水冷壁管接头开裂原因  

Cracking reason of water wall pipe joint

作　　者：吕华亭[1] 王胜辉[1] 孙嘉豪 LYU Huating;WANG Shenghui;SUN Jiahao(Shanghai Institute of Special Equipment Inspection and Technical Research,Shanghai 200062,China)

机构地区：[1]上海市特种设备监督检验技术研究院,上海200062

出　　处：《理化检验（物理分册）》2024年第7期59-62,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某电厂发生锅炉水冷壁管开裂现象。采用宏观观察、化学成分分析、金相检验、硬度测试等方法分析了水冷壁管开裂的原因。结果表明:水冷壁管接头对接环焊缝焊接产生了残余应力,材料中存在焊接缺陷,在高温、高压环境下,缺陷逐渐扩展为孔洞,并对其他管壁造成冲蚀破坏,最终导致水冷壁管开裂。Cracking of boiler water wall pipe occurred in a power plant.The causes of cracking in water wall pipes were analyzed using methods such as macroscopic observation,chemical composition analysis,metallographic examination and hardness testing.The results show that residual stress was generated during the welding of the circumferential weld seam at the joint of the water wall pipe,and there were welding defects in the material.Under high temperature and pressure environments,the defects gradually expanded into holes and caused erosion damage to other pipe walls,ultimately led to cracking of the water wall pipe.

关 键 词：水冷壁管 开裂 焊接焊缝 残余应力 冲蚀 孔洞 

分 类 号：TG115.2[金属学及工艺—物理冶金] TB31[金属学及工艺—金属学]