Structure and Creep of Stainless Steels Dispersion-Strengthened with Yttrium Oxides

摘要

It is shown that the high strength (#sigma#_(0.2)=1272 MPa) of mechanically alloyed ODS steels annealed at 1100 deg C with a structure of polygonized ferrite is due to the high density of dislocations and dispersed Y_2TiO_5 oxide particles with an average size of about 2-3 nm. The ODS steels have a considerably higher creep resistance and rupture strength at increased stresses (150-450 MPa) and temperatures (600-700 deg C) in comparison with the conventional Kh16N15M3TF and 12Kh13M2BRF radiation-resistant reactor steels.