About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing: Materials Design and Alloy Development V – Design Fundamentals
|
Presentation Title |
Grain Refinement in Fusion Based Additive Manufacturing |
Author(s) |
Mark A. Easton, Duyao Zhang, Dong Qiu |
On-Site Speaker (Planned) |
Mark A. Easton |
Abstract Scope |
One of the less desirable aspects of fusion-based additive manufacturing is the formation of coarse columnar grain structures crossing build layers. This presentation explains the reason for the formation of columnar grain structures. Successful approaches to the grain refinement of titanium alloys using alloying elements that produce constitutional supercooling are discussed along with the difficulty with nucleant additions. Much of the grain-refining technology already used in aluminium casting is shown to also be applicable to additive manufacturing, although the novelty of the effective use of nanoparticles as nucleants is highlighted. It is also shown that for other alloy systems for which there is a lack of grain-refining technology using chemical means, mechanical means, such as ultrasonic treatment, can be effective across a wide range of alloys. Finally, the importance of understanding nucleation in solidification conditions characterized by high cooling rates and thermal gradients is considered. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Solidification, Titanium |