|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Titanium Technology
||Using Defects to Inform on Physical Phenomena in EBM Ti-6Al-4V Across Scanning Strategies
||Katie O'Donnell, Maria Jose Quintana, Matthew J. Kenney, Peter C. Collins
|On-Site Speaker (Planned)
The manufacture of structurally sound parts through additive manufacturing is usually achieved by reducing or avoiding defects during manufacture or post-processing heat treatments. However, defects can be used to study the physical mechanisms at play during additive manufacturing processes. Examining regions around defects in Ti-6Al-4V samples from across three different EBM scan strategies, using compositional, crystallographic, and microstructural characterization methods, have revealed information not only about defect formation mechanisms, but also residual stresses present in the build, fluid flow dynamics within melt pools before solidification, preferential vaporization of select elements, and grain growth. The free surfaces of both spherical pores and lack-of-fusion defects can also provide information on solid-state phase transitions and the timelines of defect formation. Spot-melting techniques specifically resulted in fewer overall spherical pores, as well as smaller spherical pores, leading toward techniques that might help mitigate the formation of these pores in future builds.
||Titanium, Additive Manufacturing, Other