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Because of inferior creep strength of conventional ferritic steels at elevated temperatures, oxide-dispersion-strengthened ferritic steels were developed, by introducing nano-sized oxide particles in the ferrite matrix via a mechanical alloying (MA) procedure and subsequent hot static press (HIP) or hot extrusion procedures. Studies show that ODS ferritic steels have significantly improved creep rupture strength, high resistance to neutron irradiation and to high-concentration helium production. These merits make the ODS ferritic steels highly applicable to the cladding materials of fuel pins in fast reactors, or to structure materials of the blanket vessel in fusion reactors. Recently high-Cr ferritic ODS steels with Al addition to about 4% were developed to further improve the corrosion resistance of the materials[1]. Microstructure of the ODS ferritic steels and influence of the fine oxide particles on the accumulation of defects and helium atoms are crucial concerns for the application of the materials in advanced nuclear energy systems.
Because of inferior creep strength of conventional ferritic steels at elevated temperatures, oxide-dispersion-strengthened ferritic steels were developed, by introducing nano-sized oxide particles in the ferrite matrix via a mechanical alloying (MA) procedure and subsequent hot static press (HIP) or hot extrusion procedures. Studies show that ODS ferritic steels have significantly improved creep rupture strength, high resistance to neutron irradiation and to high-concentration helium production. These merits make the ODS ferritic steels highly applicable to the cladding materials of fuel pins in fast reactors , or to structure materials of the blanket vessel in fusion reactors. Recently High-Cr ferritic ODS steels with Al addition to about 4% were developed to further improve the corrosion resistance of the materials [1]. Microstructure of the ODS ferritic steels and influence of the fine oxide particles on the accumulation of defects and helium atoms are clear concerns for the applica tion of the materials in advanced nuclear energy systems.