摘要
发动机厂内试车后进行荧光检测,发现多件K465合金涡轮叶片在叶冠叶身出现裂纹。采用体视显微镜和扫描电镜对叶片进行裂纹形貌及断口分析、金相组织检查等。结果表明:裂纹性质为疲劳开裂,起源于内腔表面。裂纹产生原因是叶片采用铝基型芯浇注以及模组方式不当,使得该位置产生较大铸造应力。通过将铝基型芯改为硅基型芯、改进铸造工艺和优化模组方式,可降低叶片的铸造应力,预防此类故障。
Several K465 alloy turbine blades were found to have cracks in blade shroud and blade body by fluorescence inspection after test run in factory.Stereomicroscope and scanning electron microscope were used to analyze the crack morphology,crack fracture and metallographic structure of the blade.The results show that the nature of the crack is fatigue cracking,which originates from the surface of the inner cavity.The reason for the crack is that the application of the aluminum-based core casting and the improper module caused higher casting stress in certain position.By changing the aluminum-based core to a silicon-based core,improving the casting process and optimizing the module mode,the casting stress of the blade is reduced to prevent such failures.
作者
孙旭波
刘丽玉
杨瑞宁
余昌奎
陈俊
SUN Xu-bo;LIU Li-yu;YANG Rui-ning;YU Chang-kui;CHEN Jun(The Military Representative Office of the Naval Equipment Department stationed in Qingdao area,Shandong Qingdao 266300,China;AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;AVIC Failure Analysis Center,Beijing 100095,China;Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,Beijing 100095,China;Key Laboratory of Aeronautical Materials Testing and Evaluation,Aero Engine Corporation of China,Beijing 100095,China;Guiyang AECC Power Investment Casting Co.,Ltd.,Guiyang 550014,China;The Key Laboratory of Space Applied Physics and Chemistry,Ministry of Education,School of Physical Science and Technology,Northwest Polytechnical University,Xi’an 720072,China)
出处
《失效分析与预防》
2023年第1期62-66,共5页
Failure Analysis and Prevention
关键词
低压涡轮叶片
K465合金
裂纹
铸造应力
铝基型芯
铸造工艺
low-pressure turbine blade
K465 alloy
crack
casting stress
aluminum based core
casting process
