CAJ | 학술논문

飞机在飞行一段时间后，输油管卡箍上的螺栓发生断裂。通过宏观检查、基体材料化学成分分析、断口宏观微观分析、能谱分析、硬度测试和金相检验等方法对断裂螺栓进行了分析。结果表明：螺栓的断裂性质为应力腐蚀；环境介质和工作应力的共同作用，使螺栓在应力集中的T型连接处产生应力腐蚀断裂；未按要求状态进行最终热处理导致螺栓组织异常、硬度偏高，从而增加了螺栓的应力腐蚀敏感性，对断裂的发生起到了促进作用。
비궤재비행일단시간후，수유관잡고상적라전발생단렬。통과굉관검사、기체재료화학성분분석、단구굉관미관분석、능보분석、경도측시화금상검험등방법대단렬라전진행료분석。결과표명：라전적단렬성질위응력부식；배경개질화공작응력적공동작용，사라전재응력집중적T형련접처산생응력부식단렬；미안요구상태진행최종열처리도치라전조직이상、경도편고，종이증가료라전적응력부식민감성，대단렬적발생기도료촉진작용。
A stainless steel bolt of the clamp of an aircraft oil pipeline fractured after serving for a while. The failure mode and cause of the bolt were analyzed by macro and micro observation, chemical composition analysis, energy spectrum analysis. hardness testing and metallographic examination. The results show that the fracture mode of the bolt is stress corrosion. The co-effect of environmental media and work stress led to the stress corrosion fracture of the bolt at the T root, where stress concentration existed. Improper heat treatment led to abnormal microstructure and high hardness, which increased the susceptibility to stress corrosion and promoted the fracture of the bolt.