长沙理工大学学报（自然科学版）2025，Vol.22Issue(2)：132-141,10.DOI:10.19951/j.cnki.1672-9331.20240416001
GH4169合金高温低周疲劳损伤的声发射特性分析
Acoustic emission characteristics of high-temperature and low-cycle fatigue damage in GH4169 alloy
摘要
Abstract
[Purposes]GH4169 alloy,as a material for key components of high-end equipment such as aerospace engines,plays an important role in ensuring the service safety of the equipment by detecting its fatigue damage at high temperatures.[Methods]In this study,acoustic emission testing technology was employed to explore the damage characteristics of GH4169 alloy under high-temperature and low-cycle fatigue loading.The damage stages and extent of GH4169 alloy during high-temperature and low-cycle fatigue experiments were analyzed through parameters such as acoustic emission impact count and b value.Meanwhile,the average frequency(AF)and risetime amplitude(RA)were used to investigate the damage modes of the alloy in various fatigue stages.[Findings]Fatigue damage stages can be delineated based on cumulative acoustic emission parameters,and b value decreases with increasing severity of damage.The damage mode in the crack initiation stage is dominated by tensile failure,while the damage mode in the stable propagation stage is mainly dominated by shear failure.In the fracturing destabilization stage,the damage mode involves both tensile failure and shear failure.[Conclusions]The findings of this study provide an important theoretical basis for identifying the fatigue status of high-end critical components manufactured from GH4169 alloy.关键词
声发射/GH4169合金/高温低周疲劳/b值/AF-RA值Key words
acoustic emission/GH4169 alloy/high-temperature and low-cycle fatigue/b value/AF-RA value分类
通用工业技术引用本文复制引用
付雅琪,舒佳,杨会兵,王向红..GH4169合金高温低周疲劳损伤的声发射特性分析[J].长沙理工大学学报（自然科学版）,2025,22(2):132-141,10.基金项目
湖南省自然科学基金项目(2023JJ60158) Project(2023JJ60158)supported by Natural Science Foundation of Hunan Province （2023JJ60158）
