汽轮机低压末级动叶片裂纹形成原因分析  

Analysis on Fracture Reasons of Turbine Low Pressure Last Moving Blades

作　　者：尤晋 黎华 张振顶 刘课秀 YOU Jin;LI Hua;ZHANG Zhending;LIU Kexiu

机构地区：[1]广州特种承压设备检测研究院,广东广州510663

出　　处：《电力系统装备》2023年第5期142-143,198,共3页Electric Power System Equipment

摘　　要：某火力发电厂在汽轮机组检修时发现低压末级动叶片出现裂纹,通过宏观检查、金相检验、化学成分分析、断口扫描和能谱分析等方法对裂纹产生原因进行了分析。结果表明,是叶片在腐蚀介质、应力及蒸汽冲击作用下,在冲蚀坑附近沿晶应力腐蚀开裂。Cracks were found on the last stage moving blades of a steam turbine unit in a thermal power plant during maintenance.The causes of the cracks were analyzed through macroscopic examination,metallographic examination,chemical composition analysis,fracture scanning,and energy spectrum analysis.The results show that the blade undergoes intergranular stress corrosion cracking near the erosion pit under the action of corrosive media,stress,and steam impact.

关 键 词：动叶片 裂纹 应力腐蚀开裂 

分 类 号：TM75[电气工程—电力系统及自动化]