320 results about "Superplasticity" patented technology

A new class of light or reactive elements and monophase alpha'-matrix magnesium- and aluminum-based alloys with superior engineering properties, for the latter being based on a homogeneous solute distribution or a corrosion-resistant and metallic shiny surface withstanding aqueous and saline environments and resulting from the control during synthesis of atomic structure over microstructure to net shape of the final product, said alpha'-matrix being retained upon conversion into a cast or wrought form. The manufacture of the materials relies on the control of deposition temperature and in-vacuum consolidation during vapor deposition, on maximized heat transfer or casting pressure during all-liquid processing and on controlled friction and shock power during solid state alloying using a mechanical milling technique. The alloy synthesis is followed by extrusion, rolling, forging, drawing and superplastic forming for which the conditions of mechanical working, thermal exposure and time to transfer corresponding metastable alpha'-matrix phases and microstructure into product form depend on thermal stability and transformation behavior at higher temperatures of said light alloy as well as on the defects inherent to a specific alloy synthesis employed. Alloying additions to the resulting alpha'-monophase matrix include 0.1 to 40 wt. % metalloids or light rare earth or early transition or simple or heavy rare earth metals or a combination thereof. The eventually more complex light alloys are designed to retain the low density and to improve damage tolerance of corresponding base metals and may include an artificial aging upon thermomechanical processing with or without solid solution heat and quench and annealing treatment for a controlled volume fraction and size of solid state precipitates to reinforce alloy film, layer or bulk and resulting surface qualities. Novel processes are employed to spur production and productivity for the new materials.

A titanium material production method for producing homogeneous fine grain titanium material in which the titanium material has a grain size in a range from about 5 μm to about 20 μm. The method comprises providing a titanium material blank; conducting a first heat treatment on the titanium material blank to heat the titanium material blank to a β-range; quenching the titanium material blank from the β-region to the α+β-region; forging the titanium material blank; and conducting a second heat treatment on the titanium material blank. The titanium material production method subjects the titanium material blank to superplasticity conditions during part of the titanium material production method.

Solid state processing is performed on a workpiece by using a tool capable of friction stir processing, friction stir mixing, or friction stir welding, wherein solid state processing modifies characteristics of a workpiece while substantially maintaining a solid phase in some embodiments, allowing some elements to pass through a liquid phase in other embodiments, and wherein modified characteristics of the material include, but are not limited to, microstructure, macrostructure, toughness, hardness, grain boundaries, grain size, the distribution of phases, ductility, superplasticity, change in nucleation site densities, compressibility, expandability, coefficient of friction, abrasion resistance, corrosion resistance, fatigue resistance, magnetic properties, strength, radiation absorption, and thermal conductivity.

A method of superplastic forming of titanium packs and an associated assembly is provided. The titanium packs can include sheets having different granular structures so that the different sheets are adapted to superplastically form at different temperatures. One or more of the sheets can be formed at a temperature that is below the superplastic forming temperature of another sheet in the pack. In some cases, the occurrence of markoff can be reduced or eliminated.

A superplastic die forging apparatus for forming precise non-crystal alloy part is composed of vacuum heater, exchangeable pressing head consisting of internal and external pressing heads, slide block and jointer, and die comprising main body and ejector. Its technology features that the blank and die must at first be heated in the vacuum heater by defined parameters. Its advantage is high precision and surface finish quality.

The invention relates to a method for preparing a magnesium alloy section through continuous angle rotation shearing, extrusion and shaping and a mould. The method comprises the following steps: (1) a magnesium alloy blank material is subjected to homogenization treatment; (2) a mould of an extrusion mould with a plurality of angle rotation and molding is preheated; and the inside of a mould passage is evenly coated with lube; (3) an extrusion cylinder is heated to a temperature of between 175 and 325 DEG C; and (4) the homogenized blank material is heated to a temperature of between 200 and 350 DEG C; the extrusion ratio of the extrusion mould is between 4 and 100; and the magnesium alloy blank material is subjected to unidirectional extrusion at an extrusion speed of between 3 and 6 m/min so that the magnesium alloy blank material is subjected to compression and extrusion with high extrusion ratio and equal passage extrusion with a plurality of angle rotation. The magnesium alloy material prepared through the method has an ultrafine crystal grain structure, has the advantages of substantially improving the plasticity, low temperature superplasticity and high strain speed of the magnesium alloy material and has high yield stress.

The present invention relates to a superplastic forming method for the titanium plate specially used for the plate type heat exchanger, which belongs to the field of mechanical processing technology. The present invention comprises the following steps that spongy titanium is chosen to be the melted raw material; the spongy titanium is placed in a vacuum plasma smelting furnace to be directly cast into plate base; the plate base forms a plate of a thickness of 2.0 to 2.4 mm after the process of heating, hot rolling, acid and alkali washing; second heating, hot rolling and acid and alkali washing and annealing; the plate of a thickness of 2.0 to 2.4 mm after the annealing in the vacuum smelting furnace forms a titanium plate of a thickness of 0.5 to 0.6 mm after the process of cold rolling, cleaning, second annealing and cold rolling, acid and alkali washing and third annealing. The present invention adopts the process that the spongy titanium which contains oxygen, iron and nitrogen of comparatively high content is directly processed into the titanium plate base in the plasma smelting furnace and directly rolled into the plate without forging and pressing.

A method of producing a clad sheet article having superplastic properties, and the resulting clad sheet article. The method involves producing a cladding layer onto at least one rolling face of a core ingot made of a metal having superplastic properties, preferably by co-casting, to form a clad ingot and then rolling said clad ingot to produce a sheet article. The core ingot includes an element that diffuses from an interior of the ingot to a surface at superplastic forming temperatures thereby deteriorating surface properties of the ingot. The cladding layer is provided with an element (dopant) that reacts with the element of the core to reduce the ability of the element to diffuse through the cladding layer.

The invention discloses a high-strength steel with low yield ratio, high plasticity and ultra-fine grain and a manufacturing method. The chemical composition weight percentage of steel is: C: 0.06~0.09%, Si: 0.15~0.25%, Mn: 1.20~1.50%, P: ≤0.015%, S: ≤0.005%, Nb: 0.020~0.040%, V: 0.010~0.030%, Ti: 0.008~0.015%, Cr: 0.10~0.30%, Ni: 0.10~0.30%, Cu: 0.10~0.30%, Al: 0.010~0.050%, and the balance is Fe and unavoidable impurities. The invention obtains the bainite structure by adopting the controlled rolling and controlled cooling process. Through the heat treatment process, an ultra-fine grain structure with bimodal distribution is obtained, which makes the material have characteristics such as low yield ratio, superplasticity, and high strength. The production process is stable, the operability is strong, the cost is low, and the comprehensive performance of the obtained material is excellent.

The invention discloses a superplastic forming device with auxiliary of electrical pulse and a method thereof, which relate to the technical field of superplastic air bulking forming and solve the defect of low energy utilization. An upper mould and a lower mould of the device are respectively positioned at the upper side and the lower side of the blank to be formed, a forming part is placed inside a cavity of the mould, a pressure head tightly presses an insulation mould and the blank to be formed in a way of sealing, an air outlet of an air pressure device penetrates the pressure head and the insulation mould and is arranged inside the cavity; and a high frequency pulse power source, a blank holding electrode and the blank to be formed form an electrifying loop. The steps for applying the device are as follows: firstly, according to the cross sectional dimension of the blank to be formed and resistance data, a current parameter is chosen so as to lead the blank to be formed to be heated to the superplastic forming temperature, and the heating speed can be up to 50-100 DEG C per second; secondly, the edge-pressing force of a press ram is regulated, inert gas is introduced into the cavity by the pressure device so as to lead the blank to occur superplastic deformation. Applied in the complex parts manufacturing industry, the invention greatly improves the utilization of the manufacturing energy and the efficiency of heating.

The invention discloses a difficultly-deformed nickel-based superalloy superplastic forming method, relates to a difficultly-deformed nickel-based superalloy superplastic forming technique, and aims to solve the problems that during conventional preparation of the difficultly-deformed nickel-based superalloy with high strengthening phase content, the forming process is difficult, the deformation resistance is high, the difficultly-deformed nickel-based superalloy is easy to crack and difficult to recrystall. The difficultly-deformed nickel-based superalloy superplastic forming method is implemented by the following steps: 1, forging under an isothermal condition; 2, performing sub-solution temperature deformation; and 3, controlling the strain rate in a range of 0.0001-0.005/s. By the difficultly-deformed nickel-based superalloy superplastic forming method, the thermal deformation of the difficultly-deformed superalloy is easier, thereby achieving superplastic forming; the difficultly-deformed nickel-based superalloy superplastic forming method is applicable to preparation of nickel-based superalloy turbine disk in the aerospace field and preparation of other high-temperature-resistant forged disks used in a high-temperature environment.

The invention provides a preparation method of a 650 DEG C high-temperature titanium alloy sheet for superplastic forming. The preparation method adopts hot rolling machining to obtain 650 DEG C titanium alloy sheets with excellent superplastic properties. The preparation method comprises the steps that (1) after a 650 DEG C titanium alloy casting ingot is heated, cogging and forging are carried out, and a sheet blank for titanium alloy rolling is obtained; (2) after the obtained sheet blank is coated with a coating and is heated, cogging and rolling are carried out on a rolling machine; (3) after the sheet blank is heated, second rolling is carried out; (4) after the sheet blank is subjected to heat treatment above the beta phase transformation point, rapid water quenching cooling is carried out; (5) after the sheet blank is heated, third hot rolling is carried out; (6) after the sheet blank is heated, fourth reversing hot rolling is carried out; (7) the obtained blank is assembled and welded, and a coated overlapping rolling package is obtained; (8) after the overlapping rolling package is heated, hot rolling is carried out, and a semi-finished sheet is obtained; and (9) after the semi-finished sheet is subjected to creep deformation and forming correction, annealing and acid and alkali washing, a finished 650 DEG C titanium alloy sheet with thickness of 0.8-2.0 mm is obtained.

The invention provides a method for preparing large-size bulk amorphous composite materials, which belongs to the field of preparing amorphous alloy (metallic glass) and composite materials thereof. The method applies to superplastic diffusion bonding of bulk amorphous substances and fiber, and is characterized in that the bulk amorphous substances and the fiber are arranged in a certain mode (such as a layered mode and the like), put into a mold, pressurized and thermally insulated under gas protection or vacuum for superplastic diffusion bonding; pressure is released after a certain period of time; and workpieces are taken out of the mold. The invention also provides a novel device for preparing large-size bulk amorphous, fiber/amorphous composite materials through superplastic diffusion bonding. The device consists of a heating system, a heat insulation system, a mold system, a loading system, a gas protection system and a cooling system. The method and the device have the advantages of reinforcing the fiber, enabling the shape of amorphous alloy-base composite materials to be designed, enabling the volume of the fiber in the composite materials to be controlled and enabling the fiber to be used in other various amorphous alloy systems low in amorphous formation capability, and are applicable to armor boards, armor-piercing shells and the like.

The invention provides a preparation process of a Ti2AlNb/TA15 bi-metal titanium alloy composite hollow structure part. The Ti2AlNb/TA15 bi-metal titanium alloy composite hollow structure wing type component is prepared through the steps of blank preparation, surface treatment, welding stop agent coating, superplastic forming/diffusion bonding, cooling, out of a furnace and the like. The superplastic forming/diffusion bonding process method of the dissimilar material hollow structure part breaks through the key technology of the multi-layer hollow structure prepared by combining a Ti2AlNb intermetallic compound and an ordinary titanium alloy, the high-temperature resisting characteristic of the Ti2AlNb intermetallic compound and the good superplasticity of the TA15 titanium alloy are givento full play, structure weight losing is achieved, the guided missile thrust-weight ratio is increased, the application of the Ti2AlNb intermetallic compound to types is promoted, the material application range is expanded, the material utilization rate is increased, and the cost is reduced.

A method for superplastically forming and/or diffusion bonding a structural member and an associated structural member are provided. The structural member is formed at least partially of titanium, e.g., Ti-6Al-4V, and has a fine grain structure. For example, the grain size of the material of the structural member can be less than 2 micron. The member can be superplastically formed and/or diffusion bonded at a reduced temperature, thereby potentially reducing the thermal energy required for forming and bonding, and also reducing the effects of heating on the structural member and the forming apparatus. In addition, the structural member can be formed at an increased strain rate.

A method and apparatus for producing ultra-fine grained magnesium metal alloy material sheets. The apparatus molds and rapidly solidifies a metal alloy material to form a fine grain precursor. The precursor is then subjected to deformation strains that alter the grain structure of the precursor so as to form a ultra fine grained structure in sheet form. The sheet form may then be subjected to superplastic forming to form a net shaped article.

Disclosed is a method for enduing high-vanadium high-cobalt high-speed steel with superplasticity property which comprises the following steps, selecting master alloys, obtaining high speed steel block body with high vanadium and cobalt content with spraying forming technology, carrying out hot-rolling at a temperature of 950-1100 deg. C, keeping the reduction in pass to be 50-80%, and controlling the cooling down process. The invention can realize the one-time forming for knife tools and die arrangements with rather complex shapes.

An aluminium alloy plate with superplasticity and a manufacturing method thereof. The invention relates to an aluminium alloy plate with superplasticity and a manufacturing method thereof and aims to solve the problem that plasticity of existing 5083 alloy is low. The manufacturing method comprises the following steps: 1, weighing alloy raw materials including 4.0-5.0 wt% of Mg, 0.50-0.90 wt% of Mn, 0.05-0.20 wt% of Cr, 0.05-0.15 wt% of Zr, 0.02-0.08 wt% of Ti and the rest of Al; 2, smelting the alloy raw materials; 3, casting to prepare an ingot; 4, annealing the alloy ingot; 5, hot-rolling; and 6, carrying out medium-temperature coiling rolling to obtain the aluminium alloy plate. Horizontal elongation rate of the aluminium alloy plate is 220-240%, and its vertical elongation rate is 240-260%. The aluminium alloy plate has good superplasticity and also has good mechanical property.

The invention discloses a 3D super-plasticizing treatment method and superplasticity precision shaping method for magnesium alloy. Within the superplastic deformation temperature range of the magnesium alloy, a non-hollow magnesium alloy casting obtained after forging pretreatment passes through at least two cycles to obtain a forging stock of the set size, and 3D super-plasticizing treatment is finished, wherein the non-hollow magnesium alloy casting passes through the axis Z, the axis X and the axis Y in sequence to press down the stock to achieve a cycle. By means of 3D super-plasticizing forging treatment, through large plastic deformation in all directions, homogenizing, grain refining and structure densifying of materials are fully achieved, refined grains are averagely smaller than 20 microns, the equiaxial grain refining effect is remarkable, and the strength performance of the casting can be greatly improved. Through the superplasticity precision shaping method for the magnesium alloy based on 3D super-plasticizing treatment, a light magnesium alloy transition car coupler with high strength is prepared out; and compared with an existing transition car coupler, the weight is reduced by about 75%, the strength is above 350 MPa, and the requirement for the service life of the transition car coupler of this type can be met.

The invention belongs to the field of new materials and discloses Zr-Al-Ni-Cu bulk metallic glass achieving room temperature compression superplasticity. Zr with purity being 99.99wt%, Al with purity being 99.99wt%, Ni with purity being 99.99wt% and Cu with purity being 99.99wt% are smelted according to a vacuum melting method, and then a vacuum suction pouring method is adopted, so that the Zr-Al-Ni-Cu bulk metallic glass with the diameter being 2 mm is obtained. The Zr-Al-Ni-Cu bulk metallic glass has room temperature compression superplasticity and comprises ingredients of Zr62Al12Ni15Cu11, Zr62.5Al11.3Ni13.85Cu12.35, Zr63Al10.6Ni12.7Cu13.7, Zr63.5Al10Ni11.75Cu14.75, Zr64Al9.3Ni10.6Cu16.1, Zr64.5Al8.6Ni9.45Cu17.45, Zr65Al8Ni8.5Cu18.5, Zr65.5Al7.3Ni7.35Cu19.85 and Zr66Al6.6Ni6.2Cu21.2.

The invention provides a magnesium-base rare-earth alloy material and a preparation method thereof. The magnesium-base rare-earth alloy material comprises the components by weight percent: 7.0-1.0% of Y, 1.0-2.5% of Er, 2.0-3.0% of Zn, less than 0.03% of inevitable impurities of Fe, Cu, Ni and Si, and the balance of Mg. The methods of conventional smelting, homogenizing treatment, hot extrusion treatment, and the like, are adopted by the invention, and meanwhile a superplastic magnesium rare-earth alloy material with high strain rate is obtained. Under lower temperature (300-380 DEG C), the alloy has high strain rate (0.8*10-2-1*10-2s-1) and superplasticity, the coefficient of elongation of the alloy after being broken is 350%-520%. The production cost is effectively lowered, the production efficiency is increased, the operation is easily performed and the magnesium-base rare-earth alloy material is beneficial to large-scale application and popularization.

The present invention relates to a hydrogen-permeating superplasticity processing method of in-situ autogenous titanium base composite material in the field of composite material technology. Said method includes the following steps: (1), utilizing vacuum consumable electroarc furnace to smelt and prepare titanium base composite material ingot containing TiB and TiC hybrid reinforcement; (2), in beta-phase zone breakdown forging the composite material ingot, then in alpha + beta two-phase zone making conventional forging operation, after the forging operation is completed, removing oxide skin and defects of piping, segregation and dirts, etc from material surface; (3), placing the composite material into a vacuum furnace and making hydrogen-permeating treatment; (4), contour forging or free forging the hydrogen-containing composite material, and making it into a component; and (5), placing said component into a vacuum annealing furnace and making vacuum hydrogen-removing treatment.