研究目的
To assess the potentialities of additive manufacturing in nuclear industry by producing Oxide Dispersion Strengthened (ODS) Fe\14Cr steels by laser powder bed fusion (L-PBF) and studying the influence of powder characteristics on the processability.
研究成果
The study concludes that spherical powder particles allow obtaining L-PBF builds with higher densities than those made with non-spherical powder particles. Fine powder particles provide a broader L-PBF processing parameter range for obtaining dense parts. Non-spherical powders can be used in L-PBF process for energy densities above 110 J.mm?3. The chemical composition of the powder strongly influences the final microstructure of L-PBF parts, with yttrium and titanium inducing the formation of large and shallow molten pools leading to the growth of regular columnar grains along the building direction.
研究不足
The study is limited to the assessment of powder characteristics on the processability of ODS Fe\14Cr by L-PBF. The influence of other process parameters and the scalability of the process for industrial applications are not explored.
1：Experimental Design and Method Selection
The study involves the consolidation of ODS Fe\14Cr steels by L-PBF using four different powders varying in size, morphology, and chemical composition. The process parameters such as laser power, scanning speed, hatch distance, and scanning strategy are optimized to achieve dense L-PBF builds.
2：Sample Selection and Data Sources
Four different powder batches are used, differing in size, morphology, and chemical composition. The powders are characterized for density, particle size distribution, flowability, and morphology before consolidation by L-PBF.
3：List of Experimental Equipment and Materials
TruPrint series 1000 L-PBF machine equipped with a 200 W Yb-fiber laser, JEOL 7000F scanning electron microscope (SEM), Horiba? EMGA 820 AC analyser for oxygen content measurement, Partica LA-950 granulometer from Horiba?, Densitap ETD-20 from Granuloshop?, and a helium pycnometer for theoretical density measurements.
4：Experimental Procedures and Operational Workflow
The L-PBF experiments are conducted under argon atmosphere with an imposed oxygen concentration lower than 100 ppm. The powder bed feed rate is fixed to 50 μm per layer. All samples consolidated by L-PBF process are cubes of 10 mm side.
5：Data Analysis Methods
The density of each sample is measured using Archimedes' method. SEM images are obtained to observe the microstructure. Oxygen content of each powder is measured using the inert gas fusion method.
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