宇航材料工艺2025，Vol.55Issue(3)：80-85,6.DOI:10.12044/j.issn.1007-2330.2025.03.010
基于螺栓断裂探讨Laves相对GH4169高温合金疲劳断裂的影响
The Influence of Laves Phase on the Fatigue Fracture of GH4169 High-temperature Alloy Based on Bolt Fracture
姜涛 1董鑫焱 2刘春江 1赵文侠 1刘昕宇1
作者信息
- 1. 中国航发北京航空材料研究院,北京 100095||中国航空发动机集团公司航空材料测试与评价重点实验室,北京 100095||航空材料测试与评价北京市重点实验室,北京 100095
- 2. 中国航发北京航空材料研究院,北京 100095||中国航空发动机集团公司航空材料测试与评价重点实验室,北京 100095||航空材料测试与评价北京市重点实验室,北京 100095||佳木斯大学材料科学与工程学院,佳木斯 154007
- 折叠
摘要
Abstract
Through visual inspection,macro/microscopic fracture morphology examination,microstructural characterization,and hardness testing of fractured bolts from a high-pressure oil filter subjected to 61 200 cycles of high-temperature pressure shock,this study investigated the abnormal fracture mechanism of GH4169 bolts connecting the outlet check valve and upper housing.The results indicate that the bolt fracture is fatigue-induced.Continuous chain-like Laves phases precipitated along grain boundaries significantly reduces material plasticity and abnormally increases notch sensitivity,ultimately triggering fatigue crack initiation.Additionally,stress concentration causes by small root radii at thread grooves and potential uneven assembly loads exacerbate fatigue crack propagation.This engineering failure case directly demonstrates the detrimental effects of grain boundary chain-like Laves phases on fatigue failure processes,providing critical insights to enhance researchers'and engineers'awareness of Laves phase-related hazards.关键词
GH4169高温合金/疲劳断裂/Laves相/应力集中/高温压力冲击Key words
GH4169 alloy/Fatigue fracture/Laves phase/Stress concentration/High-temperature pressure shock分类
航空航天引用本文复制引用
姜涛,董鑫焱,刘春江,赵文侠,刘昕宇..基于螺栓断裂探讨Laves相对GH4169高温合金疲劳断裂的影响[J].宇航材料工艺,2025,55(3):80-85,6.
