| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Additively Manufactured Materials
|
| Presentation Title |
Oxidation of Al/Si-Coated Additive Manufactured 699XA Alloy |
| Author(s) |
Antoine Duval, G. Bonnet, Fernando Pedraza |
| On-Site Speaker (Planned) |
Antoine Duval |
| Abstract Scope |
Many additive manufactured metal alloys exhibit internal oxidation and nitridation at high temperatures in air due to the metallurgical defects resulting from the fabrication process. In this work, a dense Ni-based Alloy 699 XA fabricated by laser powder bed fusion was coated with an Al/Si slurry coating and subsequently oxidized at 950°C for 2000 h in air. The coating fostered the formation of protective Al2O3 at the top of the coating and markedly decreased the oxidation kinetics and the internal oxidation and nitridation of the alloy. However, some internal oxidation of the coating occurred. It appears that the initial metallurgy of the parent alloy creates sufficient defects through which internal oxidation and nitridation occurred. These detrimental effects were not observed on the relatively short exposures where the â-NiAl coating matrix has not yet transformed into the ã´-Ni3Al in line with the greater solubility of oxygen and nitrogen of the latter. |
| Proceedings Inclusion? |
Planned: |