As can be seen from the above table

As can be seen from the above table and line diagram, the relative density of selective laser melting parts changes significantly with the change of laser power and scanning speed. The relative density of laser power is certain to decrease with the first increase of scanning speed, and reaches the maximum value at 600 mm/s. When the scanning speed is constant, the relative density of the laser increases with the increase of the laser power. When the relative density reaches a maximum of 99.3%, the laser power is between 190 W and 250 W, and the scanning speed is between 600 mm/s and 720 mm/s. The points corresponding to these parameters are selected to draw the relation between the linear energy density and the relative density