Research Progress on Creep Rupture Behavior of Ferritic/AusteniticSteel Welded Joints in Thermal Power Plant

The microstructure evolution, formation and propagation of type Ⅳ cracks, and creep rupture mechanism of ferritic/austenitic steel welded joints in thermal power plant during service are reviewed. The creep rupture behavior of weak position of the welded joints is emphatically analyzed. The influencing factors of creep rupture in the heat-affected zone of ferritic steel are summarized, and relevant suggestions for improving the creep performance of welded joints are given. Finally, the future research direction is prospected.