|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Building the Pathway towards Process and Material Qualification
||A-18: EBSD Study of Ti-6Al-4V Alloy Fabricated by Powder-Bed Electron Beam Additive Manufacturing
||Xiaoqing Wang, Kevin Chou
|On-Site Speaker (Planned)
Powder-bed Electron Beam Additive Manufacturing (EBAM) has been explored to 3D print complex-shaped parts made of alloys such as Ti-6Al-4V. In this study, Ti-6Al-4V samples fabricated by the EBAM process with different parameter settings were investigated using electron back scattering diffraction (EBSD). It was observed that the X-plane (side surface) of the specimens show columnar prior b grains with the width in the range of 40 to 110 Ám . The b grains could grow along the build direction across multiple layers. On the other hand, the Z-plane (scanning surface) specimens exhibit more like equiaxed features in microstructure. Due to ultrafast cooling rates, the majority of the grain size is fairly small, below 10 Ám, with the primary dendrite arm space approximately on the order of Ám. The inverse pole figures from the X-plane specimens indicate that the preferred growing orientation of the most a grains was <001> due to the epitaxial growth and the major heat conduction direction. However, there are also some minor preferred orientations. As a whole, the texture distribution disperses randomly, which may enhance the mechanical properties of EBAM-made Ti-6Al-4V alloys.
||Planned: A print-only volume