超临界锅炉顶棚过热器弯管断裂失效分析  

Fracture Failure of Bent Pipe of Roof Superheater in Supercritical Boiler

作　　者：郑相锋[1] 冯砚厅[1] 牛晓光[1] 徐雪霞[1] 

机构地区：[1]河北省电力研究院锅检所,河北石家庄050021

出　　处：《热加工工艺》2011年第22期201-202,共2页Hot Working Technology

基　　金：河北省电力公司计划资助项目(2010-040)

摘　　要：采用宏观分析、力学分析、化学分析、金相检验及扫描电镜等方法对多次出现断裂的超临界锅炉顶棚过热器弯管(材质为12Cr1MoV)进行失效分析。结果表明,顶棚过热器弯管断裂属于脆性断裂,应力过大和弯管环境温度过低是造成泄漏的主要诱因。Through the methods of microscope analysis,mechanical analysis,chemical analysis,metallographic examination and scanning electron microscope,the causes resulting in rupture of bent pipe（12Cr1MoV） of roof superheater in insupercritical boiler were analyzed.The results indicate that the bent pipe fracture failure is brittle fracture.The welding defects,excessive stress and lower working temperature in bending are the primar reasons for fracture failure.

关 键 词：超临界锅炉 顶棚过热器 失效分析12Cr1MoV 

分 类 号：TG404[金属学及工艺—焊接]