Experimental and computational analyses on fatigue fracture and microstructure in dissimilar metal weldments with circular sharp stress raiser

•There are great differences in strength of up to 69.6% according to the weld states.•The weld metals have the martensite-ferrite or the austenite-ferrite mixed phase.•The fatigue cracks propagate at nearly right angle to the maximum stress direction.•The opening or mixed fracture mode is in accordance with the weld and notch shapes.•Most of samples reach fatigue failure in the same level of stress intensity factors.