发动机加力扩散器快卸环失效分析  

FAILURE ANALYSIS OF QUICK-RELEASE RING IN ENGINE AFTERBURNER DIFFUSER

作　　者：徐志刚[1] 吕凤军[1] 李权[1] 

机构地区：[1]北京航空工程技术研究中心,北京100076

出　　处：《腐蚀科学与防护技术》2009年第5期502-504,共3页Corrosion Science and Protection Technology

摘　　要：在外场发动机排故中,发现加力扩散器快卸环有裂纹和掉块现象,通过对断口的宏观和微观分析以及金相检验,结果表明,加力扩散器快卸环的裂纹是因为晶间腐蚀损伤诱发的应力腐蚀开裂所致,表面掉块是在振动应力作用下由晶间腐蚀造成的晶粒脱落.During a routine inspection of an engine for troubleshooting, damages of crack and spall off are observed on an quick-release ring in an afterburner diffuser. In order to investigate the damage mechanism and failure causes, macroscopic and microscopic observations of the fractured surfaces and rnicrostructure investigation have been performed. The results show that the crack of the quick-release ring is due to stress corrosion induced by intergranular corrosion, and the spall off from the surface of quick-release ring is also due to intergranular corrosion under the vibrational stress.

关 键 词：快卸环 晶间腐蚀 应力腐蚀 

分 类 号：TG172.9[金属学及工艺—金属表面处理]