8results about How to "Uniform plastic deformation" patented technology

The invention discloses fine-grain molybdenum-lanthanum alloy molybdenum powder and a preparation method thereof.The preparation method specifically comprises the steps that rare earth lanthanum salt hydrate and deionized purified water are put into a stirring tank to be mixed and stirred, and a rare earth lanthanum salt solution is obtained; preparing doped molybdenum dioxide by using a rare earth lanthanum salt solution and MoO2; and the sample doped with molybdenum dioxide is put into a high-temperature reduction furnace, hydrogen is used for reduction, screening is conducted, and the molybdenum-lanthanum alloy molybdenum powder is obtained. According to the preparation method of the fine-grain molybdenum-lanthanum alloy molybdenum powder, molybdenum dioxide serves as a raw material, the molybdenum-lanthanum alloy molybdenum powder is prepared by adopting soluble rare earth lanthanum salt solution to atomize doped molybdenum dioxide and adopting hydrogen to reduce the doped molybdenum dioxide, La2O3 is dispersed and evenly distributed among fine-grain molybdenum-lanthanum alloy molybdenum powder grains, sintered molybdenum-lanthanum alloy is of a compact and even fine-grain structure, and therefore the fine-grain molybdenum-lanthanum alloy molybdenum powder is obtained. And the plastic-brittle transition temperature of the processed molybdenum metal is reduced, and the toughness and strength of the molybdenum-lanthanum alloy are improved.

The invention discloses an aluminum alloy for preparing a train built-in bogie frame support and a preparation method of the aluminum alloy, and belongs to the technical field of alloys for high-speed trains. The aluminum alloy contains Zn, Mg, Cu, Zr, Ti, Mn, Y, V, Si and other elements, vanadium can form a solid solution and an intermetallic compound with magnesium and aluminum, so that lattice slippage and dislocation movement are hindered, the overall strength of the aluminum alloy is improved, and the aluminum alloy can bear larger external force while keeping light. According to the method, the aluminum alloy is manufactured through two-step superplastic die forging, defects can be prevented from being formed in the die forging process, stress concentration is reduced, and the mechanical property of the aluminum alloy is effectively guaranteed; and after two-step die forging, the alloy is uniform in plastic deformation and small and uniform in grain size, the mechanical property of the aluminum alloy is favorably improved, the aluminum alloy particularly has better fatigue property, and the aluminum alloy has better safety and reliability while light weight of the aluminum alloy is guaranteed.

The invention discloses a cavitation shot peening surface strengthening method and system based on cooperation of high hydrostatic pressure and spherical focused ultrasound. The method comprises the following steps: establishing and maintaining a hydrostatic pressure environment higher than 0.1 MPa in a high-pressure processing cavity filled with a degassing liquid medium; the to-be-machined surface of the workpiece is positioned in a sound field focal region of the spherical focused ultrasound transducer; and in the high hydrostatic pressure environment, a transducer is driven to work so as to generate a cavitation bubble group in a space confinement range in a focal region of the transducer, and meanwhile, the workpiece is controlled to move according to a preset path, so that cavitation collapse impact acts on a target region on the surface of the workpiece. The device comprises a high-pressure processing cavity, a spherical focused ultrasonic transducer, a multi-degree-of-freedom movement mechanism and a control system. Through cooperation of high hydrostatic pressure constraint and the spherical focusing sound field, precise localization and energy strengthening of the cavitation effect are achieved, a plastic deformation layer can be efficiently and controllably introduced to the surface of a metal material, the surface hardness can be remarkably improved, a residual compressive stress layer is formed, surface layer grains are refined, and the method is suitable for precise surface strengthening of complex components.

The invention discloses an aluminum alloy for preparing a traction beam of an external bogie of a train and a preparation method of the aluminum alloy, and belongs to the technical field of alloys for high-speed trains. The aluminum alloy contains Zn, Mg, Cu, Zr, Ti, Mn, Ni, La and other elements, and lanthanum can refine grains, improve the metallographic structure and form a dispersion strengthening phase, so that the strength and toughness of the alloy are improved; the nickel and the aluminum element can form a solid solution, so that the alloy structure is more compact, and the obtained aluminum alloy shows higher resistance when bearing external force and is not prone to deformation or fracture. According to the method, the aluminum alloy is manufactured through two-step superplastic die forging, after two-step die forging, plastic deformation of the alloy is uniform, the grain size is small and uniform, mechanical properties of the aluminum alloy are improved, the aluminum alloy particularly has good fatigue performance, and the aluminum alloy has good safety and reliability while light weight of the aluminum alloy is guaranteed.

This invention relates to a hot-rolled wire rod for 2330MPa grade stranded wire and its manufacturing method. The method involves rolling high-carbon, high-silicon Cr-V wire rods into wire rods, followed by online molten salt isothermal toughening treatment. This process involves a pre-treatment molten salt stage followed by rapid cooling, transitioning the wire rod from an austenitic state to a sorbite phase, forming a predominantly sorbite microstructure. A subsequent molten salt stage further increases the molten salt temperature and reduces the molten salt circulation rate, promoting the continued transformation of untransformed residual austenite into sorbite and isothermal tempering, while also promoting partial melting of sorbite lamellars. Finally, the wire rod undergoes slow cooling on a roller conveyor, resulting in a hot-rolled wire rod with a microstructure consisting of tempered sorbite, ferrite, and melted sorbite. This method controls material costs, achieving a tensile strength of 1558~1608MPa and a reduction of area of ​​34%~39%, while balancing production efficiency and energy consumption. It eliminates the need for offline heat treatment, enabling efficient and stable production of ultra-high strength stranded wire.

The application discloses a process method for rivet buckling and pressure riveting of a main plate of a heat exchanger, and relates to the technical field of heat exchanger manufacturing in a new energy automobile thermal management system. A servo pressure riveting device with a longitudinal ultrasonic excitation function is adopted, a flat head sinking type pressure riveting connection is performed on the main plate and the flow channel plate after pretreatment and coating through multi-stage variable pressure control, ultrasonic energy is synchronously applied during pressure riveting, shear thinning and self-adaptive flow leveling of the pre-coated heat conduction coating medium are caused, the resident air in the microscopic rough gap of the interface is discharged, and internal residual stress is eliminated through the acoustic plastic softening effect of the material. The application has the advantages that the ultrasonic auxiliary pressure riveting process is combined with the preposition of the phase change heat conduction coating medium, the acoustic control and thermal effect of the ultrasonic wave promote the self-adaptive flow leveling of the heat conduction medium, and the air micro gap remaining in the traditional buckling riveting is completely eliminated. Quantitative comparison tests show that.

The invention relates to a cold-press forming and heat treatment method for a spherical composite metal plate. The method comprises the steps of cold-press forming of the spherical composite metal plate, detection after cold-press forming, charging and heat preservation of a heat treatment part, discharging and air cooling of the part, and inspection after heat treatment. The plate is subjected to annular cold pressing from the edge to the center according to preset parameters in stages, gradual uniform plastic deformation of the plate is achieved, and local stress concentration and elastic resilience are remarkably reduced. And in combination with detection after cold pressing forming, the problems that precision control is difficult and the rebound amount is large in the spherical composite metal plate machining process are fundamentally solved. And meanwhile, the heat treatment process is optimized, the residual stress of the spherical composite metal plate is fully released, and then the forming precision and the surface quality of the spherical composite metal plate subjected to heat treatment are improved.

The invention relates to a forging method of an ultra-long two-phase titanium alloy forged plate. The forging method comprises the steps of high-temperature cogging forging, recrystallization forging, homogenizing forging and pre-forming forging and forming forging. According to the method, a reversing drawing-out process is introduced in the high-temperature cogging and low-temperature preforming processes, so that uniform deformation of the interior of a material is effectively promoted, the mechanical properties of a forged plate in the length direction, the width direction and the thickness direction reach high consistency, and meanwhile, the mechanical properties of the forged plate in the length direction, the width direction and the thickness direction are greatly improved. And the temperature, deformation, pressing speed and other parameters in the forging process are precisely controlled, forging defects are reduced, the yield is further improved, the production efficiency is improved through the whole process, the production cost is reduced, the batch stability of forged plates can be guaranteed, and the requirements of the aerospace field and other fields for high-performance titanium alloy forgings are met.