| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
A-85: Alpha Variant Selection in Additively Manufactured Ti-6Al-4V |
| Author(s) |
Philip Liam Stephenson, Ryan Demott, Nima Haghdadi, Xiaozhou Liao, Simon Ringer, Sophie Primig |
| On-Site Speaker (Planned) |
Ryan Demott |
| Abstract Scope |
Additive manufacturing (AM) is gaining interest in industry. The extreme thermal gradients and cyclic thermal loading involved result in complex and unpredictable microstructures. This is particularly true of Ti-6Al-4V due to its beta-to-alpha solid-state transformation. The preferred selection of certain alpha variants during this transformation has been well documented. This phenomenon significantly influences the mechanical properties and microstructure of titanium alloys and causes the formation of macro-textured regions. However, variant selection has rarely been studied in the context of AM.
In this work, Ti-6Al-4V blocks were fabricated using electron beam melting under three different scan strategies to generate different thermal histories. Inter-variant boundary character distributions showed considerable variant selection. Alpha and retained beta crystallographic orientation and prior beta grain boundaries provided evidence of different variant selection mechanisms. Analysis of these features can clarify the competition between modes of variant selection in determining the final microstructure. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |