Effect of Hatch Spacing on Density of AlSi10Mg Alloy Fabricated by Selective Laser Melting
On the basis of stability of molten pool,a reasonable range of laser power and scanning speed is determined by single-track SLM experiments of AlSi10Mg alloy,which is 150-180 W,600-1200 mm/s,respectively.Two parameter groups of 180 W,800 mm/s and 170 W,600 mm/s were used for the multi-pass multi-layer SLM tests,the influence of the hatch spacing in 0.05-0.16 mm on the density of the alloy was studied.The results show that the density increases first and then decreases with the increase of hatch spacing.Too small hatch spacing can produce spheroidized particles,which deteriorates the density.When the hatch spacing is too big,unmelted powders exsit in the overlapping zone of the molten pools,which decreases the density.When the tensile direction is perpendicular to the scanning direction,the tensile strength and elongation of the alloy slightly increase with the decrease of the hatch spacing,and the tensile properties of the alloy are better than those with the tensile direction parallel to the scanning direction.
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