1483 results about "Solution treatment" patented technology

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 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 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 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 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 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.

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 alloy steel, in particular to a high-strength alloy steel plate and a machining process thereof. The method comprises the steps that S1, raw materials are smelted through a vacuum induction furnace and cast, and a steel ingot is obtained; s2, the steel ingot is subjected to homogenization treatment and forging treatment, and a plate is obtained; s3, uniformly mixing the modified cerium oxide, the modified graphene oxide-MOFs material and deionized water, performing ultrasonic treatment for 1-2 hours, then adding waterborne epoxy resin, a curing agent, a flatting agent and a defoaming agent, and uniformly mixing to obtain a corrosion-resistant coating; and S4, after the plate is subjected to solution treatment and aging treatment, the plate is coated with a corrosion-resistant coating, and after drying and curing are conducted, a corrosion-resistant coating is formed, and the high-strength alloy steel plate is obtained. The prepared high-strength alloy steel plate has excellent corrosion resistance and adhesive force, so that the service life of the high-strength alloy steel plate is prolonged.

The invention discloses a preparation method of a high-uniformity aluminum-lithium alloy ring piece, which comprises the following steps: cogging: heating a cast ingot to 460-490 DEG C, preserving heat, then carrying out multidirectional upsetting and drawing cogging, and punching a blank after upsetting and drawing to obtain an annular blank; the annular blank is heated to 410-440 DEG C and then subjected to heat preservation, and then the annular blank is subjected to annular rolling treatment; primary cold deformation: carrying out primary cold deformation treatment on the annular blank subjected to ring rolling treatment; solid solution is conducted, specifically, the annular blank subjected to primary cold deformation treatment is heated to 515-530 DEG C, then heat preservation is conducted, and then quenching is conducted; secondary cold deformation: carrying out secondary cold deformation treatment on the annular blank subjected to solution treatment; and the annular blank subjected to secondary cold deformation treatment is subjected to aging treatment. The prepared aluminum-lithium alloy ring piece is good in mechanical property in the tangential direction, the radial direction and the axial direction, small in elongation difference, good in structure uniformity and capable of better meeting actual requirements.

The invention relates to the field of material science and mechanical engineering, in particular to a high-strength aluminum-magnesium-silicon material bolt for a new energy automobile and a preparation method of the high-strength aluminum-magnesium-silicon material bolt. The bolt is made of an aluminum-magnesium-silicon alloy, and the alloy contains magnesium, silicon, manganese, iron, chromium, titanium, scandium, rare earth elements and the balance of aluminum. By optimizing the proportion of rare earth elements (yttrium, lanthanum and cerium) and scandium, grains are effectively refined, the tensile strength, the yield strength and the ductility are improved, and meanwhile the corrosion resistance and the fatigue resistance are enhanced. The preparation method comprises the steps that vacuum melting is combined with the ultrasonic-assisted technology, alloy elements are evenly distributed, and then the material structure is optimized through solution treatment at the temperature of 540 DEG C for 1.5 h and aging treatment at the temperature of 160 DEG C for 8 h. And the surface of the bolt is subjected to anodic oxidation and coated with a composite coating containing silicon dioxide nanoparticles, so that the wear resistance and the corrosion resistance are improved. Through verification, the bolt has the excellent performance that the tensile strength is larger than or equal to 490 MPa, the yield strength is larger than or equal to 440 MPa, the ductility is larger than or equal to 8.5%, and the salt spray test time is larger than or equal to 1500 hours, and the fastening requirement of the new energy automobile under the complex working condition is met.

The invention relates to the technical field of aluminum alloy heat treatment, and discloses a high-power tooth radiator aluminum alloy strengthening and toughening heat treatment method. Gradient temperature control solution treatment including at least two different temperature stages; step 2; carrying out electromagnetic auxiliary shape correction treatment, and applying an alternating magnetic field in the cooling process; step 3; the two-stage aging treatment comprises high-temperature first-stage aging and low-temperature second-stage aging; step 4; carrying out pulse type aging strengthening by adopting a periodic temperature fluctuation mode; step 5; and performing micro-arc oxidation surface treatment to generate an aluminum oxide layer in the electrolyte. Gradient temperature control solution treatment is adopted, a beta phase is fully dissolved, abnormal growth of crystal grains is inhibited, meanwhile, uniform nucleation of a GP region and dispersed distribution of a theta'phase are promoted through two-stage aging treatment, the strength and toughness of the alloy are improved, in addition, electromagnetic auxiliary shape correction and a composite residual stress elimination technology are combined, thermal stress deformation is effectively inhibited, residual stress is eliminated, and the performance of the alloy is improved. The size stability and the fatigue life are improved.

The invention discloses a method for improving gap sensitivity of GH2909 alloy and an alloy part, and relates to the technical field of aero-engine production, in particular to the method for improving gap sensitivity of GH2909 alloy and the alloy part, and the method comprises the following steps: carrying out solution treatment on a GH290 alloy sample at a selected temperature, and determining the heat preservation time according to the section thickness; after solution treatment and heat preservation are finished, a GH290 alloy sample is firstly subjected to furnace cooling, and a Laves phase is promoted to be evenly and dispersedly separated out in a short rod shape along a grain boundary; then discharging and air-cooling to room temperature, and then carrying out standard aging treatment; the alloy sample is a GH2909 alloy sample. According to the method disclosed by the invention, through a mode of controlled cooling and heating treatment, the intergranular dispersion precipitation behavior of a Laves phase can be promoted, so that the notch sensitivity of the GH2909 alloy is improved, and the endurance life of the alloy is prolonged.

The invention belongs to the technical field of aluminum alloys, and particularly relates to a high-toughness anti-fatigue aluminum alloy and a preparation method thereof. The alloy comprises the following components in percentage by mass: 0.6-1.4% of Mg, 0.6-1.4% of Si, 0.5-1% of Mn, 0.3-0.8% of Cu, 0.1-0.4% of Cr, 0.1-0.3% of Mo, less than or equal to 0.15% of Fe, less than or equal to 0.05% of Ti, less than or equal to 0.05% of other impurities and the balance of Al. In the alloy, the ratio of Mn to (Cr + Mo) is 2-5, and Cr + Mo is less than or equal to 0.4. The aluminum alloy is subjected to synergistic microalloying of elements Mn, Cr and Mo and three-stage homogenization treatment, then a high-density'core-shell 'structure dispersed phase is separated out, and the deformation structure regulation and control effect is effectively improved; through hot forging and multi-stage solution treatment, a mixed crystal structure in which sub-crystals and recrystallization coexist is obtained, the fatigue crack propagation rate is remarkably reduced, and the obdurability and the fatigue resistance are synchronously improved.

The invention discloses application of a double-channel powder feeding process in preparation of an aero-engine turbine disc blank, belongs to the technical field of aero-turbine disc manufacturing, and is characterized in that high-temperature alloy powder is subjected to gradient proportioning deposition through a double-channel system by an electric arc powder feeding additive process, and material gradient distribution is formed in disc center, transition and disc edge areas; meanwhile, dynamic mechanical deformation is applied to a new deposition layer in a high-temperature plastic state by adopting a synchronous micro-forging process, hot isostatic pressing treatment is carried out on a prepared turbine disc blank to eliminate internal defects, high-temperature homogenizing annealing is carried out in a vacuum furnace to improve the structure uniformity, and finally, the required mechanical property is obtained through solution treatment and aging treatment. The gradient accurate control of material components in different areas of the turbine disc is realized, the microstructure of a deposition material can be effectively improved, regulated and controlled in the manufacturing process, and metallurgical defects are reduced.

The invention discloses an Al-Mg-Zn aluminum alloy plate with excellent strong plasticity and light weight characteristics as well as a preparation method and application of the Al-Mg-Zn aluminum alloy plate. The alloy comprises the following components in percentage by mass: 5.0%-5.5% of Mg, 1.5%-2.0% of Zn, 0.4%-0.5% of Mn, 0.1%-0.3% of Cu, 0.15%-0.25% of Sc, 0.1%-0.15% of Zr, 0.05%-0.15% of Ag, less than or equal to 0.1% of impurities and the balance of Al. The density is not more than 2.63 g / cm < 3 >, the tensile strength is not less than 470 MPa, and the ductility is not less than 23%. The preparation method comprises the steps of high-purity raw material smelting and casting, two-stage homogenization, hot rolling, intermediate annealing, cold rolling, solid solution treatment and single-stage aging. Wherein the total pressing amount of hot rolling is 80-85%, the total pressing amount of cold rolling is 20-35%, and the single-stage aging time is 120-140 DEG C * 16-24 h. The microstructure of the alloy is characterized in that the average size of dispersed AlSc particles is smaller than or equal to 100 nm, the area fraction of deformed grains is larger than or equal to 70%, the average size of nanometer beta-AlMg and T-Mg (Al, Zn) composite precipitated phases is smaller than or equal to 20 nm, the number density is larger than or equal to 1 * 10 < m >, the area fraction of micron-order second phases is smaller than or equal to 0.5%, and the alloy is only formed by impurity Fe. According to the method, the traditional two-stage aging process is simplified, low density, high strength and high plasticity are synchronously improved, and the method is suitable for large-scale industrial application.

Disclosed in the present invention are a cast aluminum alloy, and a preparation method therefor and a use thereof. The cast aluminum alloy comprises Al, Si, Cu, Mg, Mn, Ti, Cr, Sr, and inevitable impurities. The impurities include Fe and other impurities except Fe. During preparation, the components are mixed, melted, and then refined to prepare an aluminum alloy cast ingot, and the aluminum alloy cast ingot is then subjected to a solid solution treatment, a quenching cooling, and an aging treatment. The aluminum alloy of the present invention can have the characteristics of a simple formulation, a high tolerance to impurity elements, especially iron, a low thermal cracking property, and a high heat fatigue resistance. The aluminum alloy can satisfy the equivalent or even higher grade use of a large amount of high-quality recycled aluminum alloys, the aluminum alloy itself can also be recycled, thereby reducing carbon emission; furthermore, the aluminum alloy can also be used at a relatively high service temperature, the formulation is simple, and the raw material cost is relatively low.

The invention relates to the technical field of alloy processing, and discloses a high-performance corrosion-resistant nickel-based alloy plate and a preparation method thereof, and the method comprises the following steps: raw material preparation, smelting treatment, casting treatment, hot rolling treatment, solution treatment, aging treatment and surface passivation treatment. According to the invention, when a composite acid system is adopted for passivation treatment, the concentration of chromium / molybdenum atoms in a passivation film is optimized and balanced due to the specific ratio of nitric acid to chromic acid, a chromium oxide provides a compact passivation barrier, and a molybdenum oxide endows the film layer with a self-repairing characteristic to synergistically inhibit pitting nucleation; meanwhile, nano titanium dioxide particles pretreated by silane are embedded into the passivation film in situ under the action of ultrasonic oscillation, organic pollutants adsorbed on a film layer can be decomposed by the photocatalytic characteristic of the nano titanium dioxide particles, the local corrosion effect of a battery caused by dirt coverage is avoided, and the performance of the battery is improved through double upgrading of components and the structure of the passivation film. And the alloy plate has excellent pitting corrosion resistance and fouling resistance in a chloride ion-containing medium.

The invention discloses a method for manufacturing an aluminum alloy thin-wall part through hot shape correction of a rubber bag after sheet metal forming. The method comprises the steps that firstly, an aluminum alloy thin-wall part blank is obtained through sheet metal forming; secondly, the blank is subjected to solution treatment; thirdly, the blank obtained after solid solution treatment is put into a refrigerator to be stored; fourthly, the rigid mold, the rubber bag and the like are installed on a press machine, overall heating is conducted, and the temperature is kept stable; fifthly, the blank obtained after solid solution is rapidly placed above a hot-state rigid mold, and positioning of the rigid mold and the blank is completed; 6, quickly closing the die, pumping hydraulic oil into the rubber bag, and increasing the pressure of the press machine to the set pressure; seventhly, the rubber bag extrudes the blank to enable the blank to be tightly attached to the rigid mold, and the mold temperature is transmitted to the blank; 8, under the combined action of high pressure and a thermal field, the aluminum alloy is subjected to aging strengthening and stress relaxation, and springback is reduced; 9, unloading the pressure of the rubber bag and the hydraulic machine; and 10, opening the press machine to take out the blank, and uniformly cooling in a cooling tool to obtain a thin-wall part finished product.

The invention relates to a continuous pulse current solution treatment method for additive manufacturing of nickel-based superalloy, and relates to the technical field of solution treatment for additive manufacturing of nickel-based superalloy. According to the main technical scheme, solution treatment is carried out in the mode that continuous pulse current treatment is applied to the additive manufacturing nickel-based superalloy, so that dissolving of harmful phases such as Lave in the additive manufacturing nickel-based superalloy is promoted, and the additive manufacturing nickel-based superalloy subjected to solution treatment is obtained. Compared with a traditional heat treatment process, the grain size in the additive manufacturing nickel-based superalloy subjected to solution treatment is smaller; the method is low in treatment temperature, short in treatment time, more efficient and more energy-saving, and meets the requirements of current industrial green sustainable development. Therefore, the invention provides a new method for further improving the comprehensive mechanical properties of the nickel-based superalloy manufactured by laser, electric arc and other additive manufacturing.

The invention discloses high-strength stainless steel for a wheel hub cover and a machining process of the high-strength stainless steel, and relates to the technical field of stainless steel machining. The specific processing technology comprises the following steps: weighing a stainless steel raw material, smelting under nitrogen pressurization, carrying out protective pouring to obtain a cast ingot, carrying out hot forging and hot rolling to obtain a hot-rolled plate, carrying out solution treatment and water quenching, sequentially carrying out multi-pass cold rolling and single-pass liquid nitrogen heat preservation cold rolling, annealing and aging treatment to obtain a stainless steel base material, and sequentially carrying out grinding, polishing, oil removal and acid activation to obtain the stainless steel plate. And then placing in an electroplating solution for electro-deposition of an alloy plating layer, cleaning after electro-deposition is finished, then carrying out laser cladding, finally carrying out heat treatment, and cutting a thin layer to obtain the high-strength stainless steel. Wherein cladding powder adopted for laser cladding comprises cobalt powder, chromium powder, nickel powder, aluminum powder, molybdenum powder, titanium powder, zirconium powder, nano carbon-nitrogen metal and tungsten carbide.

The invention relates to the technical field of stainless steel pipe production, and provides a stainless steel seamless steel pipe production process which comprises the following steps: step 1, raw material pretreatment: selecting a stainless steel pipe blank conforming to specifications, detecting internal defects through ultrasonic flaw detection, and cleaning the surface of the pipe blank by adopting a shot blasting machine; 2, tube blank heating, wherein the tube blank in the step 1 is placed in a medium-frequency induction heating furnace to be heated; thirdly, hot extrusion forming is conducted, specifically, the pipe blank in the second step is placed in an extruding machine with an annular die head, and an initial seamless steel pipe is formed; and 4, on-line solid solution treatment is conducted, specifically, the steel pipe in the step 3 is fed into a continuous solid solution furnace to be subjected to heat preservation for 30-60 seconds. By means of the multi-link collaborative optimization production technology, high-quality batch production of the stainless steel seamless steel pipe and flaw detection and surface cleaning in the raw material pretreatment stage are achieved, the pipe blank quality is guaranteed, sectional type heating and precise temperature control hot extrusion forming are achieved, and the structural integrity of the initial steel pipe is guaranteed.

The invention relates to the technical field of stainless steel production and manufacturing, and discloses a high-strength corrosion-resistant duplex stainless steel shaft forging method which comprises the steps of blank preparation, homogenization treatment, preheating treatment, multidirectional forging, interrupted cooling, solution treatment, aging treatment and surface finish machining. Uniformity of components in the blank and consistency of temperature distribution are guaranteed, a uniform microstructure basis is provided for subsequent forging, meanwhile, grains are refined through large deformation and multi-pass deformation in multi-directional forging, the strength and toughness of the shaft are improved, brittle phase formation is avoided, and the mechanical property is optimized; by interrupting cooling and solution treatment, controlling the cooling rate and heating parameters in real time, inhibiting harmful phase precipitation and optimizing the austenite-ferrite phase proportion, the shaft has high corrosion resistance, and by means of aging treatment, through a stable structure, the long-term durability of the shaft in a severe environment is guaranteed, and the corrosion weight loss and pitting corrosion risk are reduced.

The invention relates to a preparation method of an aluminum alloy welding wire and a high-strength 7xxx aluminum alloy welding wire prepared thereof.The preparation method comprises the following steps that S1, an aluminum alloy cast ingot is cast, and the aluminum alloy cast ingot comprises, by mass, 7%-8% of Zn, 2.0%-2.3% of Mg, 1.2%-1.8% of Cu, 0.2%-0.3% of Sc, 0.2%-0.3% of Zr, 0.1%-0.2% of Er and the balance Al; s2, the aluminum alloy cast ingot is subjected to multi-stage homogenization treatment, hot extrusion treatment, solution treatment, cold drawing, three-stage annealing treatment, cold drawing, three-stage annealing treatment, cold drawing, scraping cleaning and drying; multi-element microalloying, deformation and heat treatment are combined, precipitation strengthening, fine grain strengthening, strain strengthening, element diffusion and segregation and the like are fully considered, the formability of the welding wire is improved while the components of the welding wire are guaranteed, the technological method is simple, and operation is convenient.

The invention discloses a method for improving the crystallinity of a flexible covalent organic framework film through solvent heat treatment, and relates to the technical field of flexible functional film materials, and the method comprises the following steps: (1) synthesizing a COF film; (2) soaking the COF membrane in a triethylamine methanol solution to remove residual acidic components; and (3) putting the treated membrane into an acetic acid acetonitrile solution, and heating at 100 DEG C for 0.5-6 hours to improve the crystallinity of the membrane. According to the method, rearrangement of framework chain segments in a film body and enhancement of crystallinity are achieved through the mild two-step solution treatment step, the XRD diffraction intensity, the film body compactness and the structural orderliness of the COF film are remarkably improved, and meanwhile the flexibility and the mechanical property of an original film are kept.