某电厂低温过热器出口集箱接管角焊缝开裂原因  

Causes of fillet weld cracking of low temperature superheater outlet header tube in a power plant

作　　者：汪博 周翊航 李望 赵炜炜 赵宁宁 WANG Bo;ZHOU Yihang;LI Wang;ZHAO Weiwei;ZHAO Ningning(Zhejiang Zheneng Technology Research Institute Co.,Ltd.,Hangzhou 311121,China;Zhejiang Provincial Key Laboratory of Energy Conservation&Pollutant Control Technology for Thermal Power,Hangzhou 311121,China;Zhejiang Zheneng Taizhou Second Power Generation Co.,Ltd.,Taizhou 317109,China)

机构地区：[1]浙江浙能技术研究院有限公司,杭州311121 [2]浙江省火力发电高效节能与污染物控制技术研究重点实验室,杭州311121 [3]浙江浙能台州第二发电有限责任公司,台州317109

出　　处：《理化检验(物理分册)》2025年第1期62-65,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某电厂低温过热器出口集箱接管角焊缝产生裂纹,采用宏观观察、化学成分分析、金相检验、扫描电镜分析、硬度测试等方法分析了裂纹产生的原因。结果表明:裂纹启裂于接管外壁角焊缝熔合线附近粗晶区,终止于热影响区细晶区,具有明显的再热裂纹特征;裂纹产生时间较长且未发生明显扩展,表明开裂是在集箱管接座焊后热处理过程中发生的。Cracks were found in the fillet weld of the tube of the outlet header of the low temperature superheater in a power plant.The causes of the cracks were analyzed by means of macroscopic observation,chemical composition analysis,metallographic examination,scanning electron microscope analysis and hardness test.The results show that the crack initiated in the coarse grain zone near the fusion line of the fillet weld on the outer wall of the tube and terminated in the fine grain zone of the heat affected zone,which had obvious reheat crack characteristics.The crack generation time was long and no obvious expansion occurred,indicating that the cracking occurred during the post-weld heat treatment process of the header tube socket.

关 键 词：15CRMO钢 管接座 角焊缝 再热裂纹 焊后热处理 

分 类 号：TG178[金属学及工艺—金属表面处理] TG115.2[金属学及工艺—金属学]