(北京航空材料研究院，北京 100095)
摘 要: 某型发动机在使用过程中一片钛合金转子叶片在叶根部发生断裂故障。针对该故障叶片，开展了外观形貌观察、断口宏微观观察、金相组织检查、化学成分及硬度检测等研究工作，结合发动机工作特点，确定了叶片断裂性质和原因。结果表明：压气机转子叶片断裂性质为高周疲劳断裂，疲劳裂纹的形成与叶片局部应力状态有关，而微动磨损促进了疲劳裂纹的萌生。
关键字: 转子叶片；疲劳；微动磨损；断裂；失效分析
（Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:A rotor blade of titanium alloy TC11 in an aero-engine fractured at the root segment during service. Appearance observation, fracture surface observation, metallurgical structure examination, chemical composition analysis and hardness testing were carried out to find out the failure mode and cause of the fractured blade. The results show that the fracture mode of the rotor blade is high-cycle fatigue fracture. The initiation of the fatigue crack is related to local stress state of the blade, and inching wear promotes the initiation of fatigue crack.
Key words: rotor blade; fatigue; inching wear; fracture; failure analysis
