About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing: Materials Design and Alloy Development IV: Rapid Development
|
Presentation Title |
Design and Development of New Titanium Metastable Alloys for Use in Laser Powder Bed Fusion |
Author(s) |
Zou Zhiyi, Minh-Son Pham, Adam Clare , James Murray, Marco Simonelli |
On-Site Speaker (Planned) |
Marco Simonelli |
Abstract Scope |
In this study we present a new strategy to design and develop low-cost titanium metastable alloys for use in Laser Powder Bed Fusion (L-PBF). The work illustrates a computational methodology that integrates CALPHAD and empirical relationships to determine the stability of the β phase within a Ti-Sn-Cr system. We show how the methodology can be used to identify compositions that retain a full metastable β phase whilst minimising crack susceptibility. The predicted microstructural pathways are then validated by characterising the structure of buttons of corresponding alloys (derived from elemental shots) after re-melting with a L-PBF apparatus. This methodology allowed to isolate a low-cost Ti-7.5Cr-4Sn alloy which was prepared in powder format. Preliminary L-PBF experiments show the possibility to fabricate fully dense specimens that maintain strain-transformable attributes and a excellent strength-ductility relationship. Findings support a new strategy for the rapid development of new advanced titanium alloys for use in L-PBF. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Titanium, Phase Transformations |