About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques
|
Presentation Title |
A-36: Microstructural Development and Mechanical Properties of Selective Laser Melted Co-Cr-W Dental Alloy |
Author(s) |
Leonhard Hitzler, Jonas Von Kobylinski, Robert Lawitzki, Christian Krempaszky, Ewald Werner |
On-Site Speaker (Planned) |
Jonas Von Kobylinski |
Abstract Scope |
Dental restorations are unique and patient specific in their designs, while inhabiting complex shapes and serving multi-functional purposes. Thus, they represent a predestined area for additive manufacturing technologies such as selective laser melting. Comparing the traditional fabrication route of dental restorations via investment casting associated with notoriously slow cooling rates, the rapid solidification rates achieved in SLM lead to a fine-grained microstructure with improved mechanical properties. However, this fine-grained microstructure possesses a face-centered cubic crystal lattice structure, lowering its respective Young’s modulus when compared to the predominantly hexagonal close-packed crystal structure present in coarse-grained cast parts.
Heat-treatments proved to be a viable option to increase the elastic stiffness up to 40-50 GPa, to safely meet dental standards. The improvement in stiffness, however, is not due to the phase-transformation from fcc to hcp, but seems to be caused by a precipitate formation similar to that in Ni-base alloys after creeping. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |