134results about How to "High elongation" patented technology

The invention discloses an electric arc additive thin-wall component strengthening and toughening method based on laser shock peening. The method comprises the following steps that a thin-wall test piece is prepared; planning an unstrengthened area and a plurality of laser shock strengthening sub-areas on the surface of the test piece; selecting a laser shock peening sub-region, selecting laser shock peening parameters for laser shock peening, and adjusting the laser shock peening parameters until the total thickness of the pore-free layer and the hardened layer meeting the target requirement is obtained, so as to obtain optimized laser shock peening parameters; and selecting a plurality of laser shock peening sub-regions, performing peening by adopting optimized laser shock peening, selecting annealing parameters for annealing treatment, and repeating the annealing parameter adjustment operation until the total thickness of the pore-free layer and the hardened layer meeting the target requirement is obtained, so as to obtain optimized annealing parameters. According to the method, the pore-free layer and the hardened layer with reasonable thicknesses are generated on the surface of the additive aluminum alloy thin-wall part, the near-surface layer strength of the thin-wall part is improved, and the strength and plasticity of the arc additive aluminum alloy thin-wall part are improved at the same time.

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.

This invention belongs to the field of casting cutting technology, and mainly relates to a cutting method for preventing cracking of nickel-based superalloy castings. It changes the cutting process and process control parameters in existing technologies, providing a complete and effective cutting method. It strictly controls the parameter values ​​of key nodes in each cutting step, avoiding the casting from passing through the brittle phase precipitation temperature range, improving the casting's plasticity and toughness, reducing stress, and preventing crack formation. The casting undergoes annealing after molding to eliminate casting stress, providing a better cutting condition for subsequent riser cutting. The cutting method provided by this application effectively prevents casting cracking during cutting, making casting manufacturing quality controllable and reducing rework costs. After annealing, the elongation is significantly increased by about 500%, and the plasticity is significantly improved, effectively reducing the risk of cracking.

The invention relates to a multi-stage hot rolling process of a Cu-Zn-Ni alloy double solid wrench for an acetylene environment, and relates to the technical field of copper alloy manufacturing, a Cu-Zn-Ni alloy is cast into a blank, then the casting blank is subjected to multi-stage hot rolling to manufacture the double solid wrench, the multi-stage hot rolling is divided into rough rolling, intermediate rolling and finish rolling, the rolling temperature of rough rolling is 920-940 DEG C, the single-pass reduction is 15-20%, the deformation is 30-40%, and the rolling temperature is 920-940 DEG C; the rolling temperature is not less than 850 DEG C; the initial rolling temperature of the intermediate rolling is 920-940 DEG C, the deformation is 10-15%, and the final rolling temperature is 780-820 DEG C; the rolling temperature of the finish rolling is greater than or equal to 880 DEG C, and the deformation is less than or equal to 10%. The Cu-Zn-Ni alloy double solid wrench prepared by the production method disclosed by the invention meets the working requirements in an acetylene environment.

The application discloses a heat treatment method of a titanium alloy material for an aviation aircraft, and comprises the following steps: S1, heating forging; S2, die forging; and S3, double annealing heat treatment. The heat treatment method optimizes and adjusts the heat treatment process in the preparation process of the TC21 titanium alloy, mainly optimizes and adjusts the cooling mode, the holding time and other parameters of the double annealing, so that the cooling speed is adjusted, the secondary lamellar or spherical alpha phase is obtained in the first annealing, the acicular alpha phase is obtained in the second annealing, the strength of the titanium alloy is improved through the content of the alpha phase, and the prepared TC21 titanium alloy meets the high performance requirements of strength greater than or equal to 1200 MPa, yield greater than or equal to 1100 MPa and A greater than or equal to 8.

This invention discloses a method for preparing high-elongation bars for cold forging, belonging to the field of aluminum alloy preparation technology. Through optimization of composition and process, the prepared bars possess high purity, uniform and fine equiaxed grain structure, and excellent plasticity, with significantly improved elongation. This meets the stringent requirements of cold forging for high material plasticity, resulting in a bright, crack-free surface and uniform grains after cold forging, overcoming problems such as oxide scale, coarse grains, and poor dimensional accuracy caused by hot forging. Furthermore, the introduction of modified talc and sodium nitrate as refining agents further promotes uniform microstructure, achieving high elongation and excellent cold forging performance.

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.

This invention relates to the field of metal material processing technology. It discloses a synergistic composite forming process for metal wire electroforming and drawing, comprising the following steps: first, surface cleaning and activation treatment of the base metal wire to remove oxide layers, oil stains, and impurities; then, feeding the pretreated wire into an electroforming device to deposit a metal plating layer, obtaining an initial electroformed composite wire; subsequently, direct online radial high-pressure drawing to achieve a dense bond between the electroformed layer and the base metal; followed by annealing of the composite wire; repeating the electroforming, drawing, and annealing steps at least once to complete multiple synergistic cycles; finally, testing the dimensional accuracy, mechanical properties, and interlayer bonding force of the composite wire, and cutting it into finished products after passing the tests. This invention employs an online tandem synergistic process of electroforming and drawing, avoiding plating oxidation and interface contamination. Radial high-pressure drawing can compact the plating layer, eliminate porosity, and improve bonding density.

This invention discloses a hot-rolled steel sheet for vacuum train tubes that exhibits excellent yield strength, weldability, low-temperature toughness of the welded portion, vibration damping ratio, and is free from hot cracking. The hot-rolled steel sheet according to this invention is characterized in that its alloy composition, by weight percent, comprises: C: less than 0.06% (more than 0%), Si: 0.5-1.5%, Mn: 1.2-2.2%, Cu: 0.5-1.5%, Ni: more than 0.25%, Ti+Nb+V: less than 0.02% (inclusive of 0%), the balance being Fe and unavoidable impurities.

This invention provides a high-strength, high-toughness, and high-thermal-stability nanoparticle-reinforced AZ91 magnesium alloy and its preparation method. The preparation method includes the following steps: mixing niobium-titanium-aluminum alloy powder, BN powder, and C powder, then sealing the mixture in an aluminum tube to obtain an aluminum-powder composite tube blank containing powder particles; then subjecting the composite tube blank to cold drawing and alternating heat treatment, melting, mixing with molten pure aluminum, and twin-roll casting to obtain an intermediate alloy wire containing nano-ceramic particles; mixing the preheated intermediate alloy wire with molten magnesium alloy, followed by mechanical stirring, ultrasonic dispersion, refining and degassing, and cleaning. A high-strength, high-toughness, and high-thermal-stability nanoparticle-reinforced AZ91 magnesium alloy is obtained by slag removal, casting, homogenization treatment, air cooling, extrusion molding, and annealing. The magnesium alloy has a room temperature yield strength of 178.7-290.2 MPa, a tensile strength of 238.9-389.1 MPa, and a fracture strain of 12.4-14.6%. After serving at 150-180℃ for 30-100 hours, the yield strength is 120.3-151.8 MPa, the tensile strength is 158.1-203.6 MPa, and the fracture strain is 38.7-61.9%.

The invention discloses a method for improving the structure and performance of a 6063 aluminum alloy formed through selective laser melting, and belongs to the technical field of selective laser melting. Titanium powder and zirconium hydride in a certain proportion are selected as doping agents, the doping agents are evenly mixed with 6063 aluminum alloy powder through a ball milling method, and then drying and dehumidification are conducted; and the mixed alloy powder is put into selected-area laser melting equipment, manufacturing is carried out on the surface of a base material under inert gas protection, and the 6063 aluminum alloy is obtained after laser, scanning, powder laying and deposition. According to the method, the microstructure and the mechanical property of the selective laser melting forming 6063 aluminum alloy are obviously improved, so that the selective laser melting forming 6063 aluminum alloy meets the industrial performance requirement of SLM, and good market competitiveness is achieved.

The application provides a 3D printing method for preparing a low-cost TA15 part based on a bimodal particle size distribution near-spherical powder and a high-performance low-cost TA15 part. The 3D printing method uses a bimodal particle size distribution near-spherical TA15 alloy powder with good uniformity as a raw material, improves the near-spherical powder bed density through bimodal grading of coarse powder and fine powder, and then prepares a low-cost high-performance TA15 part through an optimized selective laser melting (SLM) process parameter window suitable for bimodal distribution powder, thereby providing a more cost-effective preparation method for TA15 titanium alloy parts in aerospace.

This invention belongs to the field of grape cultivation technology, specifically relating to a fruit enlargement agent for Daqing grapes, its preparation method, and its application. The fruit enlargement agent for Daqing grapes is prepared from an aqueous solution of gibberellin, thiabendazole, and brassinolide. Specifically, the concentration of gibberellin in the fruit enlargement agent is 20 mg / L~25 mg / L, the concentration of thiabendazole is 1.0 mg / L~1.25 mg / L, and the concentration of brassinolide is 0.025 μg / L~0.050 μg / L. The fruit enlargement agent of this invention, combined with fruit thinning treatment, can increase the weight of a single Daqing grape berry by at least 20% while retaining the soluble solids content of the grape.

The invention discloses an aluminum beryllium enhanced high-conductivity heat-resistant aluminum alloy material and a preparation method thereof, and belongs to the technical field of metallurgical wire rod processing. The aluminum beryllium enhanced high-conductivity heat-resistant aluminum alloy material is prepared from the following components in percentage by weight: 0.12 to 0.16 percent of Si, 0.15 to 0.35 percent of Fe, 0.005 to 0.10 percent of Cu, 0.35 to 0.85 percent of Zr, 0.2 to 0.45 percent of Y, 0.15 to 0.35 percent of Er, 0.005 to 0.03 percent of B, 0.001 to 0.02 percent of Ti, 0.03 to 0.05 percent of Be, less than or equal to 0.5 percent of other impurities and the balance of Al. According to the aluminum alloy single wire, the specific raw material composition is adopted, namely, multiple elements such as Zr, Y, Er and Be are compositely added, and the proportion of the elements is strictly controlled, so that the prepared aluminum alloy single wire achieves synergistic improvement of high strength, high conductivity and excellent heat resistance.

The middle pier structure comprises middle pier gate grooves, the middle pier gate grooves are formed in the two sides of a middle pier, and gates are located between the middle pier gate grooves and side piers; the middle pier gate groove comprises a supporting assembly and a connecting assembly. One side of the connecting assembly is connected with the supporting assembly, the other side of the connecting assembly is connected with the middle pier, and the connecting assembly is located between the supporting assembly and the middle pier. Wherein the connecting assembly is fixedly connected with the supporting assembly; or the connecting assembly is detachably connected with the supporting assembly. According to the middle pier structure, through fixed connection or detachable connection of the connecting assembly and the supporting assembly, when the gate groove needs to be maintained or parts need to be replaced, dismounting and mounting can be conveniently conducted, 100% dismounting can be achieved after the gate groove is scrapped, waste is reduced, the concept of sustainable development is met, operation is convenient, and materials and cost are saved.

The utility model relates to a bulk material sample forming combined die, and belongs to the technical field of quality inspection in the metallurgical industry. Comprising a cylindrical female die with a hollow inner cavity, a pressing head is inserted into the inner cavity of the female die from the inlet end of the female die, and the outlet end of the female die is detachably connected with a die cushion; chamfered edges are respectively arranged at two ends of the inner wall of the female die; after pressing is completed, the die cushion is replaced with a demolding device, the demolding device is of a cylindrical structure with a hollow inner cavity, and after replacement, the demolding device is communicated with the inner cavity of the female die; the die cushion comprises a base and a protruding part which are connected with each other, and the protruding part is inserted into an inner cavity of the female die. The pressure head comprises a chassis and a cylinder which are connected with each other; the cylinder is inserted into the inner cavity of the female die; lubricating layers are arranged on the inner wall of the female die, the outer wall of the protruding part and the outer wall of the cylinder. According to the utility model, the bulk material is pressed into a large sample block by utilizing the plasticity, high elongation rate and percentage reduction of area of the bulk material, so that a sample preparation component sample can be conveniently drilled, and specific component analysis can be carried out.

The application discloses a high-density additive manufacturing blank and a density improvement method thereof, and relates to the technical field of additive manufacturing, which comprises the following steps: accurately positioning the spatial position of a through-hole on the surface of the blank by using nondestructive testing technology such as industrial CT, then adopting the same additive manufacturing material to perform vacuum repair welding and plugging, constructing a densification pretreatment layer, and finally performing hot isostatic pressing treatment to realize the complete closure of all types of pores (including through-holes and closed pores) in the blank. The application greatly improves the final density of the additive manufacturing blank by using the above method, and a high-performance dense component is obtained.

This invention relates to a photocurable polymer composition for 3D printers, comprising a UV-curable polyurethane oligomer, a photoinitiator, a silane coupling agent, oligomers, and a stabilizer. According to the aforementioned photocurable polymer composition for 3D printers, 3D printed outputs with excellent physical properties such as thermal properties, strength, elastic modulus, and elongation can be manufactured, and 3D printed outputs that can restore their original shape even if deformed through use.

This invention discloses a laser-shock-assisted creep aging forming method for thin-walled components with complex curvature. The method includes: simulating and obtaining difficult-to-form regions; performing laser shock on the difficult-to-form regions of a large-size aluminum alloy thin-walled component sheet; wrapping and fixing a breathable felt around the impacted component; placing the component in a sealed space formed between a vacuum bag and the mold surface; evacuating the sealed space; and then sending the mold into an autoclave for creep aging. After completion, the component springs back, yielding the target surface. This method uses a laser to impact localized areas of a large-size aluminum alloy thin-walled component, introducing dislocations while achieving pre-forming. This provides a good surface foundation for subsequent high-precision creep aging forming of the component, and is suitable for forming parts with complex curvature.

The present application relates to a kind of high-precision cold-rolled screw with medium carbon steel hot rolled wire rod in metallurgical technology field, preparation method and application.The present application is aimed at solving the technical problems of low first processing qualified rate of cold-rolled screw caused by poor material organization uniformity and low purity.The chemical composition of the wire rod according to the present application is as follows: C 0.52-0.58%, Si 0.15-0.35%, Mn 0.70-0.90%, Cr 0.10-0.35%, Al 0.015-0.045%, Ti≤0.0025%, [O]≤0.0015%, [N]≤0.0060% and the like, with the balance being Fe.The preparation method of the present application obtains uniform organization with cross-section hardness range ≤20HV through the combined action of narrow component design, continuous casting end electromagnetic stirring, high temperature diffusion annealing and "fast first and slow later" controlled cooling process.The present application is mainly used for manufacturing high-precision ball screw, and the finished product precision reaches more than 5 levels, with first cold-rolled forming qualified rate ≥85%.

The utility model provides a combined rubber shock absorber, which relates to the technical field of rubber shock absorbers and comprises a group of rubber shock absorber bodies, rubber seats are mounted at the top ends of the rubber shock absorber bodies, a group of first connecting grooves are formed in one side of each rubber shock absorber body, a first connecting block is mounted on one side of each rubber shock absorber body, and a second connecting groove is formed in the other side of each rubber shock absorber body. A set of second connecting blocks are installed on the sides, away from the first connecting blocks, of the rubber shock absorber bodies, a second connecting groove is formed between every two adjacent second connecting blocks, and a connecting mechanism is arranged at the attaching position of each set of rubber shock absorber bodies. According to the device, the operation steps are very simple and convenient, a worker can conveniently and rapidly combine and install a rubber shock absorber body, the combination efficiency is indirectly improved, and the practicability is greatly improved through the design.

The application belongs to the technical field of metal matrix composite material preparation, and discloses a preparation method of an intracrystalline dispersed TiC and grain boundary network AlN particle configuration reinforced aluminum matrix composite material, which comprises four steps: firstly, a core-shell powder is prepared by depositing an AlN precursor on the surface of aluminum powder; a core double-shell composite powder is obtained by modifying TiC electrostatic adsorption; a low-temperature pulse pre-pressing protective surface film is prepared; and a multi-stage pulse sintering is performed to induce local micro-melting of the matrix, and the composite material with intracrystalline dispersed TiC and grain boundary enriched AlN is obtained by relying on solid-liquid interface separation. The method forms an AlN grain boundary network and TiC intracrystalline dispersion double-mode configuration through process control, the three-dimensional quasi-continuous AlN at the grain boundary can strongly pin the grain boundary and inhibit the grain growth, and the high-temperature strength and creep resistance of the material are greatly improved, the uniformly distributed nanometer TiC in the crystal can hinder the dislocation movement by the Orowan dislocation bypass mechanism, the room temperature strength and toughness are improved, and the two kinds of strengthening mechanisms work together to meet the use needs.

The invention relates to a method for forming a SiCp / Al composite material interface by regulating and controlling LPBF based on SiCp pre-oxidation. The defects that an existing LPBF formed SiCp / Al composite material is serious in interface harmful reaction, weak in binding force and poor in material plasticity are overcome. The method comprises the following steps: pre-oxidizing SiCp; mechanically mixing the powder; and carrying out LPBF forming. According to the method, after SiCp is pre-oxidized, an MgAl2O4 transition layer is formed on the interface of SiCp and an Al matrix after LPBF forming, generation of harmful brittle phases between SiCp and the Al matrix is effectively avoided, the bonding strength of SiCp and the Al matrix is improved, the interface reaction path at the high temperature is regulated and controlled fundamentally, and LPBF forming of the high-performance SiCp / Al-based composite material is completely achieved.

The present application relates to a kind of nitrile glove and its preparation method.The nitrile glove includes outer layer and inner layer, the outer layer is prepared by first nitrile emulsion, the inner layer is prepared by second nitrile emulsion.The nitrile composition is prepared nitrile glove, and no chlorine water hardening treatment is needed to be carried out to be smooth demoulding, no chlorine residue, and the nitrile glove obtained not only maintains good tensile strength and elongation, but also pinhole rate is not promoted, meets the product requirement of qualified quality.

The application discloses a preparation method of high-strength and high-ductility titanium-based composite material with a composition gradient, and comprises the following steps: 1, material selection: selecting a plurality of Mo equivalent different beta type titanium alloy powder as a matrix material, and selecting carbon nanoparticles as a precursor material of a reinforcing body; 2, powder mixing: placing the plurality of Mo equivalent different beta type titanium alloy powder and the carbon nanoparticles in a ball mill and ball milling and uniformly mixing; 3, forming: performing plasma sintering forming on the mixed powder; 4, heat treatment: performing solid solution treatment on a titanium-based composite material blank to obtain the high-strength and high-ductility titanium-based composite material with the composition gradient. The application utilizes a powder metallurgy method to sinter the plurality of Mo equivalent different beta type titanium alloy powder and the carbon nanoparticles into a bulk alloy, so that the sintered bulk alloy has the composition gradient, and the prepared titanium-based composite material with the composition gradient has excellent mechanical properties and is a high-strength and high-elongation composite material.

This invention discloses a hot-rolled steel sheet with high elongation and a tensile strength of 800MPa, and its manufacturing method, mainly solving the technical problems of low elongation and high production cost of existing hot-rolled steel sheets with a tensile strength of 800MPa. The technical solution is a hot-rolled steel sheet with a tensile strength of 800MPa and high elongation, whose chemical composition by weight percentage is: C: 0.03%–0.06%, Si: 0.20%–0.40%, Mn: 1.00%–1.50%, P≤0.015%, S≤0.003%, Alt: 0.02%–0.05%, Nb: 0.01%–0.02%, Ti: 0.14%–0.20%, Cr: 0.10%–0.30%, N≤0.0040%, with the balance being Fe and unavoidable impurity elements; the elongation at break (A) of the 2.0–6.0 mm thick hot-rolled steel sheet is 20%–30%. It is used to manufacture structural parts for automobiles and other applications.

This invention provides a rolling process for eliminating noise during flaw detection of high-strength aluminum alloy sheets with low alloy content. The process employs a three-stage homogenization heat treatment: heating at 40℃ / h to 400-405℃ and holding for 3 hours; heating at 40℃ / h to 445-460℃ and holding for 10-24 hours; heating at 10℃ / h to 492-496℃ and holding for 8-24 hours; and then rolling at 420℃. The rolling process uses 9-15 passes, with the first three passes being rapid rolling and the last three passes using a large reduction (greater than 17% reduction per pass) for rapid rolling. The middle passes use a large reduction for rapid rolling, while the remaining passes use a small reduction for slow rolling. The final rolling temperature is not lower than 410℃. The thick plates obtained by this rolling process have a uniform microstructure along the thickness direction, small grain size, pass non-destructive testing, and possess high strength, plasticity, and fracture toughness.

The application relates to the technical field of titanium alloy deformation heat treatment and microstructure performance regulation, and discloses a multi-direction forging method with temperature and deformation amount of alpha+beta titanium alloy being cooperatively and step by step reduced, which adopts a process of step by step temperature reduction and three-direction vertical deformation matching: square blank of alpha+beta titanium alloy is prepared and surface cleaning is carried out, first, compression deformation of 40%-50% is carried out along the X direction under the condition that the temperature is 5-20 DEG C higher than the beta transformation temperature of the alloy, then, compression deformation of 30%-40% is carried out along the Y direction after the temperature is reduced to the range of 50 DEG C below the beta transformation temperature, and then, compression deformation of 20%-30% is carried out along the Z direction after the temperature is continuously reduced to the range of 100 DEG C below the beta transformation temperature, the three directions are perpendicular to each other, and air cooling is carried out to room temperature after deformation; the application solves the problems in the prior art that the alpha+beta titanium alloy forging cannot consider the deformation plasticity and microstructure refining effect, the performance promotion depends on component adjustment, the process is complex, and the effect of the synergistic promotion of strength and plasticity is poor.