Defect Formation in EBM Parts Built in Horizontal Orientation
Abstract
EBM built parts in a horizontal orientation, particularly with bottom curved surfaces, are prone
to variations in dimensional accuracy and defect formation. These defects likely occur due to the
nature of the supports utilized and the build strategy. To understand the effect of support
structures and scan direction on these defects, a series of cylindrical parts were built using
different diameters, support structures and scan strategies. The as-built samples were
mechanically tested and sample cross sections were analyzed. Pore formation and balling effects
were observed in the lower section of some samples. The study looks at the effects of supports,
geometry and scan strategy on the minimization of these defects and improving the dimensional
accuracy of horizontally built samples.