| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
A-95: Direct Laser Metal Deposition of René 108 Single Crystal |
| Author(s) |
Praveen Sreeramagiri, Ajay Bhagavatam, Husam Alrehaili, Guru Dinda |
| On-Site Speaker (Planned) |
Ajay Bhagavatam, Husam Alrehaili |
| Abstract Scope |
Single crystal Ni-based superalloys are currently the materials of choice for the hottest and most severely stressed parts in gas turbines and aero engines. This paper reports a processing strategy of direct laser metal deposition of René 108 single crystal by effectively controlling the process parameters and cooling rate. The as-deposited specimen exhibited a single grain throughout the volume with the <100> growth direction. Microstructural investigation of the as-deposited sample revealed the presence of spherical γ' with an average size of 46 nm in the dendrite core and eutectic phases of γ/γ'/MC along the inter-dendritic boundaries. Heat treatment of the sample revealed a trimodal distribution of γ' precipitates with an average size of 271 nm cuboidal, 58 nm spherical γ', and rafted γ'. XRD investigation of the heat-treated sample revealed a shift in lattice parameter from 358 pm to 351 pm as a result of rafting and strain relief. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |