Title :
On the Characteristics of Creep Damage and Rupture of Dissimilar Heat-Resistant Steel Welded Joint
Author :
Zhang Jianqiang ; Zhang Guodong ; Guo Jialin ; Luo Chuanhong ; Zhang Yinglin
Author_Institution :
Sch. of Power & Mech. Eng., Wuhan Univ., Wuhan
Abstract :
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/12Cr2MoWVTiB 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 500 h, 1000 h, 1500 h, 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.
Keywords :
arc welding; boron alloys; chromium alloys; couplings; creep fracture; creep testing; ductility; failure analysis; fracture toughness; martensitic steel; molybdenum alloys; scanning electron microscopy; steel; titanium alloys; tungsten alloys; vanadium alloys; welding; CrMoWVTiB; SA213T91; bainitic heat-resistant steel; creep damage; creep rupture strength; creep rupture test; dissimilar heat-resistant steel welded joint; ductility cracking; failure characteristics; high temperature accelerated simulation; martensitic steel; mechanical properties; pulsed argon arc welding; scanning electronic microscope; time 1000 h; time 1500 h; time 500 h; Acceleration; Argon; Creep; Electronic equipment testing; Life estimation; Mechanical factors; Scanning electron microscopy; Steel; Temperature; Welding;
Conference_Titel :
Power and Energy Engineering Conference, 2009. APPEEC 2009. Asia-Pacific
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-2486-3
Electronic_ISBN :
978-1-4244-2487-0
DOI :
10.1109/APPEEC.2009.4918554
