发动机涡轮Ⅱ级叶片断裂原因分析

某航空发动机涡轮Ⅱ级叶片在役其间发生断裂。通过断口宏微观观察、金相组织检查、化学成分及硬度检测等手段确定了叶片断裂性质和原因。结果表明：涡轮Ⅱ级叶片断裂性质为振动疲劳。工作应力、热虚力、制造质量、外物损伤、环境损伤都将促进此类故障发生。根据上述结论及影响因素，提出了一系列在修理和使用过程中应采取的控制措施，取得了较好的成效。

Failure Analysis of Certain Model AeroengineⅡ Grade Turbine Blade

A grade II turbine blade in an aeroengine fractured during service.The fracture mode and cause were analyzed and determined by fracture surface observation,metallurgical structure examination,chemical analysis and hardness testing.Additionally,the preventive measures of such faults were introduced.The results show that the fracture mode of the turbine blade is vibration fracture.Such faults may result from many factors,including working stress,thermal stress,manufacturing quality,foreign body damage and env...