The influence of the strength matching of weld on creep damage of dissimilar welded joint between martensitic and bainitic heat resistant steel
The mechanical properties, creep rupture strength, creep damage and failure characteristics of dissimilar metal welded joint (DMWJ) between martensitic (SA213T91) and bainitic heat-resistant steel (12Cr2MoWVTiB) have been investigated by means of pulsed argon arc welding, high temperature accelerated simulation, mechanical, creep rupture test, scanning electronic microscope (SEM). The results show that there is a marked drop of mechanical properties of undermatching joint, and low ductility cracking along weld/G102 interface is induced due to creep damage. Creep rupture strength of overmatching joint is the least. The mechanical properties of medium matching joint are superior to those of overmatching and undermatching joint, and creep damage and failure tendency along the interface of weld /12Cr2MoWVTiB are lower than those of overmatching and undermatching joint after accelerated simulation 500h, 1000h, 1500h, and the creep rupture strength ( ) of medium matching joint is the same as that of undermatching joint. Therefore, it is reasonable that the medium matching material is used for dissimilar welded joint between martensitic and bainitic steel.
Martensitic heat-resistant steel Bainitic heat-resistant steel Dissimilar metal welding joint Creep damage Interfacial failure
Zhang Jianqiang Zhang Guodong He Jie Zhang Yinlin Zhang Fuju
College of Power and Mechanical Engineering, Wuhan University, 430072, P R China
国际会议
郑州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）