About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Additively Manufactured Materials
|
| Presentation Title |
Microstructural Impact on High-Temperature Oxidation of LPBF-Manufactured IN625 |
| Author(s) |
Katrin Jahns, Jan-Philipp Roth, Anton Chyrkin, Dmitry Naumenko, Ulrich Krupp |
| On-Site Speaker (Planned) |
Katrin Jahns |
| Abstract Scope |
Ideally, the material properties of cast and additively manufactured components should not differ. However, surface roughness—determined by factors such as energy density and part orientation—and the microstructural anisotropy inherent to LPBF-fabricated parts can significantly affect oxidation behavior, often resulting in increased oxidation rates. This study investigates high-temperature oxidation of IN625 produced by LPBF and conventional casting under identical chemical composition and testing conditions. While oxidation kinetics and scale thickness were comparable, only LPBF samples exhibited extensive pore formation, especially in the inner oxidation zone. This is attributed to the high dislocation density and resulting Kirkendall porosity driven by dislocation pipe diffusion. Grain elongation and microdendritic structure further promote localized diffusion paths. These findings emphasize the critical role of microstructure—beyond surface condition and chemistry—in determining oxidation resistance, highlighting the need for tailored microstructural control in AM components intended for high-temperature applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Copper / Nickel / Cobalt |