1895 results about "Solution treatment" patented technology

The invention relates to a heat treatment method for additive manufacturing of a nickel-based superalloy, and relates to the technical field of additive manufacturing. The heat treatment method comprises the following steps that the additive manufacturing nickel-based superalloy is placed at the first temperature, and first-step stress relief annealing treatment is carried out; and then the temperature is increased to a second temperature for second-step stress relief annealing treatment, and after cooling, the additive manufacturing nickel-based high-temperature alloy subjected to stress relief annealing treatment is obtained. The first temperature is 850-890 DEG C, and the second temperature is 900-950 DEG C; carrying out solution treatment on the additive manufacturing nickel-based superalloy subjected to the stress relief annealing treatment to obtain the additive manufacturing nickel-based superalloy subjected to the solution treatment; and aging treatment is conducted on the additive manufacturing nickel-based superalloy obtained after solution treatment, and the additive manufacturing nickel-based superalloy obtained after heat treatment is obtained. The method is mainly used for improving the volume fraction of the gamma'phase of the additive manufacturing nickel-based superalloy, obtaining the gamma 'phase with high cubic degree and proper size, and eliminating cracking and recrystallization caused by residual stress.

The invention belongs to the technical field of alloy materials, and particularly relates to a preparation method of a fine-grain near-alpha high-temperature titanium alloy. The preparation method of the fine-grain near-alpha high-temperature titanium alloy comprises the following steps that (1) a construction platform of SLM machining equipment is filled with alloy powder, and SLM machining is started; during SLM machining, the laser power ranges from 260 W to 380 W, the scanning speed ranges from 1000 mm / s to 1500 mm / s, and the scanning interval ranges from 0.05 mm to 0.15 mm; the alloy powder is a mixture of Ti60 alloy powder, boron powder and iron powder; (2) sequentially carrying out destressing treatment, solution treatment and aging treatment on a product obtained by SLM processing; the temperature of the destressing treatment and the temperature of the aging treatment are independently selected from 600-1000 DEG C, the temperature of the solution treatment is 1000-1300 DEG C, and the temperature of the solution treatment is larger than the temperature of the destressing treatment and larger than the temperature of the aging treatment. By adjusting and controlling the laser power, the scanning speed and the scanning interval in the SLM machining and forming process and combining a reasonable and effective heat treatment process, the alloy material with the density superior to 99.95% is obtained.

The invention discloses ultralow-temperature high manganese steel and a manufacturing method of an ultralow-temperature high manganese steel plate. The ultralow-temperature high manganese steel comprises the following components in percentage by weight: 0.35-0.55% of C, 0.01-0.10% of Si, 20.00-30.00% of Mn, 0.01-0.10% of Al, less than or equal to 0.005% of P, less than or equal to 0.003% of S, 3.0-5.0% of Cr, 0.3-1.0% of Cu, 0.2-1.20% of Ni, less than or equal to 0.008% of N, less than or equal to 0.002% of O, less than or equal to 0.0002% of H and the balance of Fe and inevitable impurity elements. The manufacturing method of the ultralow-temperature high manganese steel plate comprises the steps of molten iron pretreatment, K-OBM-S converter smelting, LF refining, continuous casting, annealing and coping, hot rolling, online solution treatment and the like. According to the method, high steel purity, low phosphorus and sulfur content, small segregation of the casting blank and the steel plate, good macrostructure of the casting blank and no crack on the surface and in the casting blank can be guaranteed, and the finished steel plate has the characteristics of low yield ratio, high tensile strength, high ultralow-temperature toughness, small thermal expansion coefficient, good fatigue resistance and the like; through the implementation of the invention, the manufacturing cost of the steel for the liquefied natural gas storage tank can be reduced to 1 / 3 of that of 9% Ni steel in the prior art.

The invention provides a multi-step aging treatment method for improving the toughness of an ultrahigh-strength steel ingot, and belongs to the technical field of steel heat treatment. The treatment method comprises the following steps: carrying out solution treatment on the ultrahigh-strength steel at the temperature above AC3, carrying out water cooling or oil cooling to the room temperature, then carrying out subzero treatment, taking out and recovering to the room temperature; the multi-step aging treatment comprises the first step of single-time or multi-time low-temperature aging at the temperature of 400-550 DEG C and the second step of high-temperature aging at the temperature of 550-650 DEG C, and the ultrahigh-strength steel ingot is obtained. According to the method, the content of reversed austenite is increased, especially film-shaped austenite with stable mechanics is increased, meanwhile, it is guaranteed that a precipitated phase is not obviously coarsened, and good obdurability matching is achieved.

The invention relates to the technical field of magnesium-aluminum alloy heat treatment, and discloses a high-strength and high-conductivity magnesium-aluminum alloy heat treatment method which comprises the following steps: step 1, surface cleaning treatment: carrying out surface cleaning treatment on a magnesium-aluminum alloy workpiece to remove oil stains, impurities and an oxide layer on the surface; secondly, preheating treatment is conducted, specifically, the cleaned magnesium-aluminum alloy workpiece is put into a heating furnace, the temperature is slowly increased to 200 DEG C at the temperature increasing speed of 10 DEG C / min, and heat preservation is conducted for 1-2 hours at the temperature; thirdly, the temperature is rapidly increased to the solid solution temperature, and after preheating treatment is completed. Precipitated phase distribution is optimized through two-stage aging treatment, a precipitated phase is preliminarily formed through low-temperature short-time aging, then the precipitated phase is uniformly grown through high-temperature long-time aging, local aggregation is avoided, meanwhile, solution treatment and quenching cooling are optimized, uniform dissolution of solute atoms is ensured, the alloy strength and hardness are improved, and the service life of the alloy is prolonged. And the fatigue resistance and the crack propagation resistance are remarkably improved through uniform precipitated phase distribution.

The invention relates to a preparation method of a carbon fiber reinforced metal matrix composite brake disc, and belongs to the technical field of brake disc preparation. Immersing the carbon fiber in an ethanol solution containing a silane coupling agent, and drying; the aluminum-based alloy powder, the copper-based alloy powder and the silicon carbide particles are put into a planetary ball mill to be subjected to ball milling, and metal matrix mixed powder is obtained; the pretreated carbon fibers are woven into a three-dimensional woven prefabricated body, then pores of the prefabricated body are evenly filled with metal matrix mixed powder, cold press molding is conducted, and a composite material prefabricated body is obtained; putting the composite material prefabricated body into a vacuum hot-pressing sintering furnace, and sintering to form a carbon fiber reinforced metal matrix composite material brake disc blank; after solution treatment, adding a rare earth coordination type enhancer and carrying out aging treatment; the carbon fiber reinforced metal matrix composite brake disc prepared by the method has excellent wear resistance and mechanical properties, and can meet the use requirements of modern high-performance vehicles on brake discs.

The present application belongs to the technical field of superalloys. Disclosed is a preparation method for a nickel-based superalloy. The present application solves the problem of a nickel-based superalloy in the prior art making it difficult to satisfy the comprehensive requirements of a component for both a long alloy endurance life and a low crack propagation rate. The preparation method comprises: step 1: performing smelting, so as to obtain a cast ingot; step 2: subjecting the cast ingot to a homogenizing heat treatment, wherein the homogenizing heat treatment comprises two sections of heat preservation; and after the second-section heat preservation, performing furnace cooling to 1000+ / -10°C or below, and then performing discharging and air cooling; step 3: preparing a bar blank and a forging piece by means of forging; step 4: performing a solution treatment; and step 5: performing a stabilization and aging treatment, so as to obtain a nickel-based superalloy. The nickel-based superalloy prepared by means of the method of the present application has a high strength, good low-cycle fatigue performance, a low crack propagation rate and excellent comprehensive performance.

The present application relates to the field of metal material manufacturing, and in particular to a GH4151 alloy bar and a preparation method therefor and a use thereof. The method comprises the following steps: (1) carrying out homogenization heat treatment on a GH4151 alloy cast ingot to obtain a heat treated bar; (2) forging the heat treated bar to obtain a forged bar; (3) carrying out hot rolling treatment on the forged bar to obtain a hot rolled bar; (4) carrying out solution treatment on the hot rolled bar to obtain a solid solution bar; (5) carrying out cold drawing treatment on the solid solution bar to obtain a cold drawn bar; and (6) carrying out aging treatment on the cold drawn bar to obtain a GH4151 alloy bar. According to the GH4151 alloy bar prepared in the present application, grains can be effectively refined, the surface dimensional precision is improved, and the tensile strength of the prepared GH4151 alloy bar is improved, so that the GH4151 alloy bar has excellent mechanical properties.

The invention relates to the technical field of alloy materials, in particular to a high-strength alloy material based on a rail transit vehicle and a processing technology of the high-strength alloy material. Raw materials are smelted and cast to obtain a cast ingot; the cast ingot is sequentially subjected to solution treatment and aging treatment, and an alloy material is obtained; uniformly mixing the compound, mica powder, a curing agent and an epoxy diluent, adding epoxy resin, a defoaming agent and a flatting agent, and performing ultrasonic treatment to obtain a corrosion-resistant coating; the high-strength alloy material is obtained by sequentially grinding, polishing, cleaning and drying the surface of an alloy material, coating a corrosion-resistant coating, and curing to form a corrosion-resistant coating. The prepared high-strength alloy material has excellent mechanical properties, corrosion resistance and hydrophobicity, and is suitable for application requirements of rail transit vehicles.

The invention discloses an ultrasonic vibration thermal aging treatment method and a high-performance aluminum-magnesium-silicon alloy material. Firstly, solution treatment and water-cooling quenching are carried out at the temperature of 555 DEG C, and then coupling treatment of ultrasonic vibration and thermal aging is carried out at the temperature of 150 DEG C; and under the combined action of ultrasonic vibration and a temperature field, precipitation of a beta ''phase is remarkably accelerated, proliferation and movement of dislocation are improved, grain refinement and microstructure optimization are promoted, and comprehensive improvement of the comprehensive mechanical property of the 6082 aluminum alloy is achieved within short aging. After the obtained high-performance 6082 aluminum alloy is treated for 1-3 hours, the hardness is improved to 120-125 HV, and the tensile strength is improved to 320-330 MPa. The ultrasonic aging vibration device comprises an ultrasonic generator, a transducer, an amplitude-change pole, a drying box, a fixed base and a fixed frame, efficient transmission of ultrasonic energy and stable vibration are ensured, and therefore the comprehensive mechanical property and machining quality of 6082 aluminum alloy are remarkably improved.

The invention belongs to the technical field of metal materials, and particularly relates to a high-corrosion-resistance magnesium alloy plate with filiform corrosion characteristics and a preparation method of the high-corrosion-resistance magnesium alloy plate. Based on the total amount of the magnesium alloy plate, the magnesium alloy plate is prepared from the following elements in percentage by mass: 6 to 9 percent of Al, 0.05 to 0.15 percent of Sc, 0.05 to 0.15 percent of Y, 0.05 to 0.15 percent of Mn and the balance of Mg and inevitable impurity elements; the preparation method of the alloy comprises the following steps: smelting an alloy cast ingot, carrying out solution treatment on the cast ingot, extruding into a plate, and then carrying out multi-pass rolling treatment and aging heat treatment regulation. The magnesium alloy plate has a phase structure of a dispersed Mg17Al12 phase, the corrosion behavior of the magnesium alloy plate is typical filiform corrosion characteristics, and compared with traditional pitting corrosion, the magnesium alloy plate has the advantages of being small in corrosion depth and small in destructiveness. The magnesium alloy plate provided by the invention has excellent mechanical properties and corrosion resistance.

The invention belongs to the technical field of titanium alloy materials, and discloses a Ti65 alloy bar for eliminating microtexture and a manufacturing method thereof, and the manufacturing method comprises the following steps: carrying out homogenization treatment and cogging forging on an alloy ingot, heating an alloy forging stock to 30-55 DEG C above a beta phase transformation point, and carrying out one-heating-number primary upsetting and drawing deformation; the alloy forging stock subjected to primary upsetting deformation is heated to 5-15 DEG C above the beta phase transformation point, and secondary upsetting deformation of 1-2 heating numbers is carried out; the alloy forging stock subjected to secondary upsetting deformation is heated to 75-30 DEG C below the beta phase transformation point, and third upsetting deformation with 6-8 heating numbers is carried out; and shaping the alloy forging stock subjected to the three times of upsetting and drawing deformation at 75-30 DEG C below the beta phase transformation point, and then carrying out solution treatment and aging treatment to obtain the Ti65 alloy bar with the microtexture eliminated. By optimizing the forging process and parameters, micro-textures and strong deformation textures in the alloy structure are basically eliminated.

The invention relates to a preparation method of beryllium-copper alloy. The preparation method comprises the following steps: (S1) accurately weighing the following raw materials by mass: copper, beryllium, copper-yttrium alloy, copper-titanium alloy, copper-manganese alloy and nano ytterbium powder; (S2) the raw materials are added into a vacuum induction furnace, the temperature is increased to 1400-1600 DEG C under the inert atmosphere, after the raw materials are completely molten, a covering agent is spread on the melt, smelting, standing and slagging-off are conducted under the stirring condition, the melt is poured into a mold under the condition of 1100-1200 DEG C, and a beryllium copper alloy ingot is obtained; and (S3) the beryllium-copper alloy ingot is subjected to face milling treatment, solution treatment, cold machining deformation treatment and aging treatment in sequence, and the product beryllium-copper alloy is obtained. A small amount of metal elements are added, aging treatment is carried out under the microwave condition, and then slow cooling is carried out at the constant cooling rate, so that the overaging phenomenon can be remarkably inhibited, the hardness of the alloy is improved, and meanwhile, the mechanical property, especially the stress relaxation resistance, is also improved.

The invention discloses a production process of a high-strength anti-corrosion power transmission pole cross arm. The production process comprises the following steps that 1, an anti-SCC aluminum alloy is selected; a trace amount of Sc is added to refine grains, so that the corrosion resistance is improved; cold machining is avoided, and a warm forming process is adopted; 2, aluminum alloy ingot smelting and hot extrusion forming are carried out; 3, T6 solid solution treatment is carried out to improve the strength; 4, the five-axis CNC machining center conducts structural topology optimization cutting; the surface roughness Ra of a key bearing part is less than or equal to 0.8 mu m; an ultrasonic-assisted drilling technology is adopted; step 5, micro-arc oxidation; and step 6, ultrasonic flaw detection and infrared thermal imaging. The 5083-H116 aluminum alloy is combined with Sc microalloying, precision machining and micro-arc oxidation technologies, so that the stress corrosion resistance is improved by 3 times, the fatigue life is prolonged by 2-3 times while the tensile strength of the power transmission pole cross arm is kept to be larger than or equal to 350 MPa, 5000-hour salt mist protection and 30-year maintenance-free are achieved, and the service life of the power transmission pole cross arm is prolonged. The problems of corrosion cracking, short fatigue life and insufficient durability of a traditional product in a harsh environment are comprehensively solved.

The invention relates to the technical field of magnesium secondary battery electrode materials, in particular to a microalloyed magnesium alloy negative electrode material as well as a preparation method and application thereof, and the microalloyed magnesium alloy negative electrode material comprises the following components in percentage by mass: 0.01-2.0 wt.% of Gd and / or 0.01-2.0 wt.% of Ce, 0.01-1.0 wt.% of Mn and the balance of Mg. The preparation method comprises the following steps: weighing the raw materials according to the component proportion of the microalloyed magnesium alloy negative electrode material, smelting the raw materials, pouring, and carrying out air cooling solidification to obtain a cast ingot; the raw materials comprise pure Mg, an Mg-Gd intermediate alloy and an Mg-Mn intermediate alloy, or the raw materials comprise pure Mg, an Mg-Ce intermediate alloy and an Mg-Mn intermediate alloy; and sequentially carrying out solution treatment, extrusion treatment, rolling treatment and annealing treatment on the cast ingot to obtain the microalloyed magnesium alloy negative electrode material. The material is excellent in long cycle stability, low in overpotential, environment-friendly and low in cost.

The invention discloses a 1500MPa-grade titanium alloy plate and a preparation method thereof, and belongs to the technical field of titanium alloys. The 1500MPa-grade titanium alloy plate disclosed by the invention is prepared from the following components in percentage by mass: 3.0 to 5.0 percent of Al, 4.0 to 6.0 percent of Mo, 3.0 to 5.0 percent of V, 1.0 to 3.0 percent of Cr, 1.0 to 3.0 percent of Nb, 2.0 to 5.0 percent of Zr, 0.5 to 2.0 percent of Fe and the balance of Ti and inevitable impurities. The preparation method comprises the following steps that smelting raw materials are selected according to the components of the titanium alloy plate, then weighing, burdening and smelting are conducted, the smelting temperature is controlled to be 2300-2700 DEG C, an alloy ingot is obtained, the alloy ingot is heated and then subjected to rolling deformation, the titanium alloy plate is obtained, finally, the titanium alloy plate is placed in a heating furnace to be subjected to solution treatment and aging treatment, and the titanium alloy plate is obtained after air cooling. The strength of the prepared alloy plate can reach 1500 MPa or above, meanwhile, the ductility is kept at 5% or above, and the alloy plate has very good application prospects.

A tailor-welding, spinning and variable-wall-thickness forming method for a large-sized extension section of a liquid propellant rocket engine, which belongs to the technical field of metal forming. The method comprises: performing laser numerical control machining on a GH3044 superalloy to obtain two chord-tangent circles; performing electron beam welding to obtain a complete circle; performing a vacuum solid solution treatment; performing pre-forming to obtain a shallow dish shape; performing a vacuum solid solution treatment; assembling a variable-wall-thickness flat blank and a spinning mandrel of a first spinning die, and then performing spinning on a spinning machine to form a curved generatrix variable-wall-thickness blank part; performing a vacuum solid solution treatment; and assembling the curved generatrix variable-wall-thickness blank part and a spinning mandrel of a second spinning die, and then performing spinning on the spinning machine to form a curved generatrix variable-wall-thickness part. The present invention is mainly used for the manufacturing of an ultra-large-sized GH3044 extension section of the liquid propellant rocket engine, which has a diameter of 1200 mm and a length of 1500 mm, and the product precision reaches a wall thickness tolerance of + / -0.05 mm for each point and a surface profile of ≤3 mm.

The invention discloses a control method and a preparation method for quenching deformation of a die casting, and the control method comprises the following steps: carrying out partitioned cooling on the die casting subjected to solution treatment to obtain the actual deformation of the cooled die casting; a simulation model is established, and the simulation deformation of the die casting is obtained; the simulation deformation amount is compared with the actual deformation amount; carrying out simulation optimization on the partitioned quenching cooling process of the die casting on the basis of the corrected model; performing quenching cooling test on the die casting based on the simulated and optimized partition quenching cooling process, and correcting the partition quenching cooling process based on the result of the cooling rate; performing partition quenching cooling on the die casting on the basis of the corrected partition quenching cooling process, obtaining corrected deformation of the die casting after quenching cooling, and comparing the corrected deformation with design size data of the die casting; and constraint simulation analysis is carried out on the position with the deformation degree larger than 1mm, and a constraint mode with the minimum deformation degree is obtained.

The invention relates to the technical field of metal material treatment, and particularly provides an aluminum alloy surface protective coating and a preparation method thereof. The method comprises the following steps: after a to-be-treated aluminum alloy sample is cleaned and no residual liquid exists, sequentially carrying out solution treatment and aging treatment on the aluminum alloy; and immersing the obtained aluminum alloy sample into a conversion film solution, carrying out deposition treatment, and drying to obtain the aluminum alloy sample with the surface protective coating. By combining solid solution treatment and aging treatment with a conversion film process, the wear resistance of the surface of the aluminum alloy is improved, the aluminum alloy is suitable for a higher friction environment, the adhesive force and corrosion resistance of a film layer are improved through multiple treatments of solid solution, aging and the conversion film, and the service life of the aluminum alloy is prolonged.

The invention discloses composite powder with a core-shell structure and a preparation method of the composite powder. The preparation method comprises the steps of pretreatment, titanium dioxide coating treatment, plating solution treatment and silver coating treatment. The titanium dioxide coating treatment comprises the following steps: after ultrasonically stirring butyl titanate and absolute ethyl alcohol, adding dilute acid to prepare a reaction solution; nickel powder is added into the reaction liquid for a constant-temperature reaction, and titanium dioxide coated nickel powder is obtained after the reaction; the plating solution treatment comprises the steps that titanium dioxide coated nickel powder, a solvent and a dispersing agent are subjected to ultrasonic stirring and then subjected to constant-temperature stirring, a reducing agent and a sodium hydroxide solution are added, and a dispersed solution is obtained after reaction; the silver coating treatment comprises the following steps: ultrasonically stirring and dispersing silver nitrate and deionized water, and then adding a complexing agent for complexing reaction; and pouring into the dispersion solution under a stirring state, and reacting to obtain the composite powder. According to the method, the stability of the nickel powder and the compactness of the coating layer in the preparation process of the composite powder can be effectively improved, and then the conductivity of the composite powder can be improved.

The invention relates to the technical field of aluminum alloy conductor preparation, in particular to a preparation process of a light alloy conductor for a new energy automobile. The preparation process of the light alloy conductor for the new energy automobile comprises the following steps: firstly, preparing matrix aluminum alloy microspheres and graphene modified aluminum alloy microspheres; the matrix aluminum alloy microspheres and the graphene modified aluminum alloy microspheres are placed in a double-helix conical mixer according to the mass ratio of (11-16): 1 to be evenly mixed to obtain mixed alloy powder, and the mixed alloy powder is placed in a forming mold to be subjected to hot isostatic pressing treatment; and after cooling to room temperature, carrying out solution treatment, artificial aging treatment, first-stage wire drawing processing, first-stage intermediate annealing, second-stage wire drawing processing, second-stage intermediate annealing, third-stage wire drawing processing, third-stage intermediate annealing, fourth-stage wire drawing processing, fourth-stage intermediate annealing and final annealing treatment to obtain the finished light alloy conductor. The high-strength flexible cable has excellent electric conductivity and also has relatively good strength and deflection resistance.

The invention provides a light high-strength high-temperature-resistant high-entropy alloy as well as a preparation method and application thereof, and relates to the technical field of high-temperature alloys. The light-weight high-strength high-temperature-resistant high-entropy alloy is composed of seven elements of Al, Cr, Mo, Nb, Ni, Ti and V. The chemical components are AlaCrbMocNbdNieTifVg, 10 < = a < = 15, 10 < = b < = 20, 5 < = c < = 10, 10 < = d < = 20, 5 < = e < = 10, 5 < = f < = 10, 30 < = g < = 40, and a + b + c + d + e + f + g = 10. The light high-strength high-temperature-resistant high-entropy alloy is prepared through raw material weighing, grinding and ultrasonic cleaning in the raw materials, vacuum degree in smelting and casting, argon adjustment, multiple times of smelting and electromagnetic stirring and solution treatment. The light high-strength high-temperature-resistant high-entropy alloy has excellent compressive strength, yield strength and hardness at room temperature and high temperature; the preparation method is simple and easy to operate, green and environment-friendly, low in cost, short in process, high in efficiency and beneficial to industrial large-scale production and popularization.

The invention relates to duplex stainless steel, in particular to high-nitrogen duplex stainless steel and a preparation method of a strip of the high-nitrogen duplex stainless steel. The duplex stainless steel comprises the following chemical components in percentage by mass: 0.15 to 0.35 percent of N, 24.5 to 26.5 percent of Cr, 8.0 to 11.0 percent of Ni, 3.4 to 3.9 percent of Mo, 1.5 to 3.5 percent of Mn, less than or equal to 0.001 percent of C, less than or equal to 0.20 percent of S i, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S and the balance of Fe. The preparation method comprises the steps of smelting, coping, segmented heating forging, coping hot rolling, solution treatment, third-time cold rolling, degreasing and continuous annealing. According to the invention, the N content is increased to 0.15-0.35%, so that the corrosion resistance of the duplex stainless steel is improved, and the plasticity, weldability and toughness of the nitrogen-containing stainless steel are improved; and meanwhile, in the forging and hot rolling processes, the modes of preheating and then rapid temperature rising and heating and rapid temperature rising and heating are adopted, and the temperature is controlled, so that the retention time of a brittle phase at the temperature of 600-1000 DEG C in the forging and hot rolling processes is shortened, the brittle phase precipitation amount on the surface of the intermediate billet is reduced, and the problem of cracking in the forging and hot rolling processes is further avoided.

The invention discloses a heat treatment process for a high-elongation aluminum alloy plate, and particularly relates to the field of aluminum alloy material processing, and the heat treatment process comprises the following specific heat treatment steps: S1, component design preparation, S2, low-temperature solution treatment, S3, pre-stretching optimization and S4, graded aging. According to the invention, through a synergistic process of combining low-temperature solution treatment, pre-stretching optimization and graded aging, the contradiction between the strength and the elongation of the aluminum alloy plate is successfully solved, the strength of the aluminum alloy plate is maintained while the elongation of the aluminum alloy plate is remarkably improved, a high-performance aluminum alloy material solution is provided for lightweight of automobiles, and the application prospect is wide. Wide market prospects and industrial application values are realized; and although the steps of pre-stretching and grading aging are added, the energy consumption is saved by reducing the solid solution temperature, and the comprehensive production cost is equivalent to that of a traditional process.

The invention relates to the technical field of metal processing, and discloses a production method of an ER2209 austenite ferrite duplex stainless steel welding wire, the ER2209 austenite ferrite duplex stainless steel welding wire comprises an adopted vacuum induction melting furnace and a liquid storage tank, the outer side of the vacuum induction melting furnace is provided with a protective shell, one side of the liquid storage tank is fixedly connected with a conveying pump, and the other side of the liquid storage tank is fixedly connected with a vacuum pump. A cooling assembly is arranged in the protective shell. The preparation method comprises the following steps that S1, raw materials are prepared and smelted; s2, cooling the vacuum induction melting furnace; s3, forging is conducted; s4, hot rolling and solution treatment; s5, acid pickling and surface treatment; s6, cold drawing and intermediate annealing; s7, surface copper plating and finish drawing; and S8, winding and packaging. In the acid pickling process of the wire rod, the oxidation degree of the wire rod is detected, meanwhile, the concentration of the acid pickling solution is adjusted according to the actual situation, and the situation that the surface of the wire rod is excessively corroded or is not thoroughly cleaned due to the fact that the concentration of the acid pickling solution is improper is prevented.

The invention belongs to the technical field of aluminum alloy material preparation, and particularly relates to a preparation method of an aluminum alloy reflector bar, which comprises the following steps: sequentially carrying out high-temperature extrusion processing, low-temperature extrusion processing, extreme high-temperature solution treatment and aging treatment on an aluminum alloy cast ingot to obtain the aluminum alloy reflector bar; the heating temperature of the high-temperature extrusion processing is 500-560 DEG C; the heating temperature of the low-temperature extrusion processing is 300-350 DEG C; the solid solution temperature of the extreme high-temperature solid solution treatment is 560-580 DEG C; the cost is reduced, and the performance of the aluminum alloy bar is improved.

The invention belongs to the field of conductive wrought aluminum alloys, and discloses a composite treatment method for synchronously improving conductivity and strength of a Fe-rich wrought aluminum alloy. The composite treatment method comprises the following steps: 1) melting the Fe-rich wrought aluminum alloy, and then carrying out microalloying treatment on B, Sr, Er and Bi; or according to the components and the content of the conductive aluminum alloy, the raw materials of pure aluminum, Fe intermediate alloy, Si intermediate alloy and B intermediate alloy of the conductive aluminum alloy are melted, then Mg intermediate alloy, Sr intermediate alloy, Er intermediate alloy and pure Bi are added, and even mixing and standing are conducted; 2) mechanical vibration casting; 3) diffusion annealing and rolling treatment; (4) solution treatment; (5) pre-aging treatment and variable-temperature rolling are conducted; and 6) artificial aging treatment. According to the method, the Fe impurity tolerance of the conductive aluminum alloy is improved, Fe-rich phase modification and refinement in the aluminum alloy are achieved, the conductivity of the alloy is remarkably improved, meanwhile, the alloy strength is improved, and regeneration and recovery of the conductive aluminum alloy are facilitated.

A method for preparing a titanium alloy by additive manufacturing, relating to the technical field of material preparation. The technical solution used is: first, eliminating holes in a printing material by means of additive manufacturing and hot isostatic pressing processes; and then on the basis of the critical temperature and time for grain growth and phase transformation, carrying out high-temperature short-time solution treatment on the printing material, and carrying out aging treatment on a sample obtained by means of the solution treatment and water cooling, to optimize the material structure. The method for preparing a titanium alloy by additive manufacturing overcomes the technical barriers of printing holes, lath coarsening and grain boundary α phase that are inevitable in traditional printing processes, hot isostatic pressing and traditional heat treatment, does not require fine optimization of the printing and hot isostatic pressing processes, and can conveniently and efficiently obtain an additively manufactured titanium alloy having an ultrahigh fatigue strength, greatly reducing costs and improving efficiency. Also provided is an additively manufactured titanium alloy.

This invention provides a method for high-strength aluminum-lithium alloy friction stir deposition additive manufacturing and multi-stage heat treatment, relating to the technical field of aluminum alloy friction stir deposition additive manufacturing. The method includes: fixing a substrate and placing a stirring head in the area to be added to the substrate; loading a base material into the stirring head; starting the program, with a push rod slowly pushing the aluminum-lithium alloy base material to the area to be added; when the aluminum-lithium alloy base material reaches a thermoplastic state, the stirring head advances to complete deposition; lifting the stirring head and adjusting the height of the end face of the stirring head relative to the deposited layer to perform reverse-direction additive manufacturing to complete deposition; repeating the deposition steps layer by layer upwards until the height of the deposited layer reaches the target height to obtain a friction stir deposition additive component; subjecting the friction stir deposition additive component to low-temperature solution treatment and a first aging treatment, followed by high-temperature solution treatment and a second aging treatment to obtain a high-strength aluminum-lithium alloy, effectively solving the problems of difficult forming and easy cracking of ultra-large and moderately complex aluminum-lithium alloy structural parts.

The invention relates to the technical field of aluminum alloy casting, and discloses a rare earth alloying modified 3102 aluminum alloy semi-solid casting method which comprises the following steps: S1, preparing ingredients: firstly preparing a raw material of a 3102 aluminum alloy and then preparing a rare earth element, S2, smelting: sequentially putting the raw material of the 3102 aluminum alloy into smelting equipment according to a sequence, S3, adding the rare earth element, and S4, casting. After the 3102 aluminum alloy raw material is smelted, S4, preparing semi-solid slurry, namely, cooling and stirring a smelted solution through stirring equipment, and adding a grain refiner while stirring until the smelted solution is formed into the semi-solid slurry, S5, performing die casting or injection molding, injecting the semi-solid slurry into a die casting mold of die casting equipment, and S6, cooling and demolding. And S7, heat treatment is conducted, specifically, the demolded casting is subjected to solution treatment, and a protective atmosphere is added. The yield strength and tensile strength of the alloy are improved through mechanisms such as solid solution strengthening, copper and aluminum can form an intermetallic compound to achieve dispersion strengthening, hardness increasing and wear resistance improving, silicon is beneficial for reducing melt viscosity and improving fluidity, and the alloy body performance is further improved through mixing of multiple materials, and the alloy is suitable for being used in various scenes.