电厂汽轮机叶轮轮缘开裂失效分析  

Failure Analysis on Steam Turbine Wheel Flange Cracking

作　　者：王军明 商显栋 张号 张元[3] 郭相吉 仇性启[3] WANG Junming;SHANG Xiandong;ZHANG Hao;ZHANG Yuan;GUO Xiangji;QIU Xingqi(Heat and Power Plant,SINOPEC Qilu Branch,Zibo 255400,China;Shandong Special Equipment Inspection Institute CoLimited,Jinan 250101,China;College of New Energy,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石化齐鲁分公司热电厂,山东淄博255400 [2]山东省特种设备检验研究院有限公司,山东济南250101 [3]中国石油大学(华东)新能源学院,山东青岛266580

出　　处：《工业加热》2021年第2期46-48,52,共4页Industrial Heating

摘　　要：通过宏观检查、微观组织分析、扫描电镜分析、能谱分析及化学成分分析,对电厂汽轮机叶轮轮缘开裂情况进行了失效分析。结果表明,叶轮失效形式为应力腐蚀开裂,叶轮反T形槽内壁上方根部的应力集中与有腐蚀性元素存在的工作环境造成了叶轮开裂。A failure analysis of a steam turbine cracked wheel flange was performed.The study was based on the analysis of the fracture surface macro morphology,the material microstructure,the SEM,the energy spectrum and the chemical compositions.The results show that failure mode of the impeller is stress corrosion cracking.The stress concentration at the root above the inner wall of the impeller reverse T-slot and the working environment with corrosive elements cause the impeller to crack.

关 键 词：汽轮机 叶轮 轮缘反T形槽 应力腐蚀开裂 失效分析 

分 类 号：TK269[动力工程及工程热物理—动力机械及工程]