Year: 2025
Type: preprint
Abstract: Foreign object damage (FOD) is a common issue during aero-engine operation process, which can usually lead to high-cycle fatigue (HCF) fracture failure of fan and compressor blades. To investigate the effect of post-impact heat treatment on the HCF performance of compressor blade alloy GH4169 with FOD, this study uses an FOD simulation device to conduct impact tests on specimens. The impacted specimens are subjected to heat treatment of varying duration, followed by HCF testing. The results show the presence of adiabatic shear bands (ASB) on the exit side of the impact crater, with lengths mostly in the range of 100-250 μm. HCF tests reveal that the microscopic defects generate by FOD significantly reduce the fatigue strength of GH4169 alloy. But its mechanical properties and fatigue resistance are enhanced to some extent by certain post-impact heat treatment process, and the beneficial influence on the HCF strength is most evident at the stress ratio of -1 condition associated with the fatigue crack initiation mode transition from ASB cracking to slip band cracking. These findings show that post-impact heat treatment can somewhat restore the fatigue performance of GH4169 alloy after FOD, contributing to improved service life and reliability of aero-engine compressor blades.
Authors: Xiaojun Guo, Xu Jia, 恒 曹, Y. Chen, Rong Jiang, Yingdong Song
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
OpenAlex ID: W4415102401
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