末级过热器12Cr2MoWVTiB/TP347H异种钢焊口失效分析  

Analysis of Weld Bond Failure of 12Cr2MoWVTiB/TP347H Dissimilar Steel in Final Superheater

作　　者：胡加瑞[1] 刘旺[2] 谢亿[1] 王军[1] 欧阳克俭[1] 李文波[1] 

机构地区：[1]国网湖南省电力公司电力科学研究院,湖南长沙410007 [2]国网湖南省电力公司物资部,湖南长沙410007

出　　处：《矿冶工程》2015年第1期123-125,共3页Mining and Metallurgical Engineering

摘　　要：通过断口宏观形貌、硬度试验、断口微观组织等分析,研究了1 025 t/h锅炉末级过热器12Cr2Mo WVTi B/TP347H异种钢焊口运行80 000 h后的断裂失效特征。结果表明:在应力幅值较高的交变载荷作用下,12Cr2Mo WVTi B侧熔合线区域组织较差,同时存在碳迁移倾向,此处最易产生裂纹,导致失效。The fracture features of the weld bond of 12Cr2MoWVTiB/TP347H dissimilar steel in a final superheater operated for 80 000 hrs in a 1 025 t/h boiler was investigated by fracture macro-morphology analysis,hardness test and fracture microstructure analysis. The results showed that under the alternating loads with high stress amplitude,the weld bond at 12Cr2MoWVTiB side was weak,where carbon also tended to migrate. Cracks most easily occur at this place,resulting in failure.

关 键 词：12CR2MOWVTIB TP347H 异种钢焊接 失效分析 焊缝 断口形貌 

分 类 号：TK223.3[动力工程及工程热物理—动力机械及工程]