| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
3D Characterization of Alpha Phase Morphology and Variant Selection in EBM Ti-6Al-4V |
| Author(s) |
Ryan DeMott, Phillip Liam Stephenson, Peter Collins, Nima Haghdadi, Xiaozhou Liao, Simon Ringer, Sophie Primig |
| On-Site Speaker (Planned) |
Ryan DeMott |
| Abstract Scope |
The microstructure of Ti-6Al-4V is in large part determined by alpha variant selection during the beta-to-alpha transformation. This can result in complex microstructures and significantly impact mechanical properties through the formation of macro-textured regions. The extreme thermal gradients and cyclic thermal loading in additive manufacturing processes can lead to variations in the alpha variant selection behavior and final morphology.
In this work, Ti-6Al-4V blocks were built using electron beam melting (EBM) with three different scan strategies: linear, random, and Dehoff, in order to generate different thermal histories. The microstructures were characterized using 2D and 3D EBSD and variations in alpha lath morphology, alpha variant selection, and prior and retained beta textures were observed across the three different builds. Examining these complex microstructures in 3D allows new insights into beta to alpha phase transformation and the competing mechanisms of alpha variant selection. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |