Abstract
ODS steels are serious candidates for fuel cladding in 4th generation nuclear fast fission and fusion reactors. Meanwhile nano-precipitation is beneficial, the presence of a coarse precipitation (mostly carbides) usually known to deteriorate mechanical properties, could be detrimental.\n In this study, two ODS ferritic steels with different carbon contents (200 ppm and 700 ppm) have been elaborated by powder metallurgy and consolidated by Hot Isostatic Pressing, in order to evaluate C-rich precipitates influence on microstructural and mechanical properties.\n Nano-precipitates analysis revealed that nano-oxides size and density were similar in low and high carbon content materials. Microstructure examination showed a bimodal grain size for both materials, with equivalent mean size. Coarse precipitation of Cr23C6 only occurred in the higher C content material with an elongated shape, located at grain boundaries. Impact toughness properties are highly degraded when C content is increased, as C-rich precipitates act as initiation sites of failure.
Published Version
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