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Benjamin Maier,Mia Lenling,Hwasung Yeom,Greg Johnson,Stuart Maloy,Kumar Sridharan 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.4
A novel fabrication method of oxide dispersion strengthened (ODS) steel cladding tubes for advanced fastreactors has been investigated using the cold spray powder-based materials deposition process. Coldspraying has the potential advantage for rapidly fabricating ODS cladding tubes in comparison with theconventional multi-step extrusion process. A gas atomized spherical 14YWT (Fe-14%Cr, 3%W, 0.4%Ti, 0.2%Y, 0.01%O) powder was sprayed on a rotating cylindrical 6061-T6 aluminum mandrel using nitrogen asthe propellant gas. The powder lacked the oxygen content needed to precipitate the nanoclusters in ODSsteel, therefore this work was intended to serve as a proof-of-concept study to demonstrate that freestandingsteel cladding tubes with prototypical ODS composition could be manufactured using thecold spray process. The spray process produced an approximately 1-mm thick, dense 14YWT deposit onthe aluminum-alloy tube. After surface polishing of the 14YWT deposit to obtain desired claddingthickness and surface roughness, the aluminum-alloy mandrel was dissolved in an alkaline medium toleave behind a free-standing ODS tube. The as-fabricated cladding tube was annealed at 1000 C for 1 hin an argon atmosphere to improve the overall mechanical properties of the cladding