S-N curves for VHCF of GH4169 nickel-based superalloy are obtained under various survival probabilities of 5%，50%，and 95%. The experimental findings reveal that the GH4169 material’s curve exhibits a downward trend when the fatigue life attains 107 cycles，indicating the absence of a fatigue limit and the persistence of fatigue failure. Fracture analysis results indicate that the majority of VHCF cracks initiate from the surface or subsurface of the specimen，with both single-source and multi-source cracking observed. The cracking modes encompass surface sliding cracking and non-metallic inclusion-induced sliding cracking.
Authors: WANG Zhaohan, PAN Kai, CHEN Yonghui, HANG Chao, WANG Yongjie, YAN Qun
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6884724995
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