| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Additively Manufactured Materials
|
| Presentation Title |
High Temperature Oxidation of an ODS NiCr Additive Manufactured Alloy |
| Author(s) |
Fernando Pedraza, A. Duval, G. Bonnet |
| On-Site Speaker (Planned) |
Fernando Pedraza |
| Abstract Scope |
Al2O3 and Y2O3 dispersed (ODS) in a NiCr alloy (Alloy 699XA) were fabricated by laser powder bed fusion (LPBF) and subsequently oxidized at 950°C for 5000 h in air. The Al2O3 dispersed material underwent parabolic oxidation rates that tended to decrease with time due to the growth of a dual chromia/alumina layer. However, increasing the oxidation time also increased the internal oxidation with further Al2O3 formation and resulted in internal nitriding deep at the core of the material. The Y2O3 dispersed counterpart underwent much greater specific mass gains related to a very significant internal oxidation and nitridation despite Y2O3 is reputed to lower oxidation. Therefore, the marked mass gains were attributed to an insufficient density. After HIPing the Y2O3 NiCr alloy, the mass gains remained high despite the partial densification of the matrix. It was derived that the Y2O3 impeded the sufficient densification of the material. |
| Proceedings Inclusion? |
Planned: |