In this paper

the microstructure

mechanical properties at room temperature and high temperature

and the fracture morphology of dissimilar welded joints between HP-Nb M heat-resistant steel and 15CrMo steel

Cr18Ni10Ti stainless steel were analyzed by the optical microscope

electronic universal testing machine

and scanning electron microscope. The results show that the microstructure change occurs in the heat-affected zone of 15CrMo

and the ferrite-pearlite structure transforms into the ferrite-martensite structure. Much α-phase precipitates in the heat-affected zone of Cr18Ni10Ti stainless steel. The yield strength of these two welded joints is higher than the base metal

but the percentage elongation after fracture is lower. Under high temperature

higher tensile strength of these two welded joints was obtained with the increase of strain rate.