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The tensile properties of the selective laser melting (SLM) 3D printing AlSi10Mg samples were investigated which were prepared by the different forming processes, raw powders, and heat treatments. The influencing factors on the tensile properties of SLM 3D printing AlSi10Mg samples were discussed in this paper, including 3D printing forming process, powder physical properties, and heat treatment system. The results show that, the laser energy density affects the relative density of the AlSi10Mg samples, which influences the tensile properties deeply. The holes are mostly distributed at the junction and on the bottom of molten pool when the laser energy density is low, and the over high energy density leads to the distribution of pores inside the molten pool. The AlSi10Mg samples prepared using the powders with high sphericity can achieve the better tensile properties due to the good physical properties and low hollow powder ratio. The Si phase coarsens gradually as the annealing temperature increases from 270 ℃ to 300 ℃, leading to the decrease of strength and the increase of elongation gradually.

Abstract: We have prepared spherical Ti–6Al–4V (TC4) alloy powder by radio frequency (RF) plasma with irregular TC4 powder for obtaining the stable suspension slurry. The results showed that fine spherical powders with smooth surface and favorable dispersion were obtained and the spheroidization efficiency of spherical powders was almost 100%. The solid loading of TC4 slurry using spherical powders was greatly improved to 63 vol.% compared to that 40 vol.% using irregular powder, at which viscosity of the suspension slurry is lower than 1 Paás. The green bodies with bending strength of 20MPa had a smooth surface. [Copyright &y& Elsevier]