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发动机工作过程中压气机叶片断裂,分解检查后根据损伤情况确定了首断件;通过对首断件断口宏观分析,确定断裂性质为疲劳断裂,起始于进气边一侧;断口显微分析结果表明:叶片断裂系起始于腐蚀损伤的疲劳断裂;漆层分析表明基体腐蚀损伤的原因是断口区漆层破损,在高湿和含盐环境下,腐蚀介质沉积在漆层破损处,叶片在破损处出现晶间腐蚀,萌生裂纹并扩展,直至断裂,漆层破损的原因为外来物打伤;针对故障原因,细化了发动机低压压气机二级转子叶片外场检查方法。
During the engine working, the compressor blades were broken and decomposed, and then the first part was determined according to the damage. By the macroscopic analysis of the first part, the fracture property was determined as fatigue fracture, which started from the inlet side. The fracture microstructure analysis The results show that the rupture of the blade begins with the fatigue fracture of the corrosion damage. The analysis of the paint layer shows that the corrosion damage of the matrix is caused by the damage of the paint layer in the fracture area. Under the condition of high humidity and salinity, Intergranular corrosion, crack initiation and propagation were observed in the damaged area until the fracture was broken. The cause of damage to the paint layer was wounded by foreign objects. Aiming at the cause of failure, the out-of-field inspection method for the second-stage rotor blades of the LPG compressor was refined.