Abstract
Apparent anisotropies have been found in the mechanical properties of selective laser melted Ti–6Al–4V alloy. This study investigated the influences of the vertical and horizontal building directions on the impact toughness of selective laser melted Ti–6Al–4V, and a mechanism for the anisotropy in toughness is proposed. Disc-shaped building defects were clearly observed, even though the relative density was as high as 99.5%. The directionality of these defects reduces the load-bearing cross-section of a vertical specimen relative to that of a horizontal specimen; consequently, the impact energy of a horizontal specimen is 96% higher than that of a vertical specimen.
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