About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Refractory Metallic Materials
|
| Presentation Title |
Crack susceptibility of ternary tungsten alloys designed for laser powder bed fusion additive manufacturing |
| Author(s) |
Amit Kumar Singh, Priyanka Agrawal, Eric Kusterer, Rajiv S Mishra |
| On-Site Speaker (Planned) |
Amit Kumar Singh |
| Abstract Scope |
The crack susceptibility index (CSI) of ternary W-alloys offers valuable insights into the alloy compositions that are prone to cracking during laser powder bed fusion (PBF-LB) process. The formation of eutectic structures and secondary phases contributes to mitigating solidification cracking by promoting backfilling and reducing the tensile strain on cooling. In this study, the maximum CSI, defined as |dT⁄d(f_s )^(1/2)|, where T is temperature and fₛ is solid fraction, was evaluated for W-Nb-C alloy systems using Thermo-Calc database and heat transfer–material flow modeling. CSI was analytically calculated for two alloy compositions: W-10Nb-0.45C and W-10Nb-1.0C, considering both scenarios, with and without back diffusion, under varying cooling rates representative of PBF-LB conditions. Both alloys exhibit a compressive strength of ~1200 MPa at room temperature attributed to the presence of crack free and lamellar eutectic phase rich in WC and NbC. Funded by NASA #80NSSC21M0273, POC Dr. Fredrick Michael. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Modeling and Simulation, ICME |