Various techniques to control microstructures and performances have been developed to address the problems of microstructure defects

residual stress

and anisotropy in metal additive manufacturing components. Based on the recent work performed in associated with additive manufacturing assisted by ultrasonic energy field

this paper analyzes the “liquid–solid” dual effect of ultrasonic impact

and summarizes the influence of ultrasonic impact treatment on the microstructure

surface roughness

microhardness

residual stress

corrosion resistance and other properties of additive metal materials. The results show that ultrasonic energy field ensures that the internal microstructure and grain size are significantly refined

the porosity is reduced

and the corrosion resistance is improved. At the same time

the microhardness of the additive component increases

and the residual tensile stress is transformed into residual compressive stress that is beneficial to the mechanical properties of the parts.