Next Generation High-Temperature Alloy: Feo-Enhanced ODS Inconel 939 Via Selective Laser Melting

Date

2026-2

Author

Aktaş, Aylin

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Inconel 939, a nickel-based alloy, is commonly utilized in the aerospace and energy sectors due to its high-temperature mechanical properties and oxidation resistance. However, the current service temperature is limited to approximately 850 °C. To extend its performance in more demanding environments, oxide dispersion strengthening (ODS) and additive manufacturing techniques have been explored. In this study, a new ODS Inconel 939 alloy, containing 0.2 wt% Y2O3, 0.15 wt% FeO, and 0.35 wt% Hf, was fabricated via selective laser melting (SLM), following a systematic optimization of ball milling and processing parameters. The process aimed to refine melt pool dimensions, promote γ' (Ni₃Al(Ti)) phase formation, and minimize residual porosity. Four different heat treatments, containing solutionizing and aging, and hot isostatic pressing (HIP), have been applied to samples manufactured with optimum parameters set. The samples were characterized using SEM, EBSD, and TEM analyses, hardness, high-temperature tensile testing, and oxidation testing. TEM revealed the presence of uniformly distributed nano-oxides, which contributed significantly to an enhancement in yield strength compared to standard Inconel 939. These findings highlight the potential of combining nanoparticle reinforcement with additive manufacturing to improve the hightemperature capabilities of IN939.

Subject Keywords

Extreme Application, Oxide Dispersion Strengthening, Hot Isostatic Pressing, Mechanical Properties, Inconel939

URI

https://hdl.handle.net/11511/119052

Collections

Graduate School of Natural and Applied Sciences, Thesis