1000 MW超超临界机组三通对接焊缝裂纹失效分析与处理  

Analysis and Treatment of Tee Butt Welding Cracks Failure in 1000 MW Ultra-Supercritical Unit

作　　者：杨成明 邱坚 周哲 袁丹 王文良 YANG Chengming;QIU Jian;ZHOU Zhe;YUAN Dan;WANG Wenliang(Hunan Xiangdian Boiler and Pressure Vessel Inspection Center Co.,Ltd.,Changsha 410004,China;China Energy Construction Group Hunan Thennal Power Construction Co.,Ltd,Changsha 410114,China;School of Materials Science and Engineering,Changsha University of Science and Technology,Changsha 410114,China;Hunan Provincial Special Equipment Inspection and Testing Research Institute Loudi Branch,Loudi 417000,China)

机构地区：[1]湖南省湘电锅炉压力容器检验中心有限公司,湖南长沙410004 [2]中国能源建设集团湖南火电建设有限公司,湖南长沙410114 [3]长沙理工大学材料科学与工程学院,湖南长沙410114 [4]湖南省特种设备检验检测研究院娄底分院,湖南娄底417000

出　　处：《湖南电力》2022年第6期119-122,128,共5页Hunan Electric Power

基　　金：湖南省教育厅自然科学研究项目(21B0352)。

摘　　要：某1000MW超超临界机组汽水分离器进口集箱三通对接焊缝存在整圈环向裂纹。利用化学成分分析、硬度试验、金相组织分析、电镜分析等实验方法,对裂纹产生原因进行了分析。结果表明焊接及热处理工艺执行不到位、三通结构不合理是焊缝熔合线处产生再热裂纹的原因,优化三通结构、焊接及热处理工艺可有效预防该类三通焊接裂纹的产生。There is a whole circle of circumferential cracks in steam-water separator inlet header tee butt weld for a 1 000MW ultra-supercritical unit. Through chemical composition analysis, hardness test, metallographic structure analysis, electron microscope analysis and other experimental methods, the causes of cracks are analyzed.The results show that the reason of reheat crack at weld fusion line is that the welding and heat treatment process is not carried out properly and the structure of tee is unreasonable.Optimizing the structure, welding and heat treatment process of tee can effectively prevent the generation of welding crack of this kind of tee.

关 键 词：超超临界 12CR1MOV 焊缝 再热裂纹 

分 类 号：TK226.2[动力工程及工程热物理—动力机械及工程]