Odette, "Transmission electron microscopy characterization of the nanofeatures in nanostructured ferritic alloy MA957," Acta Materialia, vol. Chen et al., "Microstructural changes and void swelling of a 12Cr ODS ferritic-martensitic alloy after high-dpa self-ion irradiation," Journal of Nuclear Materials, Article vol. Wirth, "Recent Developments in Irradiation-Resistant Steels," Annual Review of Materials Research, vol. Odette, "Recent Progress in Developing and Qualifying Nanostructured Ferritic Alloys for Advanced Fission and Fusion Applications," JOM, Article in Press 2014, doi: 10.1007/s1183-5. Maloy, "High temperature microstructural stability and recrystallization mechanisms in 14YWT alloys," Acta Materialia, vol. Aydogan et al., "Effect of tube processing methods on microstructure, mechanical properties and irradiation response of 14YWT nanostructured ferritic alloys," Acta Materialia, vol. Ramakrishna, "A review on properties of Inconel 625 and Inconel 718 fabricated using direct energy deposition," Materials Today: Proceedings, vol. Liu, "Improving creep resistance of nickel-based superalloy Inconel 718 by tailoring gamma double prime variants," Scripta Materialia, vol. This study sheds light on producing ODS IN718 alloys with high-density nano-oxides using powder metallurgy and additive manufacturing methods. The deviation in the lattice parameters of Y2Ti2O7 infers the existence of some Al in the structure. The nano-oxides are determined to be Y2Ti2O7, Y2TiO5 or YTiO3 and Y-Al-O. Similarly, SLM results in a high number density of fine nano-oxides however, the particles exist in groups with the grains/cells. It has been found that the powder metallurgy method that consists of compressing followed by sintering at 12 ☌ results in a nano-granular structure with homogenously distributed fine nano-oxides having a high number density. The effect of processing routes on the microstructure, in particular on the nano-oxide formation and structure has been investigated. In this study, ODS IN718 alloys have been produced using conventional powder metallurgy (PM) and novel selective laser melting (SLM) additive manufacturing. Oxide dispersion strengthened (ODS) Ni-based alloys having a high density of nano-oxides (NOs) (<10 nm) are considered to be good candidates for extreme environments, such as high temperature, radiation, and corrosion.
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