| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Additively Manufactured Materials
|
| Presentation Title |
High Temperature Oxidation of Ni-Based Superalloy 247 Processed by Electron Beam-Powder Bed Fusion Additive Manufacturing |
| Author(s) |
Karthikeyan Hariharan, Oswaldo Luengas, Christopher H. Zenk, Sannakaisa Virtanen |
| On-Site Speaker (Planned) |
Karthikeyan Hariharan |
| Abstract Scope |
Ni-based superalloy 247 is a cast γ’-strengthened superalloy known for its excellent creep and oxidation resistance at elevated temperatures. Recently, Ni-based superalloy 247 was optimized for electron beam-powder bed fusion (EB-PBF) by mitigating crack susceptibility during processing. In this work, we assess the high-temperature oxidation behavior of EB-PBF-247 with different grain structures using isothermal oxidation tests and post-mortem characterization at 700,900 and 1100oC. The isothermal oxidation tests show that change in grain structure from hybrid columnar-equiaxed to fully columnar enhances the oxidation kinetics at 1100oC, while the effect diminishes at lower temperatures. However, the internal oxidation is well pronounced in the low mass-gain hybrid alloy in comparison to the columnar alloy, irrespective of the test temperature. The findings are discussed in terms of the nature (structure and composition) of the oxide scales, processing-induced local microstructural variations, diffusion of oxygen and alloying elements in the alloy and oxide scale. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Environmental Effects |