78results about How to "High yield strength" patented technology

The utility model relates to hoisting tool technical field especially, it is a kind of lifting appliance assembly for diesel engine air cooler hoisting operation, its technical scheme includes lifting appliance, two groups are symmetrically provided to lifting appliance, and lifting appliance includes bottom plate and lifting plate, two groups of bottom plate are trapezoidal, the top of two groups of bottom plate is fixedly connected with lifting plate, hoist hole is set in the center of two groups of lifting plate, wear sleeve is set in the inside of multiple hoist holes, four corners of two groups of bottom plate are all set with mounting hole, the inside of multiple mounting holes is movably connected with fixed bolt, the side of two groups of lifting plate is fixedly connected with web, and the bottom end of web is fixedly connected with bottom plate, the bottom center of two groups of bottom plate is fixedly connected with spring, the bottom of two groups of springs is fixedly connected with buffer plate, the utility model has the advantages of convenient installation, reasonable structure, simple manufacture, low cost, simultaneously improve diesel engine air cooler hoisting operation work efficiency.

The invention relates to high-strength and high-ductility wear-resistant medium manganese steel and a preparation method thereof, belongs to the technical field of ferrous metallurgy, and aims to solve at least one of the problems that in the prior art, medium manganese steel is low in initial yield strength and difficult to meet the application requirements of high-wear-resistant parts, high plasticity and high wear resistance are difficult to consider, and long-term stable service is difficult to realize in a high-wear environment. The invention relates to wear-resistant medium manganese steel with high product of strength and elongation. The medium manganese steel comprises the following chemical components in percentage by mass: 0.35%-0.45% of C, 0.75%-1.25% of Si, 8.5%-11.5% of Mn and the balance of Fe and inevitable impurities. By optimizing the alloy design of the medium-manganese wear-resistant steel, the limitation of insufficient initial hardness of the traditional medium-manganese steel is overcome, so that the medium-manganese steel can have higher surface hardness in a non-work-hardening stage, thereby showing excellent wear resistance in the initial service stage of a structural part; and the problem of high wear rate caused by insufficient hardness of the traditional high / medium manganese steel at the initial stage of wear is effectively avoided.

The invention relates to a low-fault-energy micro-twin synergistic deformation cobalt-based alloy and a preparation method thereof, and belongs to the field of cobalt-based high-temperature alloys. According to the alloy, on the basis of Co-Al-W, Ti and Ta which are smaller than or equal to 4 wt% are added according to calculation of a first principle, and the stacking fault energy is controlled to be-95 mJ / m < 2 > to-89 mJ / m < 2 > (0K). Aiming at the defect of insufficient high-temperature plasticity of the gamma '-phase strengthened cobalt-based alloy, an electronic structure is accurately regulated and controlled through a first principle, intrinsic stacking fault energy is designed to reach an optimal negative value interval, a micro-twin mechanism is activated, dislocation slippage and micro-twin coordination is realized, and the problem of sudden plasticity drop caused by single deformation mechanism (dislocation slippage leading) and grain boundary weakening of a traditional alloy is solved; the high-temperature strength and the plasticity are synchronously improved.

The application discloses a nickel-based flux-cored wire for LNG storage tanks and a preparation method and application thereof, and belongs to the technical field of welding material flux-cored wires, and solves the problem that the mechanical properties and toughness of a weld after welding of an existing welding wire used for welding 9Ni steel plates are not matched with the 9Ni steel, thereby leading to low service life of the storage tank. The nickel-based flux-cored wire comprises a core and a cladding layer cladded outside the core; the cladding layer comprises, in percentage by mass, C: 0.015%, Cr: 14.5%-20.0%, S: 0.04%, P: 0.04%, and the balance of Ni and inevitable impurities; and the core comprises, in percentage by mass, Co: 0.5%-2.5%, Cr: 13.0%-18.0%, Si: 0.15%, Al: 0.01%-0.03%, Mn: 0.001%-0.02%, Mo: 15%-17%, W: 10%-20%, Fe: 10%-15%, and the balance of Ni and inevitable impurities.

This invention discloses a low-hydrogen flux-cored welding wire based on two-dimensional MXene surface self-assembly modification, its preparation method, and its application, belonging to the field of welding materials technology. The low-hydrogen flux-cored welding wire comprises a steel strip outer sheath and a flux core filled within it, the flux core being composed of metal alloy powder and modified composite flux core powder. Its preparation method includes: preparing a two-dimensional MXene colloidal dispersion using a chemical etching method; cationically modifying the insulating slag-forming powder; mixing the two and electrostatically self-assembling and coating them; after drying, mixing with the metal alloy powder; filling the steel strip; and rolling and drawing into shape. This invention constructs a three-dimensional continuous conductive network within the flux core through the MXene layer, improving arc stability; simultaneously, the MXene shell forms a physically water-blocking labyrinth, endowing the welding wire with ultra-low hydrogen characteristics; the active titanium released by the decomposition of MXene at high welding temperatures can refine the weld grains and improve mechanical properties. This welding wire can be widely used in automated gas-shielded welding processes for high-strength steel.

The invention discloses a Ni-Mo-Ti alloy reinforced by an ordered D0a / disordered HCP composite structure, which is characterized in that the element percentage composition expression of the Ni-Mo-Ti alloy is (Ni80 + yMo20-y) 100-xTix, x is greater than or equal to 1 and less than or equal to 10, y is greater than or equal to-5 and less than or equal to 5; the microstructure of the Ni-Mo-Ti alloy comprises a face-centered cubic FCC matrix and a strengthening phase embedded in the face-centered cubic FCC matrix, and the strengthening phase is a layered phase formed by compounding an ordered D0a area and a disordered HCP area. The invention further provides a preparation method of the Ni-Mo-Ti alloy reinforced by the ordered D0a / disordered HCP composite structure. The preparation method comprises the following steps of vacuum melting and vacuum casting; carrying out homogenization treatment; multi-pass rolling is conducted at the room temperature, the pass rolling amount is 2%-6%, and the total rolling amount is 60%-90%; and annealing heat treatment is conducted, specifically, the temperature of annealing heat treatment ranges from 910 DEG C to 1150 DEG C, and the time ranges from 1.5 min to 120 min. According to the Ni-Mo-Ti alloy strengthened by the ordered D0a / disordered HCP composite structure and the preparation method of the Ni-Mo-Ti alloy, through the strengthening effect of the ordered D0a and disordered HCP composite layer, the alloy material has ultrahigh strength and high plasticity at the same time, and the comprehensive mechanical property of the alloy material is improved.

This invention belongs to the field of copper alloy material design and preparation technology, and discloses a new process for efficiently designing high-performance copper-iron alloys. Based on the 5% Fe content vertical cross-sectional characteristics of the Cu-Fe-Si ternary phase diagram, the Si content is designed in stages (0-4%) to achieve targeted performance optimization. Combined with a three-stage heat treatment process of "homogenization-basic aging-gradient aging", a closed-loop system of "phase diagram design-preparation-detection-optimization" is constructed. Through precise composition control by EPMA and real-time feedback of mechanical properties, the problems of blind composition design and insufficient precipitation of strengthening phases in traditional processes are solved. The resulting alloy has excellent tensile strength, yield strength, and total elongation at break, with synergistic improvement in mechanical and magnetic properties, and a design efficiency improvement of more than 40%, making it suitable for electronic, mechanical and other fields.

The application relates to the technical field of ultrahigh-strength steel, and provides an ultrahigh-strength weather-resistant steel bar and a production method thereof.The production method of the ultrahigh-strength weather-resistant steel bar comprises the following steps: preheating waste steel, smelting the waste steel after preheating and smelting auxiliary materials in an electric arc furnace, controlling a smelting end point, transferring the molten steel after electric arc furnace smelting into an LF refining furnace, adding stainless steel waste into the LF refining furnace for refining, adding alloy fine-tuning components, controlling the molten steel component at the refining end point, performing whole-process protective casting on the molten steel after refining, obtaining a continuous casting billet, performing rolling, tempering and cooling treatment on the continuous casting billet after heat supplement, and obtaining the ultrahigh-strength weather-resistant steel bar.The ultrahigh-strength weather-resistant steel bar has a finished product tensile strength Rm of greater than or equal to 1000 Mpa, a yield strength Rel of greater than or equal to 800 Mpa, and a breaking elongation A of greater than or equal to 10%.

The application discloses a preparation method of a CoCrNi medium-entropy alloy material for additive manufacturing, and the CrCoNi medium-entropy alloy and the preparation method thereof comprise the following steps: a. adding 0%-1wt% of rare earth CeO2 into the CrCoNi medium-entropy alloy, and mixing powder according to ingredient design; b. inputting a workpiece scanning path file into a computer, and printing a single-variable medium-entropy alloy ingot at a set step scanning speed (600-900mm / s). The application optimizes the compactness of the CoCrNi medium-entropy alloy and reduces defects by adjusting process parameters of additive manufacturing, so that an additive manufacturing workpiece with high strength, good fracture toughness and good strength-plasticity matching is obtained. Compared with the prior art, the application optimizes the compactness of the CoCrNi medium-entropy alloy and reduces defects by adjusting process parameters of additive manufacturing, so that an additive manufacturing workpiece with high strength, good fracture toughness and good strength-plasticity matching is obtained.

The present invention relates to an aluminum alloy disc blank for a magnetic disc, characterized by being formed of an aluminum alloy containing Mg: 3.40 to 3.90 mass%, the balance consisting of Al and unavoidable impurities, the aluminum alloy disc blank for a magnetic disc having an electrical conductivity of 36.0% IACS or more.

This invention provides a hot-rolled strip quality prediction method and system based on PINN modeling and cross-modal graph learning, belonging to the fields of industrial intelligent manufacturing and hot-rolled strip quality monitoring. The method first acquires historical production process variable data, strip quality data, and sensor monitoring data; it then constructs a temperature field model of the hot-rolled strip water-cooling process based on PINN, and uses the trained temperature field model to solve the continuous temperature field during the laminar cooling stage, extracting temperature field features; it constructs modal subgraphs for both temperature field features and sensor features, building a cross-modal full graph structure; a preliminary prediction model is built based on GNN, using the cross-modal full graph structure as the model input layer structure, and N base learners based on a residual learning strategy are introduced into the output layer. The trained preliminary prediction model and the N base learners constitute the hot-rolled strip quality prediction model. This invention achieves a deep integration of physical mechanisms and deep learning, significantly improving the accuracy and robustness of hot-rolled strip quality prediction.

The application discloses a kind of local reinforcement selected area laser melting deposition high-strength titanium alloy preparation method and system, belong to additive manufacturing technical field.The local reinforcement selected area laser melting deposition high-strength titanium alloy preparation method provided by the application, by establishing target titanium alloy structure three-dimensional model and carrying out finite element limit load simulation analysis, stress distribution and potential dangerous area are identified;Based on the analysis result, the performance requirement is divided, the material enhanced local area is determined, and the laser scanning path and powder feeder movement trajectory are planned;Path file is imported into composite equipment to set process parameters;Titanium-based composite material powder is selectively laid in the enhanced area, and a locally reinforced structure is obtained by selective laser melting.The scheme realizes the spatial selective distribution of powder composition, forms a uniform distribution of high-stress areas, significantly improves the local strength and maintains the overall strength and plasticity matching, effectively solves the problem of insufficient performance matching of titanium alloy components under complex load.

This invention discloses a composite deformation heat treatment process for improving the strength and corrosion resistance of aluminum-lithium alloys, belonging to the field of aluminum-lithium alloy preparation technology. The composite deformation heat treatment process for improving the strength and corrosion resistance of aluminum-lithium alloys of this invention includes the following steps: (1) performing solution treatment, water quenching, and natural aging treatment on the aluminum-lithium alloy in sequence; (2) performing pre-deformation treatment on the aluminum-lithium alloy treated in step (1); (3) performing non-isothermal aging treatment on the aluminum-lithium alloy treated in step (3); wherein, the pre-deformation amount of the pre-deformation treatment is 4~10%; the non-isothermal aging treatment is to first raise the temperature from 40℃ to 140~200℃ and then lower the temperature to 100~160℃; the aluminum-lithium alloy treated by the composite deformation heat treatment process of this invention has both good mechanical properties and corrosion resistance.

This invention discloses an Al-Mn-Fe-Si alloy with both high strength and toughness and good workability, as well as its preparation method. This invention adds Er and Zr elements, utilizing their synergistic effect to induce the formation of fine and dispersed Al3(Zr,Er) phases within the alloy. These phases act as heterogeneous nucleation sites, refining the grain size and inhibiting recrystallization during subsequent processing. Furthermore, Er elements suppress Zr segregation, preventing coarsening of the precipitated phases. The synergistic effect of these two elements enhances the alloy's yield strength. By simultaneously controlling the content and ratio of impurity elements Fe and Si in addition to Er and Zr, the formation of spherical or blocky semi-coherent α-Al(Fe,Mn)Si phases is promoted, improving precipitation strengthening. The prepared alloy balances high strength and toughness with good workability, effectively addressing the current shortcomings in strength and plasticity of 3-series aluminum alloys.

This invention relates to an aluminum alloy material with heterogeneous inner and outer layers and its preparation method. The designed aluminum alloy exhibits a wide-ranging grain size distribution, with submicron equiaxed crystals on the surface and micron-sized deformed internal structures. The preparation method is as follows: First, the workpiece undergoes high-frequency pulsed nanosecond laser remelting. Utilizing the extremely short duration and high instantaneous energy of the high-frequency pulsed nanosecond laser, submicron equiaxed crystals with a size of 350–550 nm are formed on the material surface. Then, the laser-melted workpiece undergoes heat treatment to reduce residual internal stress caused by recrystallization. Finally, the heat-treated workpiece undergoes low-temperature rolling deformation treatment, resulting in a banded structure within the material, constructing an aluminum alloy material with a surface of 350–550 nm submicron equiaxed crystals encapsulating an internal banded structure. While ensuring good plasticity, this invention significantly improves the yield strength of the material, solving the technical problem of balancing yield strength and plasticity in aluminum alloy materials.

This invention discloses a casting process for high-strength ductile iron, relating to the technical field of cast iron materials and casting processes. The process includes the following steps: S1, preparing a sand mold, and sequentially forming a sulfur-blocking layer, a diffusion-regulating layer, and a slow-release post-inoculation layer on the surface of the mold cavity to obtain a mold with a gradient reaction coating; S2, melting the base iron, and subjecting the base iron to spheroidization treatment and a primary inoculation treatment to obtain spheroidized iron to be poured; S3, pouring the spheroidized iron to be poured into the mold with the gradient reaction coating, allowing the slow-release post-inoculation layer to contact the spheroidized iron to be poured and release interfacial inoculation active particles; the surface coating of the mold is designed as a gradient structure of a sulfur-blocking layer, a diffusion-regulating layer, and a slow-release post-inoculation layer, so that sulfur blocking, diffusion blocking, and interfacial post-inoculation are spatially partitioned and temporally coordinated, avoiding premature reaction and inoculation failure caused by simple mixing of sulfur-blocking powder and inoculator.

The application discloses a high-modulus magnesium-based composite material and a preparation method and application thereof, and belongs to the technical field of magnesium alloy materials. The preparation raw material of the magnesium-based composite material comprises micron Ti particles coated with nano Al and magnesium-aluminum-zinc alloy powder; the mass of the micron Ti particles and the nano Al powder is 10wt%-15wt% and 5wt%-9wt% of the mass of the magnesium-aluminum-zinc alloy powder respectively; the magnesium-aluminum-zinc alloy powder contains 1wt%-9wt% of Al and 0.5wt%-1.5wt% of Zn, and the balance is Mg; the magnesium-aluminum-zinc alloy powder forms a matrix of the magnesium-based composite material; the nano Al powder and the Mg in the matrix form an Al2O3 composite MgO nano layer with a semi-coherent orientation relationship at the interface; and the Al element is segregated at the grain boundary of the matrix. The magnesium-based composite material has excellent strength, plasticity and elastic modulus, and can meet the requirements of 3C electronic product structural parts.

The invention discloses a high-strength and high-wear-resistance cast aluminum alloy material and a preparation method thereof, and belongs to the technical field of motors for new energy automobiles. The cast aluminum alloy material is prepared from the following components in parts by weight: 0.2 to 0.5 weight percent of Si, 0.7 to 1.0 weight percent of Cu, 0.2 to 0.5 weight percent of IIA group elements and the balance of Al and inevitable impurities. The cast aluminum alloy material can reduce the alloy cracking tendency in the casting process, so that the yield strength and the tensile strength of a cast aluminum rotor made of the alloy material are improved, the cast aluminum rotor can stably run when running at the high rotating speed of 23000 rpm or above, and the running safety of the cast aluminum rotor is improved.

The invention discloses a strengthening method of Nb-stabilized austenitic stainless steel. The method comprises the following steps that S1, the Nb-stabilized austenitic stainless steel is subjected to ultrahigh-temperature decomposition treatment, and primary coarse MC carbide in the material is completely redissolved; s2, cold rolling treatment is carried out, and dislocation plugging is introduced into the material; s3, recrystallization solution treatment is carried out, static recrystallization of the material is induced through deformation energy stored by dislocation plugging, and coarsened grains in the material are refined again and recovered to an equiaxed fine grain structure; and S4, synergistic precipitation aging treatment is conducted, the recrystallized intracrystalline substructure is evolved to form high-density faults, meanwhile, directional non-uniform nucleation occurs on supersaturated solute atoms on the fault plane, and synergistic formation and precipitation of the faults and nanoscale secondary MC carbides are achieved. Compared with the prior art, the contradiction between dissolving the primary phase and maintaining the fine grain structure is solved, and the material strength and thermal stability are remarkably improved on the premise that the plasticity of the material is not sacrificed.

The application discloses a kind of photovoltaic welding band and preparation method thereof, belong to photovoltaic material technical field.The method includes: in-situ chemical reduction preparation silver coating five silver nanometer reinforcing agent, silver nanoparticle uniform load forms core-shell structure;Ultrasonic-assisted smelting Sn-Bi-Ag-Cu quaternary solder master alloy;Copper band microetching forms Ra0.35-0.55 μm porous structure;Silane bridging hot-dip plating, control solder layer thickness 18-22 μm, staged cooling.Compared with prior art, the welding band tensile strength of the application is improved, the solder joint shear force is improved, the wet heat aging retention rate is in high position, the interface hole rate is reduced, the reliability and welding performance are significantly improved, and is suitable for high-efficiency photovoltaic module.

This invention discloses a heat treatment method for improving the yield strength ratio of steel used in continuous extrusion dies. Specifically, the steel is subjected to the following sequential heat treatments: high-temperature normalizing, low-temperature normalizing, spheroidizing annealing, high-temperature quenching, high-temperature tempering, and low-temperature tempering. The high-temperature normalizing temperature is 1070℃~1100℃; the low-temperature normalizing temperature is 710℃~730℃; the spheroidizing annealing temperature is 840℃~870℃; the high-temperature quenching temperature is 1070℃~1100℃; the high-temperature tempering temperature is 620℃~640℃; and the low-temperature tempering temperature is 530℃~550℃. The yield strength ratio of the die steel after heat treatment using this method is ≥0.91, and the hardness is 48~52 HRC.

The application provides an acid core wire and a preparation method and application thereof, and particularly relates to the technical field of welding materials. The core wire comprises a steel belt sheath and a core filled in the steel belt sheath. The core comprises the following components in percentage of mass: 35-50% of rutile, 2.5-5% of zircon sand, 2.5-5% of potassium feldspar, 1.5-3% of potassium fluozirconate, 1.5-3% of quartz, 15-20% of metallic manganese, 3-5% of ferrosilicon, 15-20% of nickel powder, 1-2% of cobalt powder, 1-2% of molybdenum powder, 1-2% of aluminum-zirconium alloy, 1.5-3.5% of magnesium powder, 1-2% of perovskite, and the rest is atomized iron powder. The acid core wire has good welding process, good arc stability, less spatter, good appearance of weld formation, good deslagging property, high deposition rate and deposition rate, and the weld has the characteristics of high strength, high low-temperature impact toughness and corrosion resistance, and can meet the use requirement of high-strength Q690 rack steel.

According to the present disclosure, a steel frame for a photovoltaic module is formed by bending a single alloy-plated steel sheet, and the steel frame for the photovoltaic module includes a frame member having an insertion portion into which a photovoltaic panel is inserted and a cavity portion formed with a closed cross section. The alloy-plated steel sheet includes a Mg-Al-Zn-based plating layer on a surface of a steel sheet having a yield strength of 280 MPa to 350 MPa.

The invention discloses an endogenous titanium carbide reinforced ultrahigh-strength aluminum alloy and a green laser directional energy deposition method thereof, and relates to the technical field of aluminum alloy preparation, and the preparation method comprises the following steps: preparing an aluminum-titanium-carbon nanotube system compact; the aluminum-titanium-carbon nano tube system pressed blank is immersed into an aluminum alloy melt, titanium carbide pre-dispersion is carried out based on an in-situ reaction in the melt, and an endogenous titanium carbide reinforced aluminum alloy cast ingot is obtained; annealing and drawing the endogenous titanium carbide reinforced aluminum alloy cast ingot to obtain an endogenous titanium carbide reinforced aluminum alloy wire; the internally-coated titanium carbide aluminum alloy powder is prepared from the endogenous titanium carbide reinforced aluminum alloy wire, and the titanium carbide reinforced aluminum alloy is obtained through green laser directional energy deposition. The method is reasonable in technological process, has the advantages of being low in cost and short in period, and provides an innovative path for preparation of the high-performance additive manufacturing aluminum alloy.

This invention relates to the field of hot extrusion manufacturing technology, specifically to a high-strength weldable 6xxx series aluminum alloy profile, its manufacturing method, and its application. The aluminum alloy profile is composed of the following weight percentages: Si: 0.80%~1.2%, Fe≤0.20%, Cu: 0.40%~0.80%, Mn: 0.30%~0.70%, Mg: 0.70%~1.1%, Cr≤0.25%, Zn≤0.10%, Ti≤0.10%, Zr: 0.05%-0.20%, Pb<0.01%, with the balance being Al and unavoidable impurities. The profile meets the following performance requirements: tensile properties, R... m ≥420MPa, R p0.2 ≥330MPa, A 50mm ≥8.0%; Fatigue performance: at r=0.1, N=1×10 7 Under the same conditions, the fatigue strength σ of the smooth sample is ≥145MPa, realizing the lightweight manufacturing of high-speed trains.

According to the high-strength and high-plasticity FeNiAl eutectic high-entropy alloy and the preparation method thereof, through the collaborative design of B microalloying, homogenization, cross cold rolling deformation and medium-temperature heat treatment optimization, a fine and uniform eutectic lamellar structure and a high-density dislocation structure are formed in a plate, the brittleness brought by an as-cast coarse structure is effectively relieved, and the high-strength and high-plasticity FeNiAl eutectic high-entropy alloy is obtained. The tensile strength and the yield strength are remarkably improved, meanwhile, high ductility and fracture resistance are kept, and the performance anisotropy caused by the rolled texture is further weakened. The technological process is simple, parameters are easy to control, and the method is suitable for industrial amplification application and is suitable for high-temperature structural parts, molds, impact load components and other scenes with high requirements for comprehensive mechanical properties of materials.

The invention belongs to the technical field of high-entropy alloys, and particularly relates to a high-toughness CoCrNiAl series eutectic high-entropy alloy additive manufacturing method. Aiming at the condition that traditional additive manufacturing metal materials are insufficient in strength and toughness, the invention provides the principle that in-situ refining of an additive manufacturing structure is realized through a fine and uniform B2 phase capable of being sheared by utilizing the characteristic of rapid solidification of additive manufacturing, so that the strength and toughness are comprehensively improved. Based on the principle, the general formula of the eutectic high-entropy alloy is CoaCrbNicAld, a is larger than or equal to 29 and smaller than or equal to 35, b is larger than or equal to 18 and smaller than or equal to 23, c is larger than or equal to 27 and smaller than or equal to 35, d is larger than or equal to 13 and smaller than or equal to 19, and a + b + c + d = 100. The eutectic high-entropy alloy prepared through the laser powder bed melting technology achieves high strength, high ductility and high fracture toughness under the condition that subsequent heat treatment is not needed. The design principle of the invention can also be popularized to other eutectic high-entropy alloy systems.

The utility model provides a novel tandem type water-cooled resonant capacitor, comprising capacitor cores and copper electrodes, the upper and lower end faces of the capacitor cores are respectively welded with one copper electrode, the whole capacitor cores are cylindrical, the number of the capacitor cores is two, and the capacitor cores comprise a first copper foil, a second copper foil, a polypropylene optical film and a metallized polypropylene film. The first copper foil and the second copper foil are used as extraction electrodes, the metallized layer of the metallized polypropylene film is used as an intermediate electrode, the two layers of electrodes are separated by the metallized film, a polypropylene medium is arranged in a gap between the first copper foil and the second copper foil, and the capacitor core is formed by winding the copper foil, the polypropylene optical film and the metallized polypropylene film around the hard core rod. Spraying metal layers at two ends, welding the core and the copper electrodes together by using low-temperature soldering tin, and encapsulating a sealing material around the core; the copper electrode is provided with six water through holes, and the six holes are communicated through a connecting pipe to conduct internal water circulation. The power output and reliability of the capacitor are greatly improved, and the service life of the capacitor is greatly prolonged.

This invention discloses a high-strength, high-ductility, low-density steel and its preparation method. The composition is: C: 0.85–1.15%, Mn: 9.5–12%, Al: 8.5–11.5%, Ni: 2.5–3.5%, Cr: 2–3%, V: 0.3–0.5%, S≤0.005%, P≤0.008%, iron, and unavoidable impurities. The preparation method includes smelting, casting, forging, hot rolling, cold rolling, and recrystallization annealing processes. Through a high-C, medium-Mn, and high-Al synergistic design, Cr suppresses grain boundary carbide segregation, Ni promotes the formation of the B2 ordered phase, and V microalloying promotes the precipitation of the VC precipitate, forming a multi-scale layered structure composed of banded δ-ferrite, equiaxed (Fe,Ni)Al-type B2 phase, austenite, and nano-VC precipitates. The recrystallization annealing process achieves multi-scale layered structure control and synergistic strengthening of equiaxed (Fe,Ni)Al-type B2 phase and VC nanoprecipitates through rapid heating-short holding-rapid cooling. This invention breaks through the bottleneck of balancing strength, plasticity, and density in low-density steel, providing a high-performance material solution for automotive lightweighting.