Provided are a ferritic/martensitic oxide dispersion strengthened steel with increased high temperature creep resistance, including 0.02 to 0.2 wt % of carbon (C), 8 to 12 wt % of chromium (Cr), 0.1 to 0.5 wt % of yttria (Y.sub.2O.sub.3), 0.2 to 2 wt % of molybdenum (Mo), 0.01 to 0.5 wt % of titanium (Ti), 0.01 to 1 wt % of manganese (Mn), 0.01 to 0.3 wt % of vanadium (V), 0 to 0.3 wt % of zirconium (Zr), 0 to 0.5 wt % of nickel (Ni), and the remaining content of iron (Fe), and a method of manufacturing the same. The ferritic/martensitic oxide dispersion strengthened steel may be useful as a material for core structural components of a nuclear power system, ultra supercritical pressure steam generator components of a thermal power plant, or engine components of an airplane due to a high tensile strength at 700 C. and excellent creep resistance.

A method for preparing a nano spherical oxide dispersion strengthening phase using a micron oxide is proposed for the first time. First, a micron oxide is used as a raw material to prepare a nano oxide with a completely amorphous structure/matrix alloy composite powder by mechanical ball milling in stages. In the first stage, ball milling is performed, causing the oxide to break and transform in structure, and achieving nano-sizing and completely amorphization, to prepare a composite powder with a completely amorphous structure nano oxide uniformly distributed in the matrix alloy powder; and in the second stage, the composite powder obtained in the first stage and the remaining matrix alloy powder are uniformly mixed by ball milling. Then, the uniformly mixed powder is sequentially subjected to hot forming, hot rolling, and heat treatment, to obtain a nano spherical oxide dispersion strengthened alloy.

A method for preparing a nano spherical oxide dispersion strengthening phase using a micron oxide is proposed for the first time. First, a micron oxide is used as a raw material to prepare a nano oxide with a completely amorphous structure/matrix alloy composite powder by mechanical ball milling in stages. In the first stage, ball milling is performed, causing the oxide to break and transform in structure, and achieving nano-sizing and completely amorphization, to prepare a composite powder with a completely amorphous structure nano oxide uniformly distributed in the matrix alloy powder; and in the second stage, the composite powder obtained in the first stage and the remaining matrix alloy powder are uniformly mixed by ball milling. Then, the uniformly mixed powder is sequentially subjected to hot forming, hot rolling, and heat treatment, to obtain a nano spherical oxide dispersion strengthened alloy.

A method for preparing element diffusion-type composite substrate and it belongs to the field of high-temperature coated superconductor substrate preparation. The rolled composite nickel-tungsten alloy substrate is heated and thermally insulated, meanwhile, both ends of the rolled substrate are applied with a low voltage and high current density pulse current. High-performance nickel-tungsten alloy composite substrate is obtained with the method in the present invention and the sandwich-like composite substrate has low ferromagnetism and high strength due to higher solute diffusion from inner layer to outer layer, yet which does not affect the formation of sharp cubic texture on the surface of the composite substrate. On the one hand, the adoption of electric pulse technology accelerates the interdiffusion effect of inter-layer elements, on the other hand, it promotes the recrystallization nucleation and reduces the recrystallization annealing temperature of the composite substrate, thus energy saving effect is achieved and the negative effects of annealing thermal erosion grooves among crystal boundary to subsequent coating are effectively reduced. Alloy composite substrate prepared in this invention has the characteristics of high cubic texture content, low magnetism, high strength, and can be applied to large-scale industrial production.

A method for preparing element diffusion-type composite substrate and it belongs to the field of high-temperature coated superconductor substrate preparation. The rolled composite nickel-tungsten alloy substrate is heated and thermally insulated, meanwhile, both ends of the rolled substrate are applied with a low voltage and high current density pulse current. High-performance nickel-tungsten alloy composite substrate is obtained with the method in the present invention and the sandwich-like composite substrate has low ferromagnetism and high strength due to higher solute diffusion from inner layer to outer layer, yet which does not affect the formation of sharp cubic texture on the surface of the composite substrate. On the one hand, the adoption of electric pulse technology accelerates the interdiffusion effect of inter-layer elements, on the other hand, it promotes the recrystallization nucleation and reduces the recrystallization annealing temperature of the composite substrate, thus energy saving effect is achieved and the negative effects of annealing thermal erosion grooves among crystal boundary to subsequent coating are effectively reduced. Alloy composite substrate prepared in this invention has the characteristics of high cubic texture content, low magnetism, high strength, and can be applied to large-scale industrial production.

A method of forming a component from a powder metal includes forming the component to a desired shape from the powder metal, heating the component to a burnishing temperature of 900 to 1300 degrees Fahrenheit, and burnishing a surface of the component while the component is at the burnishing temperature to densify the surface.

A method of forming a component from a powder metal includes forming the component to a desired shape from the powder metal, heating the component to a burnishing temperature of 900 to 1300 degrees Fahrenheit, and burnishing a surface of the component while the component is at the burnishing temperature to densify the surface.

A method of forming a component includes heating the component to a burnishing temperature above 500 degrees Fahrenheit, and burnishing a surface of the component while the component is at the burnishing temperature to densify the surface. The burnishing process at an elevated temperature may be integrated into other processes, such as the sintering or heat treating processes.

A method of forming a component includes heating the component to a burnishing temperature above 500 degrees Fahrenheit, and burnishing a surface of the component while the component is at the burnishing temperature to densify the surface. The burnishing process at an elevated temperature may be integrated into other processes, such as the sintering or heat treating processes.

The present invention belongs to the technical field of the preparation of alloy materials, and discloses a high strength and toughness alloy material, a method for preparing the alloy material by semi-solid sintering, and application thereof. The preparation method comprises the three steps of mixing powders, preparing alloy powders by high-energy ball milling, and semi-solid sintering of alloy powders, the key point lies in the two-step sintering, wherein the temperature is heated to less than the initial melting temperature of the lowest-temperature melting peak of the alloy powder, under the sintering pressure conditions, and carried out a sintering densification treatment; after pressure release, the temperature is heated to the sintering temperature Ts, and maintained at the same temperature, and a semi-solid processing is carried out, with a sintering temperature Ts: Tsthe initial melting temperature of the lowest-temperature melting peak of the alloy powder, Tsthe initial melting temperature of the highest-temperature melting peak of the alloy powder. By using the present method, a variety of high melting point alloy systems comprising such as Ti-based, Ni-based alloy system, and the like are carried out a semi-solid processing, so as to obtain an alloy material with a novel microstructure such as nanocrystalline, ultra-fine crystalline, fine crystalline or bimodal structure, and the like, and having excellent performances, which can be widely used in the fields of aerospace, military, instruments and the like.