3D-printed metal superalloys contain a hidden, interconnected web of alumina that makes the material breathe and corrode differently than cast metal.
Electron beam powder bed fusion creates a unique 3D internal oxide network inside Ni-based superalloys. This interconnected structure does not exist in traditionally manufactured versions of the same material. Engineering teams previously relied on 2D surface analysis to understand how these metals would break down over time. The discovery of this internal web means that the metal's internal chemistry is far more complex than a simple solid block. This finding will help engineers build more durable jet engines and power turbines by accounting for this invisible 3D skeleton. It proves that the 3D printing process changes the very nature of the metal it creates.
Anomalous 3D internal oxide network formation in Ni-based superalloy 247 processed by electron beam powder bed fusion additive manufacturing
SSRN · 6730492
Using FIB–SEM tomography, we reveal an anomalous three-dimensional internal alumina network that forms during high-temperature oxidation (1100 °C) of an electron-beam powder bed fusion (PBF-EB) Ni-based superalloy 247. This network develops beneath the external scale and preferentially forms around an interconnected skeleton of refined carbides. While conventional 2D cross-sections suggest isolated oxide–carbide co-precipitates, three-dimensional reconstructions show that all internal oxides are