T23耐热钢焊缝失效分析  

Failure Analysis on Weld Joint of T23 Heat-resistant Steels

作　　者：李文波[1] 沈丁杰[1] 谢亿[1] 胡加瑞[1] 欧阳克俭[1] 刘纯[1] 

机构地区：[1]国网湖南省电力公司电力科学研究院,长沙410007

出　　处：《发电设备》2015年第6期443-446,共4页Power Equipment

摘　　要：分析研究了T23钢作为低温再热器在服役过程中焊口泄漏的原因,发现热影响区再热裂纹的萌生是泄漏的起因。导致再热裂纹萌生的原因主要有:焊接过程中存在强制对口,使得焊口存在应力集中;焊口的热影响区组织为粗大的淬硬马氏体组织,且存在明显孔洞,使得该处的综合力学性能较低,促使再热裂纹的萌生。Analysis was performed to the leakage at weld joint of T23 steels in service as low- temperature reheater tubes, and the reheating cracks formed at heat-affected zone of the weld were believed to be the main cause. There are two reasons leading to formation of reheating cracks： one is the stress concentration, resulted from compulsive alignment of the tubes during welding; the other is that the microstructure in heat-affected zone is coarse martensite with obvious pores, making the strength and toughness of the weld reduced, and therefore promoting the formation of reheating cracks.

关 键 词：T23 强制对口 再热裂纹 热影响区 

分 类 号：TK225[动力工程及工程热物理—动力机械及工程]