Microstructural optimization upgraded corrosion resistance in lead–bismuth eutectic on additive manufactured FeCrAl alloy with Y2O3 incorporation
Source abstract
Abstract
Developing high corrosion resistant alloy used in liquid lead–bismuth eutectic (LBE) is essential for the application of lead-cooled fast reactor. In this work, two laser powder bed fusion (LPBF) fabricated FeCrAl alloys and one hot-rolled FeCrAl alloy were developed, and their corrosion behavior in LBE at 500 ℃ up to 1000 h was systematically examined. The results demonstrate that high-density grain boundaries and dislocations, along with the strong <0 0 1> textured structure, significantly enhance the corrosion resistance of the LPBF-fabricated alloys. Moreover, adding Y 2 O 3 nanoparticles (ODS-FeCrAl) promotes the nucleation of intragranular oxides and accelerates intragranular diffusion by pinning dislocations and low-angle grain boundaries. Analysis suggest that such microstructural optimization facilitate a balance between intergranular and intragranular oxidation, and thus the protective oxide layer achieves strengthened integrity and continuity. This research establishes a theoretical foundation for designing nano-oxide incorporated alloys used in nuclear reactor via additive manufacturing.
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Research context
OpenAlex topics: High-Temperature Coating Behaviors · High Entropy Alloys Studies · Intermetallics and Advanced Alloy Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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