31results about How to "Uniformly distributed refinement" patented technology

The invention discloses an Ausferrite ductile cast iron grinding ball, and relates to a spherulitic graphite-contained cast iron alloy. The Ausferrite ductile cast iron grinding ball comprises the following chemical elements in percentage by mass: 3.3-3.7% of C, 2.0-3.0% of Si, 1.0-2.5% of Mn, 0.7-3.0% of Cr, 0.1-1.0% of Mo, 0.1-1.0% of Cu, 0.04-0.08% of P, 0.01-0.020% of S, 0.03-0.05% of Mg, 0.02-0.04% of Ce, 0.03-0.07% of B, 0.06-0.12% of Ti, 0.03-0.2% of V, and the balance of Fe. The Ausferrite ductile cast iron grinding ball is prepared by the steps of preparation and smelting of raw materials, spheroidizing treatment, inoculation treatment and microalloying treatment, and isothermal quenching heat treatment. The Ausferrite ductile cast iron grinding ball overcomes the defects of low production efficiency and high consumption of electric energy of a ball mill due to easy surface stripping and crushing and shorter fatigue life of an existing grinding ball product in the service process.

The invention discloses a preparation method of a gradient functional material based on friction-stir welding. The preparation method comprises the following steps: adding a reinforced phase materialto a substrate by means of a right-angled triangular prism groove structural design on the substrate; and generating heat by mutual friction of a stirring head and a material in a substrate welding region, wherein the substrate welding region is softened plastically and the material in the substrate welding region drives the reinforced phase material to flow plastically under the action of the stirring head, so as to form a uniform gradient functional material from the material in the substrate welding region and the reinforced phase material. The method disclosed by the invention does not need special environments such as vacuum, temperature, electric field and magnetic field, and is low in preparation cost; by means of a solid state processing mode, formation of cracks, pores and oxidesin the material can be avoided effectively, and the gradient functional material which is high in compactness and uniform to mix can be obtained. Various types of gradient functional materials can beprocessed; the preparation method is a green processing technology, and the gradient functional material which is higher in mechanical property can be obtained.

The invention relates to surface treatment of aluminum alloys, in particular to a wear-resisting and anti-corrosion surface treatment method used for an aluminum alloy component, specifically a micro-arc oxidation process method for pre-treating an aluminum alloy based on solution and aging. A micro-arc oxidation technology is adopted for the aluminum alloy component to prepare a wear-resisting and anti-corrosion ceramic layer on an aluminum alloy surface. The micro-arc oxidation process method comprises the following steps: carrying out solution treatment, carrying out ageing treatment, grinding, polishing and carrying out micro-arc oxidation treatment; and after carrying out the micro-arc oxidation treatment, obtaining the ceramic layer which is 80-90 [mu]m in thickness. The micro-arc oxidization ceramic layer prepared by the process method is relatively large in thickness and relatively short in preparation time; the process method has the characteristics of being simple and convenient in process, low in cost, green and environmentally-friendly, high in ceramic layer binding force, suitable for mass production and the like, and can improve the wear resistance and the corrosion resistance of the aluminum alloy surface.

The invention belongs to the technical field of metal material manufacturing, and particularly relates to a thorium tungsten wire used for winding a microwave oven magnetron and a manufacturing method of the thorium tungsten wire. The thorium tungsten wire is characterized by comprising 0.5-1.5% of thorium oxide, 0.0020-0.0080% of potassium and 97-98% of tungsten. Compared with the prior art, the thorium tungsten wire and the manufacturing method have the advantages that (1) according to the thorium tungsten wire, though 0.0020-0.0080% of the potassium is added, thorium oxide particles are still fine and uniform; (2) the thorium tungsten wire contains microelement potassium in content, after coils of the microwave oven magnetron wound through the thorium tungsten wire are carbonized at a high temperature, crystal grains cannot grow larger easily, organization stability is maintained, and the situation that the microwave oven magnetron cannot break due to shaking in the packaging and delivery transportation processes after being produced is guaranteed.

The invention relates to the field of seamless steel pipes, in particular to a stainless steel seamless pipe and a preparation method and application thereof.The preparation method comprises the following steps that cold drawing is conducted on a pipe in a small-deformation mode, a medium-deformation mode and a large-deformation mode respectively, and solid solution heat treatment needs to be conducted on the pipe after cold drawing is finished every time; and finally, the stainless steel seamless tube with the uniform internal grain structure size is obtained. According to the method, the grain structure in the stainless steel seamless tube is refined and uniformly distributed in a mode of combining different deformation amounts with heat treatment, and finally, a uniform structure with the grain size of 4-6 levels and the level difference smaller than 2 levels is achieved. Meanwhile, by adopting the manufacturing process, the large-diameter stainless steel seamless steel which is uniform in grain structure distribution, larger than 800mm in pipe outer diameter and larger than 10mm in wall thickness can be manufactured, and the large-diameter stainless steel seamless steel pipe can be used for a main pipeline system of an advanced nuclear power station.

The invention discloses a preparation method for semi-high speed steel. The method includes the steps of (1) smelting, (2) forging and rolling, (3) annealing, (4) simultaneous copper brazing and quenching, and (5) tempering. In the step of smelting, smelting is conducted through an electric induction furnace, or electroslag remelting is conducted after smelting through the electric induction furnace; the semi-high speed shear steel is composed of, by weight percentage, 0.56%-0.65% of C, 0.40%-0.60% of Si, 0.25%-0.40% of Mn, 6.0%-6.8% of Cr, 1.6%-2.5% of W, 4.2%-5.2% of Mo, 0.7%-0.9% of V, 0.1%-0.2% of Nb, 0.3%-0.4% of Co or Ni, 0-0.02% of S, 0-0.025% of P, and the balance Fe. The hardness of a paper cutting blade made of the semi-high speed steel is identical with that of an original paper cutting blade which is manufactured through copper brazing and high-speed steel inlaying, but the sharpness is higher, blade sharpening is easy, and material cost and process cost are reduced.

The invention discloses a precision forging forming process of a torque elastomer for a 330 MPa-grade motor torque sensor. A steel material is subjected to four times of spheroidizing annealing, watercooling and oil cooling are combined, refining and uniform distribution of steel material grains are facilitated, meanwhile, the heating and cooling speed in heat treatment is controlled, the problems of fine surface layer grains and a thick middle structure of a finished product of a torque elastomer precision forging are solved, the surface layer grains are refined, lattice distortion and dislocation density are reduced, the high-temperature friction, wear resistance, hardness and surface strength of the finished product of the precision forging are greatly improved, the wear rate is greatly reduced, and the service life of the torque elastomer is effectively prolonged.

The invention relates to a preparation method of an Mg-Al-Zn-Mn-Gd corrosion resistant rare earth magnesium alloy. The method comprises the following steps of putting an alloy of Mg-Al-Zn-Mn series into a crucible with a furnace temperature of 760-780 DEG C, heating until melting, adding a small block-shaped Mg-20% Gd intermediate alloy wrapped witth aluminum-foil paper, and preserving heat for 10-15 minutes until the alloy is completely melted; then stretching an ultrasonic amplitude transformer into above alloy melt to perform intermittent ultrasonic treatment at the intensity of 2,000-3,000w for 5-10 seconds each time every other 5-10 seconds, wherein time amounts to 300-500 seconds; finally pouring the alloy melt in a preheated metal mold to obtain the Mg-Al-Zn-Mn-Gd corrosion resistant rare earth magnesium alloy. The fine second-phase tissue of the alloy provided by the invention is more uniformly distributed, and meanwhile, the addition of rare earth elements forms a cathode phase of which the self corrosion potential is low, so that all the properties of the alloy are remarkably improved.

The invention provides a method for reinforcing an aluminum alloy profile through a nano composite material. Al2O3 and carbon nanotubes in a specific proportion are dispersed under the assistance of microwave ball milling; after the nano composite material is formed, 1/2 of the nano composite material is mixed with aluminum alloy liquid, the dispersity among components and the uniformity of particle mixing are improved advantageously, and the specific surface area of mixing and the surface interaction force of mixing can be effectively increased. Finally, the remaining 1/2 of the nano composite material is added in a filling mode after aluminum alloy is sintered, the combination degree of the nano composite material and the aluminum alloy is reinforced through repeated heating and friction, refining and uniform distribution of crystal grains are further promoted, the crystal boundary stability is improved synergistically, the high strength and plasticity of the aluminum alloy are ensured, and the wear resistance of the aluminum alloy can further be improved significantly. The method for reinforcing the aluminum alloy profile through the nano composite material solves the internal defects of the nano composite material in the aluminum alloy on the whole, and solves the problem of coarse crystal grains of the aluminum alloy.

The invention discloses a powder metallurgy material for an endophytic oxide strengthening alloy and a preparation method of the powder metallurgy material. The oxide strengthening alloy is directly prepared by utilizing the crushing effect of a powder forging process on an oxide film. Oxide is refined to be combined with a matrix at a crushing position of the oxide film, oxidation products are transferred into crystalline grain and are evenly distributed, the oxide film is well combined with the matrix, and an alloy material is further densified through thermal processing, and the prepared alloy has excellent properties such as high strength and good plasticity. The method requires no extra alloy element, and therefore the cost is low. Pre-oxidation treatment can be carried out on a largebatch of products at the same time without being limited by the load output capability of traditional vacuum hot-pressing sintering. The production process is simple. Requirements for production environment are low. The formed oxide is well combined with the matrix. Large-scale production is facilitated.

The invention discloses a process for producing and machining an ausferrite nodular cast iron lining plate. The process comprises the following steps that raw materials are placed into a melting furnace to be heated till being completely molten, and the raw materials are molten into ausferrite nodular cast iron base iron melt and discharged from a furnace, wherein the base iron melt comprises, byweight, 2.8-3.4% of C, 2-2.6% of Si, 0.6-1.2% of Mn, 0.2-0.8% of Cr, 0.2-0.6% of Mo, 0.08-0.12% of B, 0.02-0.08% of Ti, 0.01-0.08% of V, 0.01-0.04% of P, 0.01-0.04% of S, 0.01-0.04% of Mg and the balance Fe; and the base iron melt is subjected to spheroidizing treatment, inoculation treatment and microalloying treatment in sequence, poured into a sand-coated metal mold, heated, insulated, quenchedinto a nitrate solution, placed for standing, and cooled to room temperature to obtain the ausferrite nodular cast iron lining plate. The process is simple, the cost is low, the product is good in wear resistance and not likely to be fractured, the volume hardness HRC can reach 61.42, the impact toughness can reach 9.12J/cm<2>, and the falling body impact fatigue life can reach 15000 times.

The invention provides a regulation and control method for ordered precipitation of a precipitated phase of aluminum-lithium alloy in laser additive manufacturing. The regulation and control method for ordered precipitation of the precipitated phase of aluminum-lithium alloy in laser additive manufacturing comprises the following steps of: feeding an aluminum-lithium alloy material into a molten pool for printing layer by layer to form a printing layer; performing rolling deformation on each formed printing layer during layer-by-layer printing, regulating and controlling the distribution of the precipitated phase by controlling the deformation amount, and then printing the next layer until printing forming of the whole aluminum-lithium alloy workpiece is completed, wherein the deformation amount of each printing layer is 7%-9% large deformation amount; and performing solid solution aging treatment on the printed and formed aluminum-lithium alloy workpiece. According to the invention, the metal material is controlled to be printed layer by layer, and synchronously, large-deformation-amount rolling deformation is carried out on each layer of the Al-Li alloy, so that ordered precipitation of the precipitated phase is controlled, and intragranular reinforced phases are not gathered at the grain boundary position and arranged disorderly any more; and a T1 phase and a [theta]' phase are precipitated at the intragranular dislocation position, the grain size of the T1 phase is reduced, grain refinement and uniform distribution are promoted, and the comprehensive performance is improved.

The invention discloses semi-high-speed shear steel. The semi-high-speed shear steel is composed of following chemical elements including, by weight, 0.66-0.7% of C, 0.35-0.5% of Si, 0.3-0.42% of Mn, 5.5-7% of Cr, 1.5-2.7% of W, 4.5-5% of Mo, 1-1.2% of V, 0.13-0.21% of Nb, 0.5-0.55% of Co, 0-0.01% of S, 0-0.02% of P, and the balance Fe. A copper-brazed steel-inlaid paper cutting blade prepared from the semi-high-speed shear steel has the same hardness as an original copper-brazed steel-inlaid paper cutting blade prepared from high-speed steel, but is higher in sharpness and easy to sharpen. Besides, material cost and process cost are reduced.

The invention discloses semi-high-speed steel. The semi-high-speed steel is composed of, by weight, 0.56%-0.65% of C, 0.40%-0.60% of Si, 0.25%-0.40% of Mn, 6.0%-6.8% of Cr, 1.6%-2.5% of W, 4.2%-5.2% of Mo, 0.7%-0.9% of V, 0.1%-0.2% of Nb, 0.3%-0.4% of Co, 0-0.02% of S, 0-0.025% of P, and the balance Fe. The strength of a paper cutting blade made from the semi-high-speed steel is identical with that of an original high-speed steel copper brazing steel plated paper cutting blade, but the paper cutting blade made from the semi-high-speed steel is higher in sharpness and easy to sharpen, and the material cost and process cost are reduced.