1642 results about "Solution treatment" patented technology

The invention relates to a CuCrZr alloy with high strength and high conductivity, and a preparation and processing method thereof. The alloy comprises the basic ingredients in percentage by mass: 0.3 percent to 1.4 percent of Cr, 0.02 percent to 0.25 percent of Zr and the balance Cu, wherein the ingredients in the CuCrZr alloy are needed to meet the following requirements: (a) Cr/Zr is less than or equal to 5 and is greater than or equal to 1.9; and (b) Cr+Zr is less than or equal to 1.5 percent and is greater than or equal to 0.4 percent. The preparation and processing method comprises the following steps of: a, compounding, feeding, smelting and casting according to mass percent; b, surface milling; c, hot rolling; d, solution treatment; e, primary cold rolling; f, primary aging; g, secondary cold rolling; and h, secondary aging. The CuCrZr alloy has the tensile strength sigma b being 600-700 MPa, the plasticity elongation rate delta being 4-10 percent, and the conductivity being greater than 80 percent of IACS (International Annealed Copper Standard), can be widely applied to occasions with high strength and high conductivity for preparing resistance welding electrodes, liners of crystallizers of continuous casting machines, integrated circuit lead frame and the like.

The bearing rings 1 and 2 of a rolling bearing is formed of one kind of titanium alloys of beta type titanium alloys, near beta type titanium alloys and alpha+beta type titanium alloys. The titanium alloy has a surface hardness of Hv 400 or more and less than Hv 600 for increasing the corrosion resistance and wear resistance of the bearing ring. Spherical rolling elements 3 rolling on the raceway surfaces 1a and 2a of the bearing rings 1 and 2 are formed of ceramics such as silicon nitride. When beta type titanium alloys or alpha+beta type titanium alloys after a solution treatment and applied with an oxidation treatment at a low temperature of 400 to 600° C. are used as the material for the bearing ring, a bearing ring made of titanium alloy suitable to use under a circumstance requiring corrosion resistance is obtained.

The invention relates to an ultra pure electroslag remelting method for a high-performance corrosion resistant alloy, and the method comprises the following steps of: preparing the following ingredient components of a self-fluxing electrode bar in parts by weight: 25-34 parts of Ni, 25-29 parts of Cr, 2.5-4.5 parts of Mo and 30-45 parts of Fe, and carrying out vacuum induction melting, so as to obtain the self-fluxing electrode bar; slowly melting the self-fluxing electrode bar in melted electroslag remelting slag charge comprising the following components in parts by weight: 55-80 parts of CaF2, 5-25 parts of CaO, 5-15 parts of Al2O3 and 5-10 parts of MgO, purifying, and recrystallizing in a crystallizer, so as to obtain an electroslag ingot; and forging the electroslag ingot into a bar material at the temperature of 1130+/-5 DEG C, and carrying out solution treatment, so that the high-performance corrosion resistant alloy is obtained. By utilizing the ultra pure electroslag remelting method provided by the invention, the content of harmful elements such as sulphur and phosphorus in the alloy can be reduced, the impurity distribution of the alloy is improved, fining of structure can be facilitated, and the hot workability and yield of the alloy can be improved.

The invention relates to a production process of a precise stainless steel band for a vehicle sealing pad. The production process comprises the following working procedures of: first cold rolling, solid solution, second cold rolling, spraying and degreasing, hot water spraying, hot wind drying, pre-bending straightening, stress relieving annealing, final bending straightening, finished product cutting, and the like. The production process adopts a 20-roller sendzimir mill and a unique rolling process to carry out cold rolling. Through the processes of degreasing, solid solution treatment, bending straightening, stress relieving annealing, and the like, the thickness tolerance undulation of a product is small, mechanical properties are stable, the plate flatness is good, the product is not easy to generate cracks and secondary deformation during stamping, and the quality of the product is obviously improved, thus the production process is suitable for industrial production and can meet the requirement for high quality of the vehicle part industry.

The invention discloses a low pressure casting process for an aluminum alloy cylinder part. The aluminum alloy used by the method comprises the following materials in percentage by mass: 6.0 to 7.0 percent of Si, 0.3 to 0.5 percent of Mg, 0.1 to 0.2 percent of Ti, 0.05 to 0.15 percent of Fe and the balance of Al. After melting, thining, modification, and refining, the materials are subjected to low pressure casting and pouring; and after low pressure casting process of liquid lifting, filling, pressure maintaining and pressure releasing, the materials form a cast in a die cavity; and after a cast blank is subjected to solution treatment, and heat treatment of incomplete artificial aging, the cast has the advantages that: the texture is compact, casting defects such as pores, shrinkage porosity, shrinkage cavity, slag inclusion, and the like are avoided, the quality of the cast is improved; meanwhile, the working allowance of the cast is less, so the material utilization is improved and the production cost is reduced.

The invention relates to the technical field of welding, in particular to a method for controlling deformation of a nickel-based ageing-strengthening high-temperature alloy casing welding assembly, and a piece of technological equipment of the method. According to the method, the welding deformation is controlled by using rigid limit of materials with close linear expansion coefficients, a tooling structure that can meet rigid supporting requirements during welding as well as control and eliminate residual stress deformation during welding is adopted, after an inner ring and eight T-shaped supporting plate components form an eight-diagram structure, a heat treatment process at the temperature of 550 DEG C for eliminating stress is additionally performed so as to reduce residual stress between the inner ring and the roots of the supporting plates before electron beam welding; after all welding processes are completed, a vacuum solution treatment process at the temperature of 970 DEG C is additionally performed, and a double aging treatment process at the temperature of 720 DEG C and 620 DEG C is further additionally performed to completely eliminate residual internal stress after welding so as to achieve service performance. According to the invention, the problems that the conventional combustion engine can not control fatigue crack, and requirements on the reliability and the service life of the combustion engine can not be met are solved; by adopting the novel welding technology method and the technological equipment, the investment is small, the operation is simple and the engineering application is facilitated.

The invention discloses an austenitic stainless steel belt and a manufacturing method thereof. The invention is characterized by comprising the following chemical elements in terms of weight percentage: 0.04 to 0.12 percent of C, 0.4 to 1. percent of Si, 0.8 to 2 percent of Mn, less than or equal to 0.04 percent of P, less than or equal to 0.03 percent of S, 17 to 19 percent of Cr, 7 to 10 percent of Ni, 0.25 to 0.5 percent of Cu and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: smelting; continuous casting with thin belts; control of cooling and winding; acid pickling, direct cold rolling and annealing; acid pickling again and cold rolling to achieve the thickness of a finished product; annealing after achieving the thickness of the finished belt steel, acid pickling, leveling, and length cutting into a finished coil. By utilizing the element of Cu, the invention reduces the use amount of Ni in the steel, reduces the production cost, simultaneously reduces the content of the residual ferrite in the steel, improves the wearing resistance of the steel, adopts direct cold rolling to match the high-temperature annealing procedure, and saves the procedures of hot rolling and solution treatment so as to lead the production process to be simple and stable.

The invention discloses martensite stainless steel and preparation method for flat strips of martensite stainless steel. The martensite stainless steel comprises following chemical components by weight percentage: C 0.02 to 0.06%, Si 0.3 to 0.5%, Mn 1.0 to 1.5%, Ni 8.5 to 9.0%, Cr 17.5 to 18.5%, Ti 0.4 to 0.6%, P no more than 0.009% and S no more than 0.009%, with the balance being Fe. The preparation method for flat strips of the martensite stainless steel comprises the following steps: a) weighing above-mentioned chemical components at desired weight percentage; b) carrying out vacuum induction melting; c) carrying out casting to obtain remelt electrode bars; d) carrying out electroslag remelting to obtain steel ingots; e) forging steel ingots into billets; f) processing billets into round strips; g) carrying out solid solution treatment; h) drawing treated blanks into wires; i) preparing flat strips. According to the invention, equivalents of nickel and chromium are strictly controlled, the ratio of C to Ti and alloy elements are optimized, EVR smelting is carried out and such alloying elements as C, Si, Mn and Ti are added, thereby enabling formation of a metastable austenite structure; a predeformed phase-changed martensite wire material is obtained by wire drawing; and the ultra high strength deformed flat strips of martensite stainless steel are obtained by flat strip rolling.

The invention discloses a method for removing microcracks from additive manufacturing nickel-base high-temperature alloy components manufactured by electron beam selective melting, and belongs to thetechnical field of high-temperature alloy and additive manufacturing. According to the method disclosed by the invention, additive manufacturing nickel-base high-temperature alloy is treated with heattreatment technologies, including hot isostatic pressing treatment, solid solution treatment and aging treatment in sequence, and compact additive manufacturing nickel-base high-temperature alloy materials without the microcracks can be prepared with the heat treatment technologies, and have excellent microstructure and mechanical properties.

The invention belongs to the field of production of ultrahigh-strength plastic alloy steel, and relates to a preparation method of micro/nano-structure ultrahigh-strength plastic stainless steel containing Nb. The preparation method comprises the steps of: firstly preparing materials according to a composition proportion, adding 0.05-0.15% of Nb element on the basis of 316L austenitic stainless steel, then carrying out vacuum induction furnace smelting, casting blank forging, forged piece hot rolling and solution treatment, carrying out cold deformation on the steel plate which undergoes the solution treatment with deformations of 40%, 60%, 80% and 90% and with single reduction in pass controlled within 3-10% to prepare steel plate with different cold deformations, annealing the steel plate which undergoes the cold deformation with heating rate controlled at 50-200 DEG C/s, with heating temperature within 750-950 DEG C and with heat preservation time within 5-100s, and cooling to the room temperature at a cooling rate of 50-400 DEG C/s to obtain a superfine austenite structure with micro-nano scale. The obdurability of the material is synchronously improved. The yield strength of the final product can be up to 750-800MPa, the strength of extension is up to 1100-1200MPa and the percentage of elongation is 35-45%.

The invention relates to an aluminum alloy panel for automobile body lightweight and a preparing method of the aluminum alloy panel. The aluminum alloy panel is characterized by comprising chemical components including, by mass percent, 1.2%-2.2% of Mg, 0.8%-1.5% of Si, 0.1%-0.3% of Fe, 0.2%-0.8% of Mn, 0.2%-0.5% of Cu, 0.05%-0.2% of Zr, 0.01%-0.5% of Cr, 0.05%-0.2% of La, smaller than or equal to 0.2% of Zn, smaller than or equal to 0.1% of Ti, smaller than or equal to 0.05% of each of the other impurity elements, and the balance Al, wherein the total content of the other impurity elements is smaller than or equal to 0.15%. According to the preparing method of the aluminum alloy panel for automobile body lightweight, the aluminum alloy panel is obtained through smelting, refining, casting, homogenizing, head cutting and face milling, hot rolling, intermediate annealing, cold rolling and solution treatment. The aluminum alloy panel for automobile body lightweight has high baking hardening performance and good forming performance, and the aluminum alloy panel has good comprehensive performance through reasonable optimization of the content of the elements in the alloy and the heat treatment technology.

The invention discloses a formula of a copper nickel tin alloy strip and a production process. The formula of the alloy strip comprises the following components in percentage by weight: 19.0 to 21.0 percent of Ni, 4.0 to 6.0 percent of Sn, 0.01 to 0.05 percent of Zr and the balance of Cu. The production process comprises the following steps of: proportioning, smelting, bath analysis, deoxidation, converter heat preservation, horizontal continuous casting, solution treatment, surface milling, rough rolling, thickness longitudinal shearing, strong convection bright annealing, cleaning, precision rolling, multistage ageing, bending, straightening and slitting. The production process has no pollution, the production flow is short, the alloy strip blank has small specification size and high quality, cold rolling is directly performed, a hot rolling process is saved, and the production efficiency is improved; the obtained copper nickel tin alloy has the properties of high strength, high elongation, high hardness, high elasticity, stress corrosion resistance and the like, the performance of the copper nickel tin alloy is close to that of beryllium bronze, and the copper nickel tin alloy can partially replace the beryllium bronze to manufacture elastic elements.

A high-strength, high-conductivity and high-extensibility rare earth copper alloy and a preparation method thereof are disclosed. The alloy is composed of following components in percentage by weight: 0.5 to 1.5% of chromium, 0.3 to 0.5% of zirconium, 0.1 to 0.3% of nickel, 0.2 to 0.5% of titanium, 0.2 to 0.4% of manganese, 0.02 to 0.15% of rare earth elements and the balance of copper and inevitable impurity elements, wherein the rare earth elements are one or two elements of erbium and lanthanum. The preparation method comprises following steps: preparing intermediate alloy, smelting, moulding, casting, treating solid solution, drawing to deform, performing an aging treatment, and a cold rolling treatment. The components and the ratio of the components are limited to let each component have a combined action, thus the comprehensive properties of the alloy material are prominently improved: the extension strength is larger than 630 MPa, the hardness is larger than 190 HV, the ductility is larger than 10%, the conductivity is larger than 80%IACS, and the softening temperature is larger than 520 DEG C; and the rare earth copper alloy can satisfy the requirements of materials in the electronic industry such as lead frame on copper alloy performances.

The invention provides a new method for eliminating aluminium alloy workpiece residual stress, mainly aims at defects existing in a conventional residual stress eliminating method that the cost is high, the operation is complex, the requirement is high, the workpiece mechanical property is reduced, the workpiece surface is damaged, and the use is limited, and achieves double effects of eliminating residual stress and refining crystal grains through the organic combination of subzero treatment, the uphill quenching technology and conventional heat treatment. The new method has the specific operating steps of solution treatment, subzero treatment, uphill quenching and aging treatment, and has the characteristics that the technology method is simple, the environment is protected, the operation cost is low, the effect is superior to that of the conventional residual stress eliminating method, the residual stress is eliminated, meanwhile, the workpiece comprehensive mechanical property can be improved, and industrialized scale production can be realized.

The invention relates to an elastic brass alloy material. The material comprises the following components in percentage by weight: 70 to 71 percent of copper, 24 to 25 percent of zinc, 2 to 3 percent of aluminum, 1 to 3 percent of nickel and 0.5 to 1 percent of chromium. A preparation method comprises the following steps of: smelting; performing hot rolling; performing solid solution treatment; annealing, and performing cold rolling; and performing ageing treatment. The chromium element of which the solid solubility is reduced with the reduction of temperature is added into a metal matrix, a supersaturated solid solution is formed through high temperature sold solution quenching treatment, and is decomposed through ageing treatment to form a large number of fine dispersed Cr particles, and the particles are dispersedly distributed in the matrix to form a precipitated phase, so that the strength, electrical conductivity and elasticity of an alloy are improved. An elastic brass alloy strip prepared by the method meets the technical requirements on temperature rise, electrical performance and the like after being made into a fuse clip, can replace scarce tin phosphorus bronze and is applied to related fields.

The invention relates to a process for producing an accurate stainless steel band applied in an electronic industry. The process comprises the following steps of: the first cold rolling process; the first spray degreasing process; the first hot-water spraying process; the first hot-wind drying and solid dissolving process; the second cold rolling process; the second spray degreasing process; the second hot-water spraying process; and the second hot-wind drying process, bending stretching and straightening process and the process of cutting into finished products. According to the production process, a twenty-Hi sendzimir rolling mill and an unique rolling process are adopted for cold rolling; and the processes such as degreasing, solid dissolving treatment, bending stretching, straightening, and the like are performed, so that the product has little tolerance fluctuation of the thickness, stable performance, uniform surface color and roughness and no color difference, good plate flatness, improved quality and capacity of meeting the requirements of the electronic industry on top quality.

The invention discloses a copper-chromium-zirconium alloy contact wire and a production technique thereof. The copper-chromium-zirconium alloy contact wire is composed of copper, chromium, zirconium and inevitable impurity elements according to the set mass percentages. In preparation, the main technique comprises the steps of raw material preparation, up-drawing continuous casting, CONFORM continuous squeezing, primary cold machining, solution treatment, secondary cold machining, aging treatment and finished product drawing. According to the copper-chromium-zirconium alloy contact wire manufactured by the technique and materials, the matching of the contact wire raw materials is reasonably adjusted, the ratio of all element components in the contact wire is adjusted, and the special production technique is combined so that a high-strength high-conductivity contact wire product can be produced, wherein the weight of one single contact wire product is larger than two tons, the IACS electrical conductivity of the contact wire product is 75-90%, and the tensile strength of the contact wire product is 550-700 MPa; and the requirement of current electric railway high-speed development can be better met.

The invention discloses a rare earth Er microalloyed Al-Zn-Mg-Cu alloy and a preparation method thereof, which belong to the technical field of metal alloy. In the invention, 0.02 to 0.1 weight percent of rare earth Er is added into an Al-Zn-Mg-Cu alloy. The method comprises: firstly, coasting an alloy ingot, and annealing by a double-stage homogenizing annealing process; secondly, performing forging deformation or extrusion deformation and solution treatment at 465 to 475 DEG C; and finally, performing peak aging treatment or double-stage overaging treatment. In the invention, the rare earthEr is added into the Al-Zn-Mg-Cu alloy in a proper amount and mode to produce effective microalloying effect with the alloy, so that the alloy has high strength and high plasticity and fracture toughness.

The invention relates to a moisture absorption and perspiration fiber with a hydrophilic function, comprising filaments and chopped fibers. The preparation process comprises the following steps: modifying conventional polyester to obtain hydrophilic modified polyester; mixing the conventional polyester, the hydrophilic modified polyester and water soluble polyester according to a certain proportion for carrying out composite spinning; extruding the mixture by a profile spinneret and carrying out postprocessing process for spinning to obtain the hydrophilic moisture absorption and perspiration polyester filaments or chopped fibers. Alkaline solution treatment is carried out on fabrics made from the fiber provided by the invention to form multiple micropores and trenches in the surfaces of the fabrics, so that the fabrics are dry and comfortable with water absorption and perspiration and ventilation properties, thus the fabrics can be manufactured into sportswear and underwear. In the invention, structural design and chemical modification of the fiber are combined, so that the moisture absorption and perspiration property is greatly enhanced; and in addition, as the fiber is free from influence of blend fiber or the manufacturing process, the applicability is wide.

The invention provides a method for preparing a high-performance Cu-Fe deformation in-situ composite material by magnetic field treatment, which is characterized in that the Cu-Fe deformation in-situ composite material in the method is finally prepared into a formed copper material through technical process flows of material proportioning, smelting, casting or continuous casting, magnetic field control solidification, hot forging or hot milling, solid solution treatment, cold milling, cold pulling and magnetic field ageing control. The magnetic field is exerted in the ingot casting solidification process, the solidification of the Cu-Fe deformation in-situ composite material is controlled, Fe dendritic crystals carry out extremely obvious thinning, and the Fe aliquation is reduced, so the material disperses and distributes the uniform and fine Fe fiber phase in a base body after the subsequent cold deformation processing, and the intensity of the material is greatly improved. The magnetic field is exerted in the ageing process treatment process for promoting the Fe separation, increasing the separation amount of Fe particles, reducing the separation phase dimension and promoting the separation phase dispersion distribution, so the conductivity of the material is greatly improved, and the intensity of the material is further improved. The preparation process is simple, and the cost is low. The invention is applicable to the preparation of the high-performance Cu-Fe deformation in-situ composite material or other similar materials.

The invention provides a preparation method of an Al-Cu-Mg-Ag ultrafine crystal heat-resistant aluminum alloy, comprising the following steps: hot extrusion, solid solution hardening, equal channel angular pressing and ageing treatment, thus finally improving the heat resistance of Al-Cu-Mg-Ag alloy. The specific steps are as follows: homogenizing annealing of the as-cast aluminum alloy, hot extrusion with the extrusion ratio of 8-15, multi-pass equal channel angular heat extruding deformation at the temperature of 350-430 DEG C, solution treatment, hardening in water at a room temperature, and then ageing treatment at the temperature of 150-210 DEG C; or solution treatment of the alloy in a hot extrusion state, hardening in water at the room temperature, multi-pass equal channel angular heat extruding deformation at the room temperature and then ageing treatment. The process method of the invention can improve the heat resistance of the Al-Cu-Mg-Ag alloy and enlarge the application range of the aluminum alloy on the basis of the existing alloy. The preparation method of the invention has simple process and convenient operation, and can effectively refine crystal particles of the Al-Cu-Mg-Ag alloy, improve the density of a precipitated and strengthened phase, enhance the overall strength and the high-temperature heat resistance of the Al-Cu-Mg-Ag alloy, and achieve industrialized production and application.

The invention relates to copper-containing antibacterial stainless steel and a preparation method thereof, and belongs to the technical field of materials. The copper-containing antibacterial stainless steel comprises the following components in percentage by weight: 0.08 to 0.25 percent of C, 11.00 to 30.00 percent of Cr, less than or equal to 2.80 percent of Si, 0.40 to 3.20 percent of Cu, less than or equal to 2.00 percent of Mn, less than or equal to 1.10 percent of Zn, less than or equal to 3.20 percent of Al, less than or equal to 0.30 percent of N, one or more of the following alloy elements: Ti, Nb, Mo, V, Zr, Sn and Sc (the content of each alloy element is less than or equal to 1 percent), and the balance of Fe and inevitable impurities. The preparation method comprises the following steps of: preparing materials; smelting; performing ultrasonic treatment after modification; moulding by casting; and performing heat treatment comprising solution treatment and aging treatment. The copper-containing antibacterial stainless steel prepared by the method has low production cost and good antibacterial effect and mechanical property.

The invention belongs to the aluminum lithium alloy heat treatment technology, in particular to a heat treatment technology capable of improving the stress corrosion resisting performance of an aluminum lithium alloy. Applicable alloy components of the technology comprise main alloying elements including, by weight percent, 0.5%-5.0% of Cu, 0.4%-2.5% of Li, 0.1%-4.0 % of Mg and 0.1%-4.0% of Zn, comprise microalloying elements including any one to four of, by weight percent, 0.04%-0.02% of Zr, 0.05%-0.60% of Sc, 0.20%-0.80% of Mn and 0.1%-0.9% of Ag and comprise, by weight percent, smaller than or equal to 0.10% of Si, smaller than or equal to 0.10% of Fe, smaller than or equal to 0.10% of Ti, smaller than or equal to 0.05% of each of other impurities and the balance Al, wherein the total amount of other impurities is smaller than or equal to 0.15%. After a deformed product is subjected to annealing treatment, cold deformation of a certain deformation amount is conducted, then solution hardening is conducted, regulation and control over the recrystallization degree and the grain boundary precipitates can be achieved through the manner, and other mechanical properties of the alloy are kept unchangeable while the stress corrosion resisting performance of the alloy is improved. The alloy preparing steps include annealing treatment, cold deformation treatment, solution treatment and ageing treatment. The technology is suitable for high-performance Al-Cu-Li-X series aluminum lithium alloy thick plates and forge pieces used in the fields of aviation, spaceflight and weapons.

The hot roller rolling process of composite stainless steel/aluminum plate includes the main steps of: physical and chemical surface treatment of stainless steel plate and aluminum plate including alkali solution treatment, cold water and hot water flushing, soaking with nitric acid solution, cold water flushing, ultrasonic defatting of stainless steel plate in metal washing agent and cold water flushing and stoving; laminating stoved stainless steel plate and aluminum plate and heating at 250-500 deg.c; composite rolling in rolling mill with roller preheated to 100-400 deg.c; and final diffusion annealing of the composite plate. The present invention has the main advantages of less deformation in total reduction degree of 10-35 %, obviously raised interface combining strength, high qualified product rate and very high deep drawing performance.

The invention provides a preparation method of an ultrafine grain rare earth magnesium alloy. The method comprises the following steps of: firstly performing solution treatment on a rare earth magnesium alloy cast ingot to obtain the rare earth magnesium alloy after the solution treatment; then performing heat deformation processing on the obtained rare earth magnesium alloy after the solution treatment to obtain a heat-deformed rare earth magnesium alloy plate, wherein the heat deformation processing temperature is 350 DEG C-450 DEG C; and finally performing accumulative roll bonding with the single-pass rolling reduction of 50% on the obtained heat-deformed rare earth magnesium alloy plate, and annealing to obtain the ultrafine grain rare earth magnesium alloy. According to the preparation method provided by the invention, a heat deformation processing-accumulative roll bonding compound process is firstly adopted to successfully prepare the ultrafine grain rare earth magnesium alloy, and the problem of deterioration of mechanical properties, which is caused by non-uniform distribution of thick and big LPSO (long period stacking ordered) phases in the alloy is effectively solved; and furthermore, the preparation method provided by the invention has the advantages of simple process flow and low equipment cost, and is favorable for further large-scale industrial production.

The invention specifically relates to a high-strength high-toughness Al-Zn-Mg-Cu aluminum alloy and a heat treatment method thereof. The heat treatment method for the high-strength high-toughness Al-Zn-Mg-Cu aluminum alloy comprises the following concrete steps: putting an alloy ingot into a salt bath furnace for heating, and successively carrying out two-stage homogenization treatment, milling and hot-rolling so as to obtain an alloy sheet; then placing the alloy sheet in the salt bath furnace for two-stage solid solution treatment so as to obtain an alloy having undergone solid solution treatment; putting the alloy having undergone solid solution treatment into liquid nitrogen for quenching; and finally, putting the alloy into a microwave heat treatment furnace for regression and aging treatment, carrying out primary T6 treatment, then carrying out heat-preserved regression treatment, carrying out secondary T6 treatment after water quenching, taking out the alloy from the furnace andcarrying out air-cooling to room temperature so as to obtain the high-strength high-toughness Al-Zn-Mg-Cu aluminum alloy. The heat treatment process of the invention is simple, can realize the precise control of temperature through microwave heating, and has obvious advantages in the aspects of cleanness, high efficiency and energy conservation. The aluminum alloy prepared in the invention has the characteristics of high strength, high toughness and high corrosion resistance, and is suitable for large-scale industrial production.

This invention relates to a method of manufacturing highly worked pieces of AlCuMg alloy, comprising the steps of: a) casting a plate composed of (weight per cent): Cu: 3.8-4.5 Mg: 1.2-1.5 Mn: 0.3-0.5 Si<0.25 Fe<0.20 Zn<0.20 Cr<0.10 Zr<0.10 Ti<0.10, b) possibly homogenizing at a temperature between 460 and 510° C. for 2 to 12 hrs, and preferably at a temperature between 470 and 500° C. for a duration for 3 to 6 hrs, c) hot rolling at an input temperature between 430 and 470° C., and preferably between 440 and 460° C., d) cutting out sheets, e) forming in one or several processes, such as stretch forming, drawing, flow spinning, or bending, f) solution treating between 480 and 500° C., for a duration between 5 min and 1 hr, g) quenching, wherein forming can take place before and after solution treatment and quenching. The invention is applicable in particular for manufacturing aircraft fuselage panels.

The invention discloses a high-strength, high-conductivity and heat-resisting aluminum alloy bus and a production method thereof. The high-strength, high-conductivity and heat-resisting aluminum alloy bus comprises the following components in percentage by mass: 0.4-1.1 percent of magnesium (Mg), 0.3-0.9 percent of silicon (Si), 0.85-2.1 percent of copper (Cu), 0.03-0.3 percent of zirconium (Zr), 0.05-0.38 percent of rare earth (La), less than 0.4 percent of Ferrum (Fe), less than 0.01 percent of manganese (Mn) and the balance of aluminum (Al), wherein the ratio of Cu to Mg is 1.9-2.3. The production method comprises the steps of: uniformly annealing a cast ingot obtained through smelting and casting for 10-20h at a temperature of 470-550 DEG C, furnace-cooling; controlling the temperature of the cast ingot to be 480-540 DEG C for thermally deforming, wherein the final temperature of the thermal deformation is not less than 380 DEG C, the total deformation rate of the thermal deformation reaches 80-94 percent; then carrying out cold deformation on a thermally deformed blank at the total deformation rate of 80-90 percent; annealing the deformed product, wherein the annealing temperature is 330-350 DEG C, the insulation time is 2h; carrying out solution treatment for 1-3h at a temperature of 490-525 DEG C; and carrying out artificial ageing treatment for 24-36h at a temperature of 175-200 DEG C.

The embodiment of the invention provides a preparation method of a polycrystalline silicon thin film, a polycrystalline silicon thin film transistor and an array substrate and relates to the technical field of display. By means of the preparation method, polycrystalline silicon crystals are uniform, the grain size is increased, crystal quality is improved, and therefore the electrical properties of the thin film transistor are improved. The preparation method of the polycrystalline silicon thin film comprises the steps that an amorphous silicon thin film is formed on a substrate; the amorphous silicon thin film is treated through an excimer laser annealing method, so that the amorphous silicon thin film is crystallized into the polycrystalline silicon thin film. Furthermore, after the amorphous silicon thin film is formed and before the amorphous silicon thin film is treated though the excimer laser annealing method, the preparation method further comprises the steps that the surface of the amorphous silicon thin film is subjected to nickel salt solution treatment, so that a nickel salt solution is uniformly smeared on the surface of the amorphous silicon thin film. The method is used for preparation of the polycrystalline silicon thin film, the low-temperature polycrystalline silicon thin film transistor and the array substrate requiring that the uniformity of the polycrystalline silicon crystals is improved, the grain size is increased, and crystal quality is improved.

The invention discloses a vanadium extraction technology of low-grade high-calcium vanadium-containing steel slag. The technology comprises the following steps of: a, performing pretreatment of the low-grade high-calcium vanadium-containing steel slag; b, performing oxidation calcification roasting of the low-grade high-calcium vanadium-containing steel slag; c, performing carbonation leaching treatment of the vanadium-containing steel slag after the roasting to obtain vanadium-containing leachate; d, adding an acid to the vanadium-containing leachate to precipitate vanadium, and filtering to obtain coarse vanadium; e, performing alkaline solution treatment of the coarse vanadium, and filtering to obtain V<5+>-containing filtrate; and f, adding NH4Cl into the V<5+>-containing filtrate, reacting to generate NH4VO3, and performing deamination to obtain V2O5 finally. Through the vanadium extraction technology disclosed by the invention, the requirement on calcium content is reduced; high-purity vanadium pentoxide is produced from low-grade high-calcium vanadium-containing steel slag; and the vanadium resource in the vanadium-titanium magnetite is effectively recycled and utilized. The invention provides conditions for the vanadium extraction of a converter single-link method; and the vanadium-containing molten iron is directly used for steelmaking, the vanadium enters the low-grade high-calcium steel slag, and an additional converter for vanadium extraction is not needed, thereby avoiding the interference and influence on the steelmaking caused by the additional vanadium extraction converter for vanadium extraction.