23 results about "Superplasticity" patented technology

The invention relates to the technical field of titanium alloy pipe manufacturing, and particularly discloses a preparation method of a titanium alloy thin-walled pipe with superplasticity, comprising the following steps: S110, annealing a titanium alloy bar below a phase transformation point in a vacuum annealing furnace; s120, the annealed bar material is subjected to reciprocating extrusion treatment; s130, the bar subjected to reciprocating extrusion treatment is subjected to forward extrusion to form a pipe blank; s140, the pipe blank is subjected to superplastic bulging treatment; s150, after superplastic bulging is finished, heat preservation is stopped, and inert shielding gas continues to be blown in for cooling to the room temperature; and S160, stress relief annealing is conducted on the thin-walled pipe obtained after superplastic bulging, and the titanium alloy finished pipe with superplasticity is obtained. According to the method, the plasticity of the titanium alloy pipe is remarkably improved through reciprocating extrusion and superplastic bulging, the deformability is improved, meanwhile, the grain size is regulated and controlled, and preparation of the high-performance and high-size-precision thin-wall pipe is achieved.

This invention provides a low-alloy-content fine-grained superplastic magnesium alloy and its preparation method. The magnesium alloy, by mass percentage, comprises: Al 0.6-1.1%, Ca 0.2-0.4%, Mn 0.3-0.5%, unavoidable impurities ≤0.05%, and the balance being Mg. The preparation method of the magnesium alloy mainly includes: (1) casting the magnesium alloy melt to obtain an ingot; (2) homogenizing the ingot and then extruding it; (3) performing multiple low-temperature variable extrusion rate equal-diameter angular extrusion treatments. Without adding rare earth elements, the low-alloy-content fine-grained superplastic magnesium alloy prepared by this invention has a uniform fine-grained structure and excellent high-temperature tensile properties. The alloy exhibits an elongation >320% at 325℃. This invention realizes the preparation of low-alloy-content rare-earth-free superplastic magnesium alloys, reduces processing temperature, eliminates the solution treatment before equal-diameter angular extrusion and the annealing step after equal-diameter angular extrusion, and improves alloy performance while contributing to the economical production of superplastic magnesium alloys.

A non-heat treated cold rolled super plastic low density steel sheet comprising by weight 0.12% ≤ carbon ≤ 0.5%,3% ≤ manganese ≤ 9%,5% ≤ aluminum ≤ 9%,0% ≤ silicon ≤ 2%,0% ≤ phosphorus ≤ 0.1%,0% ≤ sulfur ≤ 0.03%,0% ≤ nitrogen ≤ 0.1%, 0 ≤ niobium ≤ 0.03%, 0 ≤ titanium ≤ 0.2%, 0% ≤ molybdenum ≤ 0.5%, 0% ≤ chromium ≤ 0.6%, 0% ≤ copper ≤ 2.0%, 0% ≤ nickel ≤ 3.0%, 0% ≤ calcium ≤ 0.005%, 0% ≤ boron ≤ 0.01%, 0% ≤ Magnesium ≤ 0.005%, 0% ≤ Zirconium ≤ 0.005%, 0% ≤ Cerium ≤ 0.1%,and the balance including iron and unavoidable impurities, the steel sheet having a microstructure comprising, in area fraction, 50% to 100% ferrite and 0% to 50% of austenite.

The invention discloses a method for improving superplasticity of a TC4 titanium alloy laser welding joint, relates to the field of alloys, and aims to solve the problem that the superplasticity of an existing TC4 titanium alloy laser welding joint is poor. The method comprises the steps that TC4 titanium alloy powder and Yb2O3 powder are mixed, ball-milled, subjected to laser welding and then subjected to superplastic forming; the high-temperature dynamic environment of a laser molten pool is utilized, Yb2O3 directly participates in the nucleation and growth process of weld grain, and beta grains are fundamentally refined (not repairing coarse grains after welding); and the extra cost and the deformation risk of post-welding treatment are avoided.

This invention discloses a high-temperature titanium alloy phase change superplastic diffusion bonding method, belonging to the field of material welding technology. The bonding method is as follows: the surface of the high-temperature titanium alloy sample to be welded is pretreated and chemically etched sequentially, followed by magnetron co-sputtering to sputter a layer of iron-nickel composite film onto the surface, obtaining an intermediate sample. The intermediate sample is then annealed to obtain a sample to be welded with the iron-nickel composite film layer; the iron-nickel composite film accounts for 0.55%~0.80% of the mass of the high-temperature titanium alloy sample; the mass ratio of iron to nickel in the iron-nickel composite film is (70:30)~(90:10); the sample to be welded with the iron-nickel composite film layer is then welded through multiple cycles of heating and cooling within a preset temperature range using a phase change superplastic diffusion process. This phase change superplastic diffusion bonding method solves the technical problems of low efficiency and unstable mechanical properties of welds in traditional isothermal diffusion welding.

The invention is applicable to the technical field of metal plastic forming dies, and provides a cup-shaped part superplastic positive and negative gas bulging forming die which comprises a movable die and a static die, a cup-shaped molded surface is arranged at the top of the static die, a reverse pre-forming molded surface is arranged at the bottom of the movable die, a movable die sealing ring is arranged on the lower surface of the movable die, and a reverse pre-forming molded surface is arranged on the lower surface of the movable die. A static mold sealing ring is arranged on the upper surface of the static mold; a movable mold air hole is formed in the side wall of the movable mold, and a static mold air hole is formed in the side wall of the static mold. According to the device, positive and negative bidirectional active controllable gas expansion forming is firstly carried out on the upper cavity, so that the wall thickness uniformity of the deep-cavity cup-shaped part can be remarkably improved, the filling capacity of a complex structure is enhanced, wrinkling and cracking are effectively inhibited, and the material utilization rate and the quality of a formed part are improved.

The invention relates to superplastic austenite-based dual-phase light steel and a preparation method thereof, belongs to the technical field of light steel, and solves one of the problems of low elongation, poor structure stability and low industrial efficiency of high-aluminum light steel in high-strain-rate superplastic forming in the prior art. The superplastic austenite-based dual-phase light steel comprises the following components in percentage by mass: 0.3%-0.35% of C, 28.0%-36.0% of Mn, 7.0%-9.0% of Al, 0.8%-1.0% of Nb, 0.8%-1.0% of V, 0.8%-1.0% of Mo, 0.8%-1.0% of W, less than 0.03% of P, less than 0.01% of S and the balance of Fe. And the balance of Fe and inevitable trace impurities. The austenite-based dual-phase light steel prepared by the invention has good superplasticity.

The application belongs to the technical field of steel metallurgical material, and relates to a short-flow production method of superplastic thin strip steel and the superplastic thin strip steel. Molten steel is cast into a thin strip with a thickness of 2-5 mm by a double-roller thin strip continuous casting machine; the thin strip is naturally air-cooled to 950-1050 DEG C after leaving the crystallization roller, and then hot-rolled at a temperature of 850-950 DEG C with a reduction of 20-50%. The hot-rolled steel strip is cooled at a cooling speed of not less than 50 DEG C / s. The cooled thin strip is coiled at a temperature of 300-350 DEG C, and immediately water-cooled after coiling to obtain a finished steel coil. The yield strength of the final thin strip steel is 700-865 MPa, the tensile strength is 1024-1078 MPa, the elongation after fracture is 30-36%, and the product of strength and plasticity is 31-39 GPa%. The application realizes the super-high plasticity high-strength steel in a super-short flow and super-low cost mode. The process route of the application is short, efficient and low in cost, and is convenient for the industrialization and industrial application of advanced high-strength steel.

The application provides a method for preparing Au-Ag multistage nano optical layer on the surface of various rigid materials. The method stacks porous anodic aluminum oxide / polishing template, polished Au-Ag alloy and mechanically / chemically treated rigid material in sequence, and after heating, pressurizing and pressure maintaining, the Au-Ag alloy is filled into the micro-holes of the template to form nanowire or mirror layer on one side, and is embedded into the microstructure on the surface of the rigid material to realize riveting on the other side; after cooling, the template is removed, and the Au-Ag primary nanowire array structure or mirror layer structure on the surface of the rigid material is prepared. The primary nanowire array structure on the surface of the material is subjected to etching treatment, secondary nanopores are constructed on the surface, multistage nano structure is formed, and the optical layer is obtained. The process flow of the application is simple, the experimental period is short, the electroplating process is not needed, the production process is green, environment-friendly and pollution-free, the controllability of the multistage nano structure is strong, and the Au-Ag multistage nano structure array, mirror layer and other optical layers can be formed on the surface of various rigid materials.

An un-heat treated cold rolled superplastic high manganese low density steel sheet comprising: 0.12% ≤ carbon ≤ 0.5%, 12% ≤ manganese ≤ 20%, 5% ≤ aluminum ≤ 9%, 0% ≤ silicon ≤ 2%, 0% ≤ phosphorous ≤ 0.1%, 0% ≤ sulfur ≤ 0.03%, 0% ≤ nitrogen ≤ 0.1%, 0 ≤ niobium ≤ 0.03%, 0 ≤ titanium ≤ 0.2%, 0% ≤ molybdenum ≤ 0.5%, 0% ≤ chromium ≤ 0.6%, 0% ≤ copper ≤ 2.0%, 0% ≤ nickel ≤ 3.0%, 0% ≤ calcium ≤ 0.005%, 0% ≤ boron ≤ 0.01%, 0% ≤ magnesium ≤ 0.005%, 0% ≤ zirconium ≤ 0.005%, 0% ≤ cerium ≤ 0.1%, the balance comprising iron and unavoidable impurities, said steel sheet having a microstructure comprising 45% to 90% ferrite and 10% to 55% austenite in area fraction, said austenite having an average grain size of 0.5 microns to 25 microns, and a residual austenite grain having an aspect ratio of 1 to 4.5.

The application belongs to the field of amorphous alloy preparation, and particularly relates to a titanium-based amorphous alloy which can be used for superplastic forming. a Er b Cr c Ni d Si e Be f ; wherein a represents the atomic percentage of Ti, 55<=a<=65; b represents the atomic percentage of Er, 9<=b<=13; c represents the atomic percentage of Cr, 15<=c<=22; d represents the atomic percentage of Ni, 4<=d<=8; e represents the atomic percentage of Si, 0<=e<=3; f represents the atomic percentage of Be, 0<=f<=8; and the sum of a, b, c, d, e and f is 100. The titanium-based amorphous alloy has a large supercooled liquid phase region, is not easy to crystallize when heated to the supercooled liquid phase region, and has superplasticity in the supercooled liquid phase region, so that the amorphous alloy is convenient to process and form.

This invention relates to the field of superplastic forming, and particularly to a method and apparatus for ultrasonic vibration-assisted superplastic forming of titanium alloys. Step S1: Select the vibration frequency of the ultrasonic generator according to the type, thickness, size, and forming shape of different titanium alloy sheets; adjust the vibration amplitude of the ultrasonic vibration; and generate a suitable ultrasonic vibration mode by changing the transducer or amplitude transformer. Adjust the heating temperature, heating time, and output pressure of the gas source system of the heating furnace. This invention incorporates ultrasonic vibration-assisted forming during the superplastic forming process of titanium alloys. Under the combined action of high-pressure argon gas and ultrasonic vibration, the high-temperature yield strength and flow stress of the titanium alloy sheet, which has reached superplasticity after heating, are reduced, shortening the superplastic forming cycle. Applying ultrasonic vibration during the forming process improves its mold adhesion, thereby increasing the contour accuracy of the formed parts and the yield rate of the finished products.

The application discloses a low-cost short-process preparation method of large complex components and belongs to the technical field of material processing. The method takes a cast alloy plate as an initial material, adopts friction stir welding to weld the initial material, and then adopts multi-pass friction stir processing (i.e. single-plate friction stir welding) on the large-size plate after welding to obtain a large-size component with integral superplastic forming capability, and adopts superplastic forming to prepare a large-size complex component, and the preparation process is shown in Fig. 1. The method can convert small cast alloy plates with cast defects and coarse structures into large-size fine-grain plates with integral superplastic forming capability, and finally forms large-size complex components. The method has the advantages of short preparation process, high material utilization rate, low cost and no limitation on the size of the initial plate, and can be applied to titanium alloys, steel, aluminum alloys, magnesium alloys, high-entropy alloys and other various alloys with superplasticity, and is favorable for industrial production and application of large-size complex components.

This invention belongs to the field of advanced metallic materials and powder metallurgy technology, specifically relating to a low-cost, multi-scale twinned synergistic deformation superplastic medium-heavy alloy and its preparation method. The preparation method includes melting the medium-heavy alloy using vacuum induction melting technology, then casting the molten medium-heavy alloy into an ingot and machining electrodes; preparing the electrodes into powder of a predetermined particle size; loading the powder into a casing, and after compaction, heating and degassing the casing until the required vacuum level is met, followed by sealing the casing; hot isostatic pressing of the sealed casing, and finally machining to remove the casing, yielding the superplastic medium-heavy alloy material. The superplastic medium-heavy alloy material prepared by this invention possesses multi-scale twins and an FCC matrix, with the FCC matrix accounting for more than 95% of the alloy, both ensuring good plasticity of the medium-heavy alloy material.

An ultra-plastic high-manganese low-density annealed cold-rolled steel comprising: 0.12% ≤ carbon ≤ 0.5%, 12% ≤ manganese ≤ 20%, 5% ≤ aluminum ≤ 9%, 0% ≤ silicon ≤ 2%, 0% ≤ phosphorus ≤ 0.1%, 0% ≤ sulfur ≤ 0.03%, 0% ≤ nitrogen ≤ 0.1%, 0 ≤ niobium ≤ 0.03%, 0 ≤ titanium ≤ 0.2%, 0% ≤ molybdenum ≤ 0.5%, 0% ≤ chromium ≤ 0.6%, 0% ≤ copper ≤ 2.0%, 0% ≤ nickel ≤ 3.0%, 0% ≤ calcium ≤ 0.005%, 0% ≤ boron ≤ 0.01%, 0% ≤ magnesium ≤ 0.005%, 0% ≤ zirconium ≤ 0.005%, 0% ≤ cerium ≤ 0.1%, the balance comprising iron and unavoidable impurities, the steel sheet having a microstructure comprising 45% to 90% ferrite and 10% to 55% austenite in area fraction, the average grain size of the austenite being 0.5 microns to 10 microns, and the aspect ratio of the residual austenite grains being 1 to 4.5.

The utility model relates to the technical field of aluminum alloy machining, and discloses an aluminum alloy plate superplastic stretching integrated forming die which comprises a lower die body and an upper die body used in cooperation with the lower die body. The two same heating structures are symmetrically arranged on the two sides of the upper die body, each heating structure comprises a conducting rod, an insulating sleeve, a connecting base and a sheath, the insulating sleeves are fixedly connected with the connecting bases, the connecting bases are elastically connected with the upper die body, the conducting rods are in threaded connection with the insulating sleeves, and the sheaths capable of shielding and protecting the conducting rods are arranged outside the insulating sleeves. The protective sleeve is elastically connected with the insulating sleeve, when the upper die body moves downwards to shape a plate, the conductive rod can abut against the plate, the electrified plate can emit heat to facilitate shaping, meanwhile, tearing of the plate can be restrained, and through the elastically-connected protective sleeve, after the upper die body and the lower die body are separated, the protective sleeve moves downwards to enable the lower end of the conductive rod to be stored in the abdomen, and therefore the plate can be conveniently shaped. The plate can be automatically connected with or disconnected from a power supply, the production efficiency is improved, and the workload is reduced.

The application discloses a kind of magnetic levitation block amorphous plate piece electromagnetic forming mechanism, system and method, belong to amorphous alloy forming field.Combining suspension forming and electromagnetic forming, workpiece is suspended in the whole forming process, avoid workpiece non-forming stage and solid die contact influence forming quality, and electromagnetic force stress is uniform, and double mechanism promotes the surface flatness of amorphous piece surface.Short pulse width operating current is heated to amorphous workpiece plate, ensure that in microsecond time scale complete amorphous workpiece plate temperature rise to over superplastic forming temperature interval, reduce the residence time of workpiece in high temperature zone, prevent workpiece relaxation crystallization, improve heating efficiency, substantially reduce power consumption, reach energy saving and environmental protection effect.Adjustable current pulse controls the strength and direction of magnetic field, can more quickly adjust the strength and direction of magnetic field, to more accurately control the suspension and movement of amorphous workpiece plate, not only help to improve forming precision and stability, also help to improve forming speed and production efficiency.

The present application relates to a kind of titanium matrix composite sheet with equiaxed structure and its heat treatment method, comprising the following steps: on the side of pure titanium plate and / or titanium alloy plate and titanium matrix composite sheet contact, coating stop solder, as the upper and lower cladding of sandwich titanium matrix composite sheet;The upper and lower cladding are placed in the uppermost layer and the lowermost layer of titanium matrix composite sheet or titanium matrix composite sheet stack respectively;The stack of the above-mentioned step is sealed after being placed as a whole, then vacuumizing, obtain the cladding with vacuum inside;The cladding with vacuum inside is heat treated, obtain the titanium matrix composite sheet with equiaxed structure;The titanium matrix composite sheet with equiaxed structure is diffusion connected;Its purpose is to realize the diffusion connection of high welding rate, reach the purpose of high quality weld and superplastic deformation capacity.

The invention belongs to the technical field of titanium alloys, and particularly relates to a superplastic titanium alloy and a forming process thereof. The titanium alloy comprises the following chemical components in percentage by mass: 4.0%-6.0% of Al, 3.0%-4.5% of V, 0.05%-0.30% of Sc, 0.5%-1.2% of Fe, 0.08%-0.16% of O and the balance of titanium and inevitable impurities, and the total amount is 100%. The Sc element is introduced into the alloy, and a multi-step composite process of aging treatment, low-temperature high-speed pre-forming and high-temperature low-speed accurate forming is matched, so that a superplastic deformation window moves to low temperature, and excellent superplastic performance is obtained.

The application discloses a superplastic forming expansion control method and device and electronic equipment, and belongs to the technical field of automobiles, and the method comprises the following steps: acquiring process parameter information; wherein the process parameter information comprises a die cavity volume, a sheet thickness, a forming temperature and forming pressure information; a target percentage of a superplastic forming degree of a sheet is set according to the process parameter information; the sheet in the die is heated, and after the temperature reaches a superplasticity temperature interval, the sheet in the die is inflated and pressurized according to the forming pressure, that is, superplastic expansion is started; the total amount of the gas inflated in the superplastic expansion is detected in real time during the superplastic expansion process, and the percentage of the superplastic forming degree at this time is calculated according to the total amount of the inflated gas, a sealing compensation amount and the process parameter information; when the target percentage is reached, the expansion is completed. The application monitors the forming amplitude of the sheet which is invisible in the superplastic forming process, and accurately controls the forming of the sheet in the die.

The invention discloses a uniform superplastic deformation method and device for a multi-pass stirring friction processed titanium alloy plate, and belongs to the technical field of titanium alloy superplastic deformation. The method comprises the following steps: firstly, optimizing friction stir processing parameters by adopting an iterative method combining numerical simulation and experiments to obtain optimized friction stir processing parameters, carrying out multi-pass friction stir processing on a titanium alloy plate by adopting the optimized friction stir processing parameters to obtain a fine-grain titanium alloy plate, and then carrying out superplastic deformation on the fine-grain titanium alloy plate to obtain the fine-grain titanium alloy plate. And in the deformation process, a plurality of cooling pipes and laser emitters are distributed along the multi-pass stirring friction machining area and the interface area to carry out micro-area rapid cooling and rapid heating regulation and control on the superplastic deformation process, so that uniform superplastic deformation of the titanium alloy plate subjected to multi-pass stirring friction machining is realized. According to the method for optimizing the stirring friction machining process parameters, the titanium alloy stirring friction machining process parameters are optimized in a numerical simulation mode, and the barrier that the stirring friction machining process parameters are selected through experience traditionally is broken through.

The application discloses a kind of low alloy content superplastic magnesium alloy containing nano two-phase and preparation method thereof, belong to metal material technical field.The low alloy content superplastic magnesium alloy described in the application is composed of the following components: Bi:0.5~2.0%, Sn:0.5~1.5%, Zn:0.5~1.0%, Mn:0.3~0.6%, unavoidable impurities≤0.05%, the balance is magnesium.The magnesium alloy obtained in the application is a low-alloyed multi-component alloy system, the total content of alloying elements≤4.0 wt.%, which does not contain rare earth elements.Compared with traditional medium-high alloying or rare earth strengthened magnesium alloy, the application does not significantly increase the cost of raw materials, forms a stable nano two-phase structure, does not significantly coarsen during high temperature tensile deformation, effectively pins the grain boundary, maintains a stable fine-grained structure, and realizes superplastic deformation with an elongation of≥400%.This technology breaks through the technical difficulties of traditional low-alloy-content magnesium alloy high-temperature superplasticity, and is conducive to obtaining a new type of extruded magnesium alloy material with high forming stability, good microstructure uniformity and suitability for continuous industrial production.