TY - CONF A1 - LĂ©onard, Fabien A1 - Tammas-Williams, S. A1 - Todd, I. T1 - CT for additive manufacturing process characterisation: assessment of melt strategies on defect population N2 - Selective Electron Beam Melting (SEBM) is a promising powder bed Additive Manufacturing (AM) technique for near net-shape manufacturing of high-value titanium components. However, as with every emerging technique, the manufacturing processes can still be greatly improved and optimised. In particular, the links between AM settings and the resulting sample porosity is of great interest, as the fatigue life of SEBM parts is currently dominated by the presence of porosity. In this study, the size, volume fraction, and spatial distribution of the pores in model samples have been characterised in 3D, using X-ray Computed Tomography (CT), and correlated to the SEBM process variables. A strong relationship was found with the different beam strategies used to contour, and infill by hatching, a part section. The majority of pores were found to be small spherical gas pores, concentrated in the infill hatched region. Rarer irregular shaped pores were mostly located in the contour region and have been attributed to a lack of fusion between powder particles. T2 - Conference on Industrial Computed Tomography iCT2016 CY - Wels, Austria DA - 09.02.2016 KW - Titanium KW - Additive Manufacture KW - Selective Electron Beam Melting KW - Pores KW - Defects KW - X-ray Computed Tomography PY - 2016 AN - OPUS4-39186 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -