High strength-ductility matched oxide-particles dispersion steel, preparation method and application thereof

A high strength-ductility matched oxide-particles dispersion steel,

• comprising components in percentage by mass:
• chromium (Cr) 11.0-13.0%, tungsten (W) 1.0-2.0%, vanadium (V) 0.1-0.2%, yttrium (Y) 0.3-0.4%, oxygen (O) 0.05-0.15%, silicon (Si) 1.5-2.5%, carbon (C)≤0.0016%, with iron (Fe) and unavoidable impurities accounting for a rest;
• wherein a method for preparing the high strength-ductility matched oxide-particles dispersion steel comprises:
• preparing pre-alloyed powders of Cr, W, V and Fe using the components according to a proportion, then mixing with Si powder, Y powder and Y2O3 powder, followed by ball milling, sintering, forging, heat treatment and quenching, so as to obtain the high strength-ductility matched oxide-particles dispersion steel;
• wherein the forging adopts a two-step method of hot forging+warm forging, the hot forging comprises free-forging after keeping a temperature at 1,150° C. for 1 h, using an orthogonal forging method with a forging ratio of 2:1, and naturally cooling after forging;
• and the warm forging comprises forging after keeping a temperature at 800° C. for 3-5 h using an orthogonal forging method with a forging ratio of 2:1, and cooling by burying in sand after forging;
• the heat treatment is at a temperature in a range of 1,150-1,250° C. for a duration of 20 min;
• and
• the quenching is carried out under a temperature of 20° C.