90W-7Ni-3Fe selective laser melting heat behavior analysis and experimental research

Selective laser melting is a method for forming difficult-to-machine metals. In this paper, 90W-7Ni-3Fe is taken as the research object, and the physical properties parameters of the material in the powder and solid state are considered respectively, and the finite element model of the temperature field is established to simulate the forming process. Temperature field, the melt pool size, temperature gradient, cooling rate changes under different process parameters were studied. The analysis of the temperature field shows that the temperature of the center of the melt channel exceeds the melting point of tungsten, and the powder is fully melted, while the temperature of the overlap of the melt channel only exceeds the melting point of nickel iron, and the tungsten particles are not melted. Formed by sintering. At the same time, process experiments with corresponding parameters were designed, and it was found that increasing the energy input can make the liquid phase filling more sufficient and the density of the shaped parts increased.