Study on Selective Laser Melting Process of Fe-Ni Metal Powder

Selective laser melting(SLM) technique can be used to form a metallurgical compact entity by laser beam melting metal powder.The compactness is the pursuit of the goal of selective laser melting,also is the basis of fabricating parts.The samples of Fe-Ni metal material were prepared by SLM technique,choosing iron nickel alloy powder,under different technological parameters,laser power,scanning speed,spread powder thickness,single channel scan,multilayer single channel scan and so on.By scanning electron microscopy(SEM) and compactness testing,the microstructure and density of the samples prepared under different process parameters were contrasted.On the basis of experiment,the optimized parameters are determined and the compact block is eventually fabricated.The density ratio reaches 80%,which is in high level.