Effect of the fabricating locations and orientations according to the powder coating direction in Selective Laser Melting on mechanical properties

Abstract

The mechanical properties of Co-Cr-W-Mo alloy specimens fabricated concerning different orientations considering the powder coating direction in the Selective Laser Melting process have been investigated. In parallel, the influence of design of the powder coating component on powder particles’ alignment and compaction have been examined. The tensile specimens had been located and oriented at three different positions on the build tray. The positions had been chosen considering the start and finish lines of the powder coating process, whereas the samples oriented longitudinally, diagonally and transversely to the powder coating direction. Two different energy densities have been applied for each set of samples to observe the similarities. The position and orientation have a remarkable effect on the density, ultimate tensile strength, yield strength and elongation of the specimens. The metallurgical properties deteriorated gradually along the powder coating direction. The densification of the powder also varied along and across the powder coating direction. Eventually, the stochasticity of metallurgical properties gradually increased toward the distant regions along the powder coating direction. High stochasticity of tensile properties has present in the specimens for a particular fabricating orientation which has been observed for both fabricating energy densities.

Keywords

• Fabricating location
• Fabricating orientation
• Powder coating direction
• Tensile properties
• Selective laser melting
• Co-Cr-W-Mo alloy