Influence factors and improvement methods on the porosity of 3D printing metal materials

Selective laser melting is one of the most promising 3D printing technologies in the field of fine laser rapid prototyping.However, the rapid heating and solidification in the printing process result in the defects, such as pores and cracks.To obtain the printing materials with excellent performance, the influence factors on the porosity of 3D printing metal materials prepared by selective laser melting technology were introduced in this paper, including laser power, scanning rate, ambient atmosphere, and nanometer powder composite doping.The subsequent treatments were discussed to reduce the porosity, such as heat treatment and plastic deformation.