19results about How to "Improve strong plasticity" patented technology

The invention relates to a high-plasticity GH4141 alloy cold-drawn bar with a uniform structure and a preparation method of the high-plasticity GH4141 alloy cold-drawn bar, belongs to the field of high-temperature alloy materials, and solves at least one of the problems that in the prior art, a GH4141 bar is poor in grain size uniformity, and a fastener is poor in performance stability, low in forming qualification rate and the like due to insufficient plasticity. The preparation method of the high-plasticity GH4141 alloy cold-drawn bar with the uniform structure comprises the steps that a hot-rolled GH4141 alloy bar blank is subjected to solution treatment, and then first-time cold drawing, first-time intermediate annealing treatment, second-time cold drawing, second-time intermediate annealing treatment, finished product cold drawing and finished product annealing treatment are sequentially carried out. According to the method, the plasticity is remarkably improved while the strength of the GH4141 alloy cold-drawn bar is guaranteed, and the upsetting qualification rate of a fastener and the product performance consistency are effectively improved.

This invention belongs to the field of aluminum alloy materials technology, and relates to a high-strength and ductile aluminum alloy and its preparation method. The alloy comprises, by mass fraction: 2-6% Mg, 0.4-0.9% Mn, 0.2-0.6% Si, 0.05-0.15% Sn, Fe≤0.15%, Ti≤0.1%, with the balance being Al. By introducing Sn, a low-melting-point MgSiSn primary phase is formed in the as-cast stage, and transforms from a continuous network to a discontinuous granular structure during homogenization heat treatment, weakening the adverse effects of brittle intermetallic compounds at grain boundaries. Simultaneously, Sn dissolved in the aluminum matrix forms a nanoscale MgSiSn precipitate during homogenization, serving as a heterogeneous nucleation core for the Mn-containing second phase, lowering its nucleation energy barrier, and promoting high-density, fine, and uniform precipitation, thereby achieving a synergistic improvement in the alloy's strength and ductility.

This invention discloses an ultra-high strength and plasticity three-dimensional multi-level hybrid heterogeneous titanium-based composite material and its preparation method. The method includes: 1. performing a flow friction coating treatment on titanium alloy powder and modified amorphous cracked carbon with high active sites; 2. performing a flow friction coating treatment on modified high active and highly dispersed boron source; 3. low-temperature short-time high-pulse current-assisted vacuum hot pressing sintering; 4. multiple non-constant rate hot deformation treatments. This invention uses modified amorphous cracked carbon with high active sites and modified high active and highly dispersed boron source as reinforcing phase precursors to sequentially coat a titanium alloy powder matrix. Combined with sintering and hot deformation treatments, a multi-level, multi-scale, and multi-heterogeneous phase structure is constructed in four dimensions to obtain a three-dimensional multi-level hybrid heterogeneous titanium-based composite material, which exhibits ultra-high strength and plasticity, with a tensile strength of 1430 MPa to 1605 MPa and an elongation of 7.5% to 9%.

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 novel ultra-thin strip of 301 stainless steel and its preparation method, belonging to the field of advanced high-strength steel technology. The strip composition by mass percentage is: 0.1–0.2% C, 0.4–0.5% Si, 1–2% Mn, 1–1.5% Al, 15–18% Cr, 8.0–9.0% Ni, 0.1–0.2% Mo, with the balance being Fe and impurities. The preparation method involves: forging the steel ingot at 1100℃–1200℃, followed by low-temperature hot rolling at 600℃–800℃, pickling, and then cold rolling at 150℃–200℃ with a pulsed current, resulting in a reduction of 90%–95%. This invention improves stacking fault energy through compositional regulation, inhibits martensitic phase transformation, and induces twinning deformation; the pulsed current promotes regular dislocation movement; and the Al element grain boundary segregation forms a micro / nano layered structure, achieving a synergistic effect of twin refinement and layered toughening. The resulting ultra-thin strip has a tensile strength of 1100MPa to 1200MPa and an elongation of 40% to 50%, overcoming the contradiction between strength and plasticity, and is suitable for high-performance elastic components in the fields of electronics and aerospace.

This invention provides an ultra-high strength, low density Al-Mg-Zn-Sc-Zr-based alloy and its preparation method, belonging to the field of aluminum alloy material technology. The ultra-high strength, low density Al-Mg-Zn-Sc-Zr-based alloy provided by this invention, by mass fraction, has the following chemical composition: Mg 3.0~8.0%, Zn 1.0~5.0%, Cu 0.4~1.0%, Mn 0.1~0.8%, Ag 0.05~0.3%, Sc 0.01%~0.3%, Zr 0.05~0.3%, with the balance being Al. This invention achieves this by precisely controlling the elemental ratios of Mg, Zn, Cu, and Ag, resulting in an alloy that maintains its low density while exhibiting a strong age-hardening effect. Simultaneously, the reasonable addition of trace elements such as Mn, Sc, and Zr enables the alloy to possess a dispersion strengthening effect. Combined with heat treatment and hot deformation processes, this further improves the strength and ductility of the aluminum alloy.

The invention discloses a preparation method for constructing a multistage micro-nano heterostructure based on combination of a laser melting deposition process and a laser shock peening means, which comprises the following steps of: printing by using dry TC4 alloy powder, accumulating a printed TC4 metal printing layer to form a TC4 metal micron layer, performing low-power laser shock peening on part of the TC4 metal micron layer to form a TC4 metal submicron layer, and forming the multistage micro-nano heterostructure. A TC4 metal printing layer is printed on the submicron layer and subjected to high-power laser shock peening to form a TC4 metal nano layer, a TC4 metal printing layer is printed on the nano layer and subjected to low-power laser shock peening to form a TC4 metal submicron layer, printing and cyclic operation are continued on the submicron layer to form a sample, and the sample is obtained through annealing treatment. According to the preparation method disclosed by the invention, a micron layer-nano sandwich composite layer-micron layer multi-stage micro-nano heterostructure is formed, crack propagation is effectively hindered, and the elongation of the material is improved, so that alloy strength and plasticity synergistic strengthening is realized.

This application belongs to the field of metal composite plate preparation, specifically relating to a 304 stainless steel-high manganese steel composite plate and its preparation method. The preparation method includes the following steps: S1, obtaining 304 stainless steel slabs and high manganese steel slabs, stacking and welding the 304 stainless steel slabs and high manganese steel slabs to obtain a first composite slab; S2, heating the first composite slab to obtain a second composite slab; S3, rolling the second composite slab to obtain the 304 stainless steel-high manganese steel composite plate. This application solves the problem of "excessive thinning of the soft phase" caused by the hardness difference in "soft / hard" composite plates during rolling by introducing a thickness ratio compensation formula in the billet assembly stage. This significantly improves the thickness ratio accuracy of the final product. By dynamically adjusting the speed ratio, the rolling effect generated by "variable speed rolling" effectively offsets the internal bending moment caused by uncoordinated deformation, significantly reducing the warping and buckling phenomenon of the composite plate.

The invention discloses a method for preparing a Ti-V-O titanium alloy part through a selective laser melting forming technology, and relates to the technical field of metal material preparation. The method aims at solving the problem that in the existing selective laser melting titanium alloy preparation process, the elongation is sensitive to oxygen elements. According to the method, micron TiO2 powder and spherical V powder are used and coated through a low-energy ball milling method, and then the coated powder is uniformly mixed with CP-Ti titanium alloy powder prepared through an argon atomization method to serve as a raw material for selective laser melting forming, so that the distribution uniformity of all elements in the powder is ensured. And melting and accumulating the powder layer by layer by virtue of selective laser melting equipment to finally obtain the selective laser melting titanium alloy block with excellent mechanical properties. The prepared selective laser melting titanium alloy does not need subsequent heat treatment, the elongation in the room-temperature mechanical property of the titanium alloy is improved along with the increase of the V content, and the common oxygen embrittlement problem of the titanium alloy is avoided. The method is used for preparing the titanium alloy.

This invention discloses a method for preparing high thermal conductivity magnesium alloy sheet, comprising: 1. preparing magnesium alloy raw materials and performing alloy melting, and casting to obtain a magnesium alloy billet; 2. homogenizing the magnesium alloy billet; 3. low-temperature extrusion of the homogenized magnesium alloy billet to obtain an extruded magnesium alloy slab; 4. high-temperature short-time heat treatment of the extruded magnesium alloy slab to obtain a heat-treated magnesium alloy sheet; 5. single-pass large-reduction rolling deformation of the heat-treated magnesium alloy sheet to obtain a rolled magnesium alloy sheet; 6. low-temperature short-time annealing of the rolled magnesium alloy sheet to obtain a high-strength, high-ductility, and high-thermal-conductivity magnesium alloy sheet. This invention employs a melting-extrusion-rolling-annealing process, effectively refining grains and improving the uniformity and density of the microstructure, enhancing forming quality, and obtaining a high thermal conductivity magnesium alloy sheet with good strength and ductility matching. Furthermore, the process is short and low-cost, making it suitable for 3C electronics, aerospace, and military applications.

This invention relates to the field of magnesium alloy preparation technology, specifically to a high-strength, high-ductility, multi-scale hierarchical heterostructure magnesium alloy and its preparation method. The magnesium alloy, by weight percentage (100%), comprises the following components: Mg: 65-70%, Sc: 20-33%, with the balance being Gd. The preparation method includes: S1, weighing Mg, Sc, and Gd metals, and vacuum melting to obtain a magnesium alloy ingot; S2, solution treatment and aging to precipitate needle-like secondary α phase within the β phase; S3, high-temperature hot rolling to promote dynamic recrystallization; S4, heat treatment to adjust the biphase structure ratio of the magnesium alloy, promoting the precipitation of nano-B2-rich Sc particles and L12-rich Gd nano-precipitates, followed by cold quenching to room temperature to obtain a hierarchical heterostructure magnesium alloy. The hierarchical heterostructure prepared by this invention has a maximum tensile strength of 493 MPa, a maximum yield strength of 439 MPa, and a maximum elongation after fracture of 40.8%. This invention, through heat treatment process control and Gd alloying, produces a hierarchical heterostructure magnesium alloy with excellent comprehensive mechanical properties.

The application discloses a high-performance titanium alloy material for promoting spheroidization and a preparation method thereof, and belongs to the field of high-strength and high-toughness titanium-based alloy materials, and comprises the following steps: high-purity raw materials are smelted into titanium-based alloy button ingots containing different tin element contents by using a vacuum induction smelting furnace; after homogenization treatment of the titanium-based alloy button ingots, a high-performance titanium alloy material is obtained by adopting a sectional hot rolling process; and the high-performance titanium alloy material is subjected to mechanical property testing, and the longitudinal mechanical test results are as follows: yield strength is 880-1080 MPa, tensile strength is 1020-1220 MPa, and elongation is 12.5-23%; and the transverse tensile test results are as follows: yield strength is 920-1100 MPa, tensile strength is 1050-1290 MPa, and elongation is 11-20%. The Ti80 zirconium element is replaced by doping of the tin element, and the rolling process is controlled to promote spheroidization of the structure, so that the strength and ductility of the titanium-based alloy are improved.

This invention discloses a cast eutectic high-entropy alloy material with strong plasticity and its preparation method, belonging to the field of high-entropy alloy materials. The purpose of this invention is to solve the problem of room-temperature brittleness in existing cast eutectic high-entropy alloys containing the Laves phase. The cast eutectic high-entropy alloy material with strong plasticity is a non-equiatomic CrFeNiMoNbM high-entropy alloy; the atomic ratio of Cr, Fe, Ni, Mo, Nb, and M in the CrFeNiMoNbM high-entropy alloy is (0.8~1):(1.5~2):(1.5~2):(0.1~0.4):(0.3~0.7):(0.01~0.2), where M is Gd, Er, or Y. The cast eutectic high-entropy alloy material prepared by this invention exhibits excellent mechanical properties of high strength and high plasticity, solving the problem of room-temperature brittleness in high-entropy alloys containing the Laves phase.

This invention relates to a high-density, high-strength, and ductile TaNbZr multiphase alloy and its preparation method, belonging to the field of alloy technology. The alloy consists of a Ta phase, a TaNb solid solution phase, and a NbZr solid solution phase. Through multiphase structure design, high density, high strength, and good ductility are synergistically optimized. The preparation method employs a powder metallurgy process of stepwise ball milling and pressure-driven rapid sintering. First, stepwise ball milling disperses excess Ta into different phases, reducing the modulus mismatch caused by Ta and avoiding the formation of brittle phases such as TaZr. Second, pressure-driven rapid sintering achieves good material density, and increasing the heating rate and shortening the holding time reduces elemental diffusion. Finally, a refractory high-entropy TaNbZr alloy with excellent mechanical properties is obtained.

This invention provides a micro-nitrided austenitic-based duplex low-density steel and its preparation method. The preparation method includes: batching raw materials according to the chemical composition of the micro-nitrided austenitic-based duplex low-density steel; melting all raw materials using a melting equipment, controlling the nitrogen content within the range of 0.05-0.15%; casting into ingots or continuously cast billets; homogenizing the ingots or continuously cast billets at 1100-1250℃; forging the homogenized billets; hot rolling the forged billets at a temperature range of 1150-850℃; immediately after hot rolling, water quenching and rapid cooling to room temperature; and annealing the water-quenched steel plate at 850-1050℃. This invention utilizes inexpensive nitrogen (N) to combine with the existing Al (Al) element in steel, and through a simple annealing process, can generate a large number of dispersed AlN strengthening phases in situ, achieving low-cost and efficient precipitation strengthening.

The application provides a high-strength plastic and conductive copper-based composite material and a preparation method and application thereof, and belongs to the technical field of copper-based metal composite materials.The high-strength plastic and conductive copper-based composite material provided by the application comprises a copper matrix and silver modified MXene uniformly dispersed in the copper matrix; the silver modified MXene comprises silver nanoparticles and layered MXene nanosheets; the silver nanoparticles are uniformly distributed on the surface and in the interlayer gap of the layered MXene nanosheets; and the mass of the silver modified MXene is 0.1-0.8% of the mass of the high-strength plastic and conductive copper-based composite material.The high-strength plastic and conductive copper-based composite material provided by the application can avoid the problems of easy agglomeration and poor interface in the process of compounding two-dimensional carbon material MXene nanosheets with metal copper, and can make the composite material have high strength, plasticity and conductivity.

This invention discloses high impact-resistant Ti 2 The method for preparing medium-thick AlNb alloy plates is as follows: Step 1: Using NbTi master alloy, HTi, Al alloy, and Mo65Al master alloy as raw materials, all raw materials are pressed into an electrode block and subjected to three VAR melting processes; Step 2: Ti alloy is prepared using a free forging method. 2 AlNb alloy free forging slab; Step 3: Using hot rolling method, Ti 2 AlNb alloy free-forged slabs are rolled into Ti 2 AlNb alloy medium-thick slabs are then straightened; Step 4: The straightened Ti... 2 AlNb alloy medium-thick slabs undergo double heat treatment followed by machining to obtain Ti. 2 AlNb alloy medium-thick plate finished product. This method solves the problem of existing Ti 2 AlNb alloy plates suffer from insufficient impact resistance, complex preparation processes, and poor microstructure uniformity. High-impact Ti alloys were also disclosed. 2 AlNb alloy medium-thick plate.

This invention relates to a high-strength multiphase hot-rolled wire rod for 2300MPa grade stranded wire and its manufacturing method. The method involves rolling high-carbon Mo-V wire rods into wire rods, followed by online molten salt segmented quenching and isothermal treatment. The wire rods undergo a first-stage molten salt treatment with a cooling rate of ≥39℃ / s, transitioning from austenitic to bainitic phase and promoting partial austenite transformation. A second-stage molten salt treatment further increases the molten salt temperature, promoting the decomposition of untransformed residual austenite into sorbite, followed by isothermal tempering. Finally, slow cooling via roller conveyors results in a hot-rolled wire rod with a microstructure consisting of tempered bainite, tempered sorbite, and ferrite, forming a multiphase microstructure. This method enables multiphase microstructure control and online toughening, balancing material cost and production efficiency, achieving a tensile strength of 1552~1602MPa and a reduction of area of ​​32%~38%, thus eliminating the need for offline heat treatment and enabling efficient production of ultra-high-strength stranded wire.

The invention discloses a TWIP effect metastable state austenitic steel welding method, a welding device is provided with a material conveying cavity, the material conveying cavity is sequentially connected with a first-stage material conveying cavity and a second-stage material conveying cavity from top to bottom, and a spiral material conveying assembly extends into the first-stage material conveying cavity from the top; the lower end of the second-stage material conveying cavity is connected with a stirring head; a channel communicated with the second-stage material conveying cavity is embedded in the stirring head; a heating assembly is installed outside the second-stage material conveying cavity. According to the method, austenite stable elements or reinforced particles are mixed into a welding seam, the austenite stable elements are accelerated to be quickly diffused into austenite by utilizing the thermal diffusion effect and the pipe dislocation diffusion effect, and a welding joint containing the austenite is obtained through quenching partition heat treatment; in addition, the severe plastic deformation can obviously refine grains, and the austenite grain size refinement can also improve the austenite stability; meanwhile, a welding area is fully heated, so that a large number of annealing twin crystals are formed in a welding seam; based on the method, high-quality welding of the metastable-state high-strength steel is achieved.