82 results about "Dynamic recrystallization" patented technology

The invention relates to the technical field of aluminum alloy wire processing, and particularly discloses a high-modulus high-conductivity heat-resistant aluminum alloy material, an aluminum wire, a preparation method and a power transmission cable. According to the high-modulus, high-conductivity and heat-resistant aluminum alloy material provided by the invention, the nanoscale TiB2 particles and the micron-sized SiC particles are compounded in the aluminum alloy powder, a dual-reinforcement system is constructed, and the mechanical property and the electrical property of an aluminum conductor are synergistically improved. The invention further provides a preparation method of the high-modulus and high-conductivity heat-resistant aluminum conductor. According to the process, a multi-stage coupling plastic processing technology of hot extrusion, continuous rolling, drawing and surface treatment is adopted. The grain structure is refined through the dynamic recrystallization effect in the series of machining processes, oxidation film defects on the surface and in the structure are damaged through plastic deformation, the rigidity and the conductivity of the aluminum wire are further optimized, and the technical bottleneck that high modulus, high conductivity and heat resistance of traditional aluminum alloy are difficult to consider at the same time is effectively solved.

The invention belongs to the field of advanced metal plastic processing, and particularly relates to a difficult-to-deform metal ultra-thin strip rolling device and method.The device comprises an uncoiler, a high-strength rolling mill and a coiler which are sequentially arranged, and the inlet side and the outlet side of the high-strength rolling mill are each provided with a pair of equal-diameter rollers; the equal-diameter roller is composed of a copper conductive roller and a ceramic insulating roller, the copper conductive roller on the inlet side and the copper conductive roller on the outlet side are electrically connected to the positive electrode and the negative electrode of the pulse power source respectively, and a strip blank on the uncoiling machine sequentially penetrates through the equal-diameter roller on the inlet side, the high-strength rolling mill and the equal-diameter roller on the outlet side and then is wound on the coiling machine. And a working roll, which is in contact with the strip blank, on the high-strength rolling mill is an insulating ceramic working roll. The pulse current in the method can induce dynamic recrystallization, an ultra-fine grain or nanocrystalline structure is obtained, and the strength and plasticity matching of the product is superior to those of a traditional process. Meanwhile, long-time high-temperature oxidation can be avoided by adopting pulse current to heat the strip blank, and the surface is bright.

The invention relates to the technical field of metal plate rolling processing, and discloses a rolling strengthening method capable of reducing the rigidity of a metal plate, which comprises the following steps: applying an asymmetric rolling condition to an initial plate to enable the plate to generate a speed gradient in the thickness direction; the plate is subjected to one-pass large-rolling-reduction rolling, and a non-continuously-distributed shear band is formed; the rolled plate is heated to the dynamic recrystallization temperature interval of the plate, and multi-pass small-rolling-reduction warm rolling is conducted on the plate; and in the warm rolling process, dynamic recrystallization of a shear band is promoted to form a grain-refined continuous core layer, complete recrystallization of the surface structure of the plate is inhibited to keep the work hardening state of the plate, and therefore the metal plate with the rigidity lower than that of an initial plate is obtained. According to the invention, a soft core-hard shell heterostructure is constructed in the plate, high strength and low macroscopic rigidity are synergistically realized, the process controllability is strong, and the method is suitable for preparation of high-performance structural materials.

The invention relates to the technical field of aluminum alloy forging, in particular to a forging process capable of reducing reverse forging coarse grains of 6061 aluminum alloy, which comprises the following steps: acquiring a 6061 aluminum alloy ingot, homogenizing and annealing the 6061 aluminum alloy ingot at 480-520 DEG C for 12-16 hours, cooling to room temperature by water, performing ultrasonic flaw detection, performing turning surface treatment, and alternately forging and pressing in three directions, thereby obtaining the 6061 aluminum alloy. The method comprises the following steps: placing a fine-grain 6061 aluminum alloy forge piece in a graded heating furnace, completing sub-dynamic recrystallization, applying directional pressure stress of 50-80MPa to the 6061 aluminum alloy forge piece, analyzing grain boundary characteristic distribution by adopting an electron back scattering diffraction technology, and obtaining the grain boundary optimized 6061 aluminum alloy forge piece with a discontinuous coarse-grain structure through laser shock strengthening and stress relief annealing. According to the method, the problems that reverse forging coarse grains are caused by uneven strain distribution during forging and pressing, and fine grains and high-density nanoprecipitation cannot be effectively obtained and a grain boundary structure cannot be optimized due to the fact that follow-up forging, heat treatment and stress treatment parameters are difficult to accurately control can be solved.

The preparation method of the A1-grade nondestructive inspection high-impact-toughness TC4 titanium alloy large-size bar comprises the steps that a secondary finished product cast ingot is subjected to a multi-heating-number high-temperature single-phase beta-region large-deformation forging process in the cogging stage, and as-cast grains are fully crushed and refined in the modes of axial upsetting, lateral upsetting, diagonal upsetting and the like; then, high-low-high-low repeated forging is conducted at the temperature above and below the phase transformation point, grain homogenization is achieved through high-temperature dynamic recrystallization, an original grain boundary is eliminated, and deformation dead zones of a corner angle area are effectively reduced in combination with multi-heating-number diagonal drawing-out forging; and finally, multi-heating-number forging is conducted in the two-phase region, a heat treatment process is combined, the microstructure form is further optimized, and a lamellar alpha structure is controlled to guarantee the low-temperature impact performance. According to the method, the structure uniformity of the TC4 alloy bar can be remarkably improved, the A1-level nondestructive testing requirement is met, and the method has excellent axial and chordwise mechanical properties and is suitable for ocean equipment and other high-end application fields with strict requirements for the comprehensive performance of materials.

The application provides an aluminum alloy, which comprises the following components in percentage by mass: Zn 4.0-5.0%, Mg 1.2-1.8%, Cu 0.1-0.3%, Zr 0.08-0.12%, Ti 0.02-0.06%, Fe less than or equal to 0.25%, and the balance of Al. The alloy elements containing Zn 4.0-5.0%, Mg 1.2-1.8%, Cu 0.1-0.3%, Zr 0.08-0.12%, Ti 0.02-0.06% and Fe less than or equal to 0.25% are added into a smelting furnace together with pure aluminum, smelted at 700-750 DEG C to form a melt, refined by blowing in inert gas or adding a refining agent, and the gas and inclusions are removed. The application utilizes the shearing force generated by the different rotating speeds of the upper and lower rollers of a differential rolling mill to break the coarse structure, refine the grains, and increase the dislocation density. The aluminum alloy is rolled at 480-500 DEG C to reduce the deformation resistance, promote dynamic recrystallization, maintain the processing performance, and further enhance the performance by 60-70% of the total deformation. After rolling, the aluminum alloy is subjected to multi-directional forging, the strain direction is changed multiple times, the grains are broken, the structure is homogenized, and anisotropy is eliminated, so that the comprehensive performance and application range of the aluminum alloy profile are improved. The problem that the structure cannot be refined and the dislocation density cannot be increased during the rolling process is solved.

The invention relates to the technical field of titanium alloy solid-phase pressure friction welding, in particular to a complex uniform-section titanium alloy profile deep cavity curved surface linear friction welding reinforcement process method which comprises the following steps: S1, equipment preparation: a titanium alloy Y profile and a rib plate are respectively clamped in an upsetting cylinder and a vibration cylinder of a hydraulic linear friction welding platform; the alignment precision is controlled to be smaller than or equal to 0.05 mm and the hydraulic clamping force is controlled to be smaller than or equal to 40 kN through a fine adjustment S2, parameter setting: based on finite element simulation, setting the amplitude of + / -5mm, the frequency of 50Hz, the friction pressure of 70kN, the upsetting pressure of 75kN, the upsetting time of 30s and the axial shortening amount of 5mm, and adopting a displacement control mode; according to the method, the reserved sectional area of the blank is reduced, the load and energy consumption of extrusion equipment are reduced, the manufacturing period is shortened, the material utilization rate is increased, the joint structure uniformity is improved through thermal-mechanical coupling regulation and dynamic recrystallization, the forming precision is improved, cutting waste liquid and dust emission is avoided, and the technological process is low-carbon and energy-saving.

This invention discloses a simulation method for the asymmetric aluminum profile extrusion process, specifically relating to the field of metal forming simulation technology. The method involves: constructing an asymmetric profile geometric model and extracting key structural parameters; establishing a multi-cavity welding die thermo-mechanical coupling simulation model; constructing a dynamic recrystallization microstructure evolution model; setting initial extrusion process conditions and performing finite element simulation; comparing the simulation results with historical conditions to identify abnormal regions and extract flow trajectory feature vectors; combining microstructure parameters to invert the microstructure evolution path and generate a defect prediction matrix; solving for the optimal process parameters using a numerical optimization algorithm and re-simulating to verify whether the microstructure and stress field distribution meet the standards. This method can achieve prediction of microstructure defects and intelligent optimization of extrusion parameters, improving the quality control capability of the asymmetric profile extrusion process.

The invention provides the application of controlling the finish rolling temperature of hot finish rolling in the aspect of reducing the grain size of the sheet in the preparation of the 2A12-O state aluminum alloy sheet. And the finish rolling temperature of the hot finish rolling is 230-250 DEG C. The invention further provides a method for preparing the 2A12 aluminum alloy sheet for improving the grain size of the 2A12-O alloy sheet. By optimizing hot rolling process parameters, increasing cooling emulsion flow, improving pass deformation and strictly controlling the finish rolling temperature, low-temperature rolling of the plate in the hot finish rolling stage is achieved on the basis that the surface quality of the plate is effectively guaranteed. The process not only inhibits dynamic recrystallization of the plate in the hot rolling process, but also enhances the cold deformation energy storage of the plate, so that the grains of the plate are finer after the finished product is annealed. The rolling process is improved, low-temperature rolling of hot finish rolling is realized, cold deformation energy storage of the plate is increased, grains of the plate are fine after a finished product is annealed, and the surface quality of the plate is effectively guaranteed.

This application provides a method for preparing aluminum alloy welding wire with high production efficiency, low cost, and good product performance, as well as the aluminum alloy welding wire itself. The method for preparing the aluminum alloy welding wire includes the following steps: aluminum molten metal melting, furnace refining, ultrasonic degassing, online filtration, continuous casting and extrusion, rod drawing, intermediate annealing, and finished product drawing. The continuous casting and extrusion process directly obtains the welding wire rod blank from the molten aluminum, resulting in a simple process and high yield. The aluminum alloy structure undergoes severe shear deformation and is fully broken, resulting in a dense welding wire rod blank with sufficient dynamic recrystallization, exhibiting good drawability. Only one intermediate annealing step is required to draw it to the finished product size, resulting in high production efficiency and low cost. The aluminum alloy welding wire is composed of the following components by mass percentage: Zn 4.5-5.2%, Mg 1.2-1.8%, Cu 1.5-2.0%, Mn 0.2-0.5%, Cr 0.1-0.3%, Zr 0.05-0.2%, Ce 0.05-0.15%, Y 0.05-0.15%, Si≤0.05%, Fe≤0.08%, with the remainder being Al and unavoidable impurities.

This disclosure provides a process for preparing fine-grained nickel-titanium shape memory alloy rods for medical use, comprising: forging a heated nickel-titanium alloy ingot through multiple passes, performing multiple high-temperature continuous rolling passes, and then performing thermomechanical treatment to obtain fine-grained nickel-titanium shape memory alloy rods. This invention, through a combination of specific multi-pass forging and strictly temperature-controlled high-temperature continuous rolling, utilizes a robust dynamic recrystallization mechanism to fundamentally refine and homogenize the austenitic matrix grains, and completely breaks down the continuous brittle Ti2Ni phase distributed along the grain boundaries into a randomly dispersed distribution, thereby obtaining fine-grained nickel-titanium alloy rods with high purity and excellent microstructure. This solves the practical problems caused by the coarse grains and brittle phase segregation of the original cast nickel-titanium alloy, such as easy intergranular fracture, difficult processing and forming, low yield, and poor fatigue life in medical applications.

The application discloses a manufacturing method of an ultra-low-temperature high-strength non-magnetic austenitic stainless steel rod, which comprises the following steps: forming a fine-grain protective layer on the surface of a steel ingot by radial forging, small-deformation high-frequency forging and breaking down, so as to reduce the cracking risk in the fast forging process; increasing the forging ratio by fast forging, upsetting and elongating; and making the structure of the center of the steel ingot recrystallize to a certain extent; and finally, forming the steel rod by radial forging, large-deformation low-frequency forging and breaking down, so that dynamic recrystallization occurs in the whole cross-section of the steel rod, and uniform equiaxed crystals are formed, thereby solving the problems of multiple forging times, easy surface cracking and poor structure uniformity of the ultra-low-temperature high-strength non-magnetic austenitic stainless steel rod.

This invention discloses a fine-grained, high-strength, and tough deformation heat treatment method for large-section ring components, relating to the field of aluminum alloy ring components. The key technical points are: S1: raw material proportioning; S2: raw material smelting; S3: raw material impurity removal; S4: forging and ring making; S5: ring component preheating and heat preservation; S6: rolling and grain breaking; S7: first low-temperature annealing; S8: room temperature cold rolling; S9: second low-temperature annealing; S10: cyclic rolling, solution treatment, and aging treatment. This invention introduces a multi-pass deformation heat treatment coupling process involving high-temperature rolling, low-temperature intermediate annealing, room temperature cold rolling, and second low-temperature annealing, and sets up a multi-cycle rolling annealing process. This can release the rolling internal stress of large-section ring components layer by layer, continuously break up coarse grains, induce uniform dynamic recrystallization, and avoid uneven grain structure.

The application provides a hot working method for significantly improving the dynamic recrystallization volume fraction of a nickel-based superalloy, which comprises the following steps: firstly, placing Inconel 625 alloy into a heat treatment furnace at 1000-1100 DEG C and keeping it for 30-90 min for solid solution treatment, and then water cooling; secondly, increasing the temperature of the Inconel 625 alloy after the solid solution treatment to 700-750 DEG C and keeping it for 50-100 h, and then water cooling while applying a stress of 100-160 MPa, so as to uniformly precipitate a delta phase; and finally, increasing the temperature of the Inconel 625 alloy after the aging heat treatment to 870-950 DEG C and keeping it for 2-10 min, and then hot deforming the alloy at a strain rate of 0.1-0.001 s ‑1 The application can obtain a large amount of uniformly distributed delta phase with appropriate size in a short time by applying an external stress, avoids the problem of the delta phase being distributed along the grain and being coarse in size caused by traditional aging heat treatment, ensures that the delta phase fully plays a role in the subsequent hot deformation process by using appropriate process parameters, greatly improves the dynamic recrystallization volume fraction, and has obvious advantages in grain refinement and uniform structure in the hot working process of the nickel-based superalloy.

The application discloses a preparation method of a fine-grain high-purity large-size aluminum plane target, which comprises the following steps: hot processing, cold rolling, annealing treatment and surface treatment. Through multi-pass transverse and longitudinal rolling combined with rapid cooling, the coarse columnar crystal of an aluminum ingot is broken, dynamic recrystallization is induced, and secondary coarsening is inhibited, so that an internal dense aluminum slab is formed; the cold rolling and intermediate annealing introduce a high-density dislocation network, and the static recrystallization driving force is enhanced; the bidirectional temperature gradient annealing realizes the uniform distribution of fine grains, and the uniformity of the structure is improved; and the surface treatment ensures a smooth surface and removes impurities. The method significantly improves the mechanical strength, uniformity and defect control of the target material, meets the high-performance requirements of the large-size aluminum plane target in the manufacturing of super-large displays, optimizes the sputtering efficiency and film thickness consistency, and has remarkable economic benefits and industrial application prospects.

This invention discloses a method for fine-grained billet preparation with low extrusion ratio and synergistic annealing of difficult-to-deform high-γ′ phase superalloys, comprising the following steps: raw material purification and batching preparation – vacuum induction melting – electron beam melting pretreatment – ​​initial molten pool establishment and stabilization melting – homogenization treatment – ​​hot extrusion and annealing heat treatment. The method utilizes electron beam droplet melting directional solidification technology to prepare difficult-to-deform superalloy ingots with continuous columnar crystal structure. Taking advantage of the significantly superior dislocation storage capacity of columnar crystals compared to traditional equiaxed crystals, and combining low extrusion ratio billet preparation with subsequent precision recrystallization annealing, this method effectively avoids the problems of easy cracking, uneven microstructure, and high cost in high extrusion ratio dynamic recrystallization processes, breaking the stringent limitations of traditional processes on the lower limit of the extrusion ratio. Compared with traditional high extrusion ratio billet preparation processes, the material yield is increased from 60%–75% to 80%–90%, an increase of 15%–25%, significantly reducing the extrusion cracking scrap rate and improving the overall microstructure consistency of the bars.

The invention discloses a degradable zinc alloy bar and a preparation method thereof, and relates to the field of medical implant materials.The preparation method comprises the following steps that by mass, 7% of Mg, 0.15% of Li, 0.6% of Mn and the balance Zn and inevitable impurities are mixed and smelted, and an alloy melt is obtained; pouring the alloy melt to obtain a zinc alloy cast ingot; the zinc alloy cast ingot is sequentially subjected to extrusion, drawing and annealing treatment, and a zinc alloy cylindrical bar is obtained; and the zinc alloy cylindrical bar is subjected to multi-section gradient temperature rotary swaging. By adopting a multi-section gradient temperature rotary swaging process, accumulation of deformation stored energy, dynamic recrystallization dominated structure reconstruction, stress relaxation and structure stabilization are realized, and the dislocation density, the grain size and the stress state of the material are cooperatively regulated and controlled; and the degradable zinc alloy bar with better combination of strength and plasticity, lower residual stress and more uniform and stable degradation behavior is obtained.

The application discloses a NiW layered composite metal base strip based on a hot extrusion process and a preparation method thereof, and belongs to the technical field of high-temperature coating superconductor metal base strip preparation. In the process of preparing the layered composite billet, the outer layer of the low-W-content NiW alloy and the inner layer of the high-W-content NiW alloy are subjected to synergistic plastic deformation and dynamic recrystallization under the joint action of a stress field and a temperature field, the oxidation film and the impurity layer at the interface are crushed and extruded, the fresh metal surfaces are fully contacted and atom interdiffusion and new grain interembedding are realized, and thus a dense and continuous metallurgical bonding interface is formed. In the subsequent multi-pass cold rolling process, the good interlayer interface bonding can continuously transmit the interlayer stress and is not prone to cracking. The application can simultaneously complete the compounding and densification of the NiW composite billet in a one-time forming process, significantly improves the production efficiency and reduces the interface defect rate, and will help to promote the large-scale preparation and industrial application of the ultra-long metal base strip.

The application discloses a kind of metal surface nanocrystalline preparation method and application based on controllable fretting friction, belong to material preparation technical field.The method is first to the surface of metal sample pretreatment, subsequently it is placed in fretting friction testing machine, by controlling normal load, displacement amplitude, frequency, time and environmental temperature etc.Parameter, make the pair of mating and sample surface occur fretting friction.The core is, utilize the local transient temperature rise generated in the process of fretting friction, make metal surface layer occur dynamic recrystallization while severe plastic deformation, to form nanocrystalline layer in one step, without secondary heat treatment.The application solves the problems such as long process, high energy consumption and difficult to control surface quality of traditional surface nanocrystallization technology, can prepare the uniform nanocrystalline layer with surface grain size in 200-1200nm and layer thickness in 2-30μm range, significantly improve the corrosion resistance of metal material, and process is simple, controllability is strong, and widely applicable material.

The application provides a high-strength and high-toughness probe and a manufacturing method thereof. The probe material contains components such as chromium, niobium and copper, which can form a strengthening phase and have excellent corrosion resistance. Nitride coating is formed through nitriding treatment, such as chromium nitride, which can form a hard surface and strengthen the wear resistance of the material surface. The surface plating layer can improve the conductivity of the probe. In the process, heat deformation and dynamic recrystallization of the material can be formed through hot rotary rolling process, so as to effectively refine the grain, realize the fine crystallization of the material, effectively reduce the alloy impurities through multiple melting, and improve the purity of the alloy material, so as to effectively enhance the strength and flexibility of the material and prevent the probe tip from breaking. The method has simple equipment, is flexible and reliable, has strong universality, can realize the production of various high-strength and high-toughness probes at low cost, and the material also has excellent corrosion resistance and can be used to manufacture corrosion-resistant high-strength wires.

The invention provides a continuous preparation process of a rare earth copper alloy wire and the rare earth copper alloy wire. The continuous preparation process of the rare earth copper alloy wire comprises the steps of vacuum melting, horizontal continuous casting, nondestructive inspection, continuous extrusion and multi-stage continuous wire drawing which are conducted in sequence, the horizontal continuous casting is conducted under driving of a rotating magnetic field, the working frequency of the rotating magnetic field is 3-10 Hz, and the exciting current is 250-400 A. According to the method, horizontal continuous casting is carried out under driving of the rotating magnetic field, and forced convection driven by the rotating magnetic field can smash primary columnar dendritic crystals, increase nucleation cores and inhibit growth of columnar crystals, so that the rare earth copper alloy rod material with fine and uniform equiaxed crystal structures on the section is obtained; and through continuous extrusion and continuous multi-stage wire drawing treatment, dynamic recrystallization can be further promoted, the grain size of the rare earth copper alloy wire is smaller than or equal to 5 microns, distribution is uniform, and then more excellent strength, toughness and fatigue performance are achieved.

The invention relates to the technical field of metal material processing, and discloses a rolling process for improving electric conduction and heat conduction performance of an aluminum foil for a power battery, which comprises the following steps: monitoring an acoustic emission signal generated by plastic deformation of the aluminum foil in real time when the aluminum foil is subjected to last-pass rolling; when a characteristic transition peak indicating dynamic recrystallization nucleation is monitored, a pulsed magnetic field is synchronously applied in the rolling direction of the aluminum foil, and then the rolled aluminum foil is rapidly cooled on line. The invention further discloses an integrated rolling system for realizing the process. According to the technical scheme, the oriented physical field is applied in the critical stage of dynamic recrystallization, so that the finally obtained aluminum foil forms a crystal texture with high preferred orientation in the rolling direction, the resistivity in the direction is directionally reduced, and the heat conductivity is improved. According to the integrated process, rolling and microstructure regulation and control are combined, independent off-line annealing treatment is not needed, the production period is shortened, and the energy consumption of unit products is reduced.

The embodiment of the invention relates to the field of treatment of iron-based alloys, in particular to a cladding tube suitable for a fast reactor fuel assembly, a preparation method of the cladding tube, a reactor core and a reactor. According to the method, a raw material is subjected to hot extrusion to be subjected to thermal deformation, the appearance size of the obtained pipe blank is changed, meanwhile, metallographic structures in the pipe blank are recombined at the same time, the phenomena of dynamic recrystallization, grain growth and the like are formed, grains can be refined, and a compact tubular structure can be preliminarily formed; the pipe blank is cold-rolled and annealed, so that the strength can be reduced and the plasticity can be improved; normalizing and tempering heat treatment is conducted on the finished pipe, the structure can be further homogenized, grains can be refined, and the mechanical property of the material can be improved. The cladding tube prepared by the method can meet the requirements of a fast reactor fuel assembly on the size precision and deformation control of the cladding tube, reduce the risk of fuel rod damage caused by failure of the cladding tube, improve the critical safety level of a reactor core, and ensure the geometric structure stability of the reactor core, so that a reactor can stably run for a long time.

The invention discloses a high-oxygen high-carbon titanium alloy wire rod and a preparation method thereof, and belongs to the field of nonferrous metal materials. In the aspect of components, on the basis of industrial pure titanium, the room-temperature tensile strength of the industrial pure titanium is improved to 680 MPa or above by remarkably improving the C content in the industrial pure titanium; meanwhile, by means of the promoting effect of C on dynamic recrystallization in the titanium alloy hot working process, the deformation uniformity of the material is improved, and the relative brightness difference from the center to the edge of the material does not exceed 1%. According to the preparation method, in the production mixing stage, the surface of the sponge titanium is sequentially sprayed with the base coating liquid and the mixed fluid of oxygen, carbon and iron, and the adding uniformity of carbon, oxygen and iron is improved; surface cracking prevention measures are adopted in the deformation process, and the surface cracking prevention measures include optimization of the forging ratio and the forging temperature in the cogging forging stage and surface flame oxidation of an isolation layer in the rolling stage. And industrial production of the high-strength titanium alloy wire rod with the good surface is successfully achieved.

The application discloses a kind of for magnesium alloy staged adjustable friction spot welding method, when the plate to be welded is carried out friction stir welding, its welding process parameters are: 1) insertion stage;2) main stirring stage: rotational speed is according to k2=(ω (t) 2 ‑ ω (t) 1) / (t ‑ t1) Linearly decreases, the amount of depression is Δh2, axial load F (t) 2 Constant;3) residence stage: rotational speed is according to k3=(ω (t) 3 ‑ ω (t) 2) / (t ‑ t2) Linearly decreases, axial load linearly rises;4) shrinkage densification stage: rotational speed is according to k4=(ω (t) 4 ‑ ω (t) 3) / (t ‑ t 3 ) Linearly decreases, shrinkage speed is v r The application is by the parameter such as welding step, stirring head rotational speed, axial load and welding time in the welding process Stage coordination and regulation, simultaneously in combination limit the highest temperature of key temperature control area, make weld nugget zone occur orderly plastic flow and controlled dynamic recrystallization in different welding stage, to realize the stable regulation and control of weld nugget zone structure and interface bonding state.

The invention discloses a high-strength and high-plasticity dual-mode magnesium alloy and an orientation regulation and control method thereof, and relates to the technical field of magnesium alloys. The orientation regulation and control method comprises the following steps: carrying out homogenization treatment and pretreatment on an as-cast AZ31 magnesium alloy to obtain a blank, and then carrying out hot extrusion deformation on the blank to regulate and control the grain orientation of the AZ31 magnesium alloy to obtain the high-strength and high-plasticity dual-mode magnesium alloy. According to the method, the grain orientation of the dual-mode AZ31 magnesium alloy is regulated and controlled through hot extrusion deformation, and stable regulation and control of the orientation of the dual-mode AZ31 magnesium alloy can be achieved on the premise that the recrystallization grain fraction and the average grain size are kept stable. By optimizing the extrusion temperature, the extrusion rate and the extrusion ratio, adjustment of a dynamic recrystallization mechanism can be achieved, and the dual-mode magnesium alloy with high strength and good plasticity balance is obtained. The method is simple, short in technological process, low in equipment requirement and suitable for large-scale production, and has good industrial feasibility and popularization and application value.

The invention provides a nickel-based superalloy punch forming control method and system which are used for punch forming of nickel-based superalloy plates and comprise the steps that a condition parameter prediction model is built based on basic material parameters of the plates, and optimal forming condition parameters of the plates are obtained through calculation of the model; according to the condition parameters, overall preheating and local heat compensation are conducted on the plate firstly, and a gradient temperature field meeting the forming requirement is formed; then the plate is stamped in the gradient temperature field environment, and it is guaranteed that deformation is uniform and stable; and finally, the stamped and formed plate is still subjected to partitioned cooling based on the condition parameters, after the temperature of the plate is reduced to the preset cooling temperature, the plate is rapidly ejected out, and the whole precise stamping and forming process is completed. The core pain points that the nickel-based high-temperature alloy plate is difficult to deform, easy to crack, high in resilience and easy to be out of control in dynamic recrystallization can be solved, and the machining efficiency and the machining stability of the nickel-based high-temperature alloy plate in the punch forming process are improved.

The invention discloses a method for improving the high-temperature creep property of a beta-gamma-TiAl alloy, which comprises the following steps: firstly, carrying out wire cut electrical discharge machining and machining on a TiAl alloy ingot to obtain an alloy sample with a smooth surface and without obvious cracks and wire cutting traces, then carrying out multidirectional near-isothermal forging, carrying out 90-degree rotation during each forging, and carrying out heat treatment on the alloy sample to obtain the high-temperature creep property of the beta-gamma-TiAl alloy. And the external force loading direction is continuously changed, so that the hydrogen element in the alloy is fully diffused and removed, and the hydrogen embrittlement phenomenon is effectively inhibited. And meanwhile, the multidirectional stress effect promotes uniform distribution of the internal structure of the alloy, the structure anisotropy caused by single-direction deformation is broken, dynamic recrystallization is promoted to be fully carried out, and grain refinement is achieved. And finally, the creep property of the material is remarkably enhanced through the process, and the complex working condition requirements are met.

The utility model discloses a reinforcing rib forming device and a battery production line, the reinforcing rib forming device comprises a rolling assembly, a driving assembly and an ultrasonic assembly, the rolling assembly comprises a first roller body and a second roller body which are oppositely arranged, and the driving assembly is connected with the first roller body; and when the tab on the pole piece is arranged between the first roller body and the second roller body in a penetrating manner, the ultrasonic assembly is configured to apply ultrasonic energy to the first roller body and roll the tab to form a reinforcing rib. According to the scheme provided by the invention, when the high-frequency vibration of the ultrasonic waves is transmitted to the tab forming area, metal atoms on the tab forming area can obtain additional kinetic energy, crystal grains are dynamically recrystallized, and pores and microcracks are reduced; and meanwhile, the yield strength of metal can be reduced through vibration energy, full plastic rheology of the material is achieved under the smaller rolling pressure, the internal stress distribution of the reinforcing rib is more uniform, and the overall crack resistance and deformation resistance are improved.