161 results about "Work hardening" patented technology

The invention discloses a titanium alloy based on lamellar alpha phase and nanophase precipitation and a preparation method of the titanium alloy, belongs to the field of titanium alloy materials, and aims to solve the bottleneck that strength and work hardening of a high-strength titanium alloy are difficult to cooperate. The titanium alloy comprises, by weight, 2.0%-7.5% of Al, 1.0%-6.0% of V, 1%-8% of x (x is at least one eutectoid beta stable element of Fe, Mn, Cr, Ni and Cu) and the balance Ti and impurities. And the beta-phase molybdenum equivalent [Mo] eq is controlled to be 5.0-10.0. The preparation method comprises the following steps: 1) smelting an ingot for three times in a vacuum consumable electric arc furnace, and cutting a dead head after scaling and flaw detection; (2) carrying out hot rolling at 810-950 DEG C in an alpha + beta two-phase region with the accumulative deformation amount of 75-95%, and constructing a multi-scale lamellar alpha phase, and (3) carrying out solid solution for 30-120 minutes at 700-850 DEG C, rapidly cooling at 50-250 DEG C / s, and inducing the precipitation of a nano eutectoid compound. Aging treatment is not needed, the yield strength is greater than 900 MPa, the work hardening amount is greater than 150 MPa, the elongation is greater than or equal to 15%, the process is simple and easy to industrialize, and the method can be applied to the fields of aerospace, ocean engineering and the like.

The invention relates to the technical field of high-strength steel production, in particular to 780MPa-grade forming-enhanced cold-rolled dual-phase steel and a preparation method thereof.The 780MPa-grade forming-enhanced cold-rolled dual-phase steel comprises the chemical components of 0.09%-0.11% of C, 0.25%-0.45% of Si, 1.9%-2.1% of Mn, smaller than or equal to 0.012% of P, smaller than or equal to 0.006% of S, 0.03%-0.05% of Als, smaller than or equal to 0.005% of N, 0.25%-0.35% of Cr, 0.015%-0.025% of Nb, 0.08%-0.12% of Cu and 0.05%-0.09% of Ni, and the ratio of Nb to Cr is 1: 10-1: 12; ceq is equal to 0.38%-0.42%, and the balance is Fe and impurities; the core objective of the invention is to enable the work hardening index n value to be greater than or equal to 0.24 through component collaborative optimization and process precise regulation and control, so that the industrial pain points of insufficient reaming performance and poor formability of the existing 780MPa-grade cold-rolled dual-phase steel are fundamentally solved, and meanwhile, the alloy cost is reduced, and the manufacturability is improved.

The invention discloses a preparation method of a high-strength and high-conductivity aluminum alloy profile, which comprises the following steps: 1) carrying out solution treatment on an aluminum alloy raw material to obtain a supersaturated solid solution; (2) the supersaturated solid solution is subjected to low-temperature extrusion treatment, and the aluminum alloy profile is obtained; and thirdly, the aluminum alloy profile is heated, and the high-strength and high-conductivity aluminum alloy profile is obtained. According to the method, hot extrusion is replaced by low-temperature extrusion, so that the aluminum alloy profile generates a remarkable cold hardening effect, the strength of the alloy is greatly improved, meanwhile, severe plastic deformation at the extrusion temperature generates a large number of intragranular dislocations, Mg and Si elements are promoted to be quickly and fully dispersed and separated out, the alloy generates a precipitation strengthening effect, and the conductivity is improved.

The invention discloses a laser powder bed molten high-strength, high-plasticity and high-work-hardening titanium alloy and a preparation method and application thereof.The preparation method comprises the steps that two kinds of titanium alloy powder with different Mo equivalents are mixed according to a certain mass ratio to form mixed powder, and the mixed powder is put into laser powder bed melting equipment; the titanium alloy is finally obtained through layer-by-layer forming by laser powder bed melting equipment according to a slicing path and process parameters of a three-dimensional model, the microstructure of the prepared titanium alloy comprises hexagonal martensite alpha 'and orthorhombic martensite alpha', and in a preferable scheme, under the condition that heat treatment is not needed, the yield strength of the titanium alloy is larger than or equal to 950 MPa, the tensile strength is larger than or equal to 1250 MPa, and the tensile strength is larger than or equal to 1250 MPa. The alloy has the advantages of high strength, high plasticity and excellent work hardening capacity, can meet the requirements of forming and high mechanical properties of titanium alloy components in complex shapes, and is especially suitable for the fields of aerospace, automobiles, weapon armors, ships, oceans and the like, and the ductility is greater than or equal to 14%, and the work hardening capacity is greater than or equal to 250 MPa.

The invention provides a precision seamless steel tube cold drawing process quality on-line evaluation method, and relates to the technical field of precision seamless steel tube processing, and the technical scheme is as follows: collecting hydraulic cylinder double-cavity oil pressure and steel tube displacement data in real time, and dynamically calculating five parameters including drawing force, change rate, accumulative impulse, rigidity and tensile stress; and establishing a five-stage progressive anomaly judgment mechanism by combining a drawing force reference objective function constructed by historical qualified data: firstly, capturing a pipe breakage risk based on instantaneous overrun of a drawing force change rate; secondly, the work hardening cumulative effect is recognized through the continuous abnormal frequency; and depth verification is carried out by combining an accumulated impulse boundary, a rigidity theoretical range and a material strength threshold value. The method has the beneficial effects that online monitoring of the whole process of the cold drawing process is achieved, the abnormal response speed is greatly increased, and waste of raw materials is reduced; and meanwhile, the consistency of the yield strength of the product is improved by quantifying the work hardening effect, and a process knowledge base is constructed to drive intelligent manufacturing iterative optimization.

The invention discloses a cold-drawing forming reducing device for an aluminum alloy thin-wall pipe, relates to the technical field of pipe cold drawing, and aims to solve the technical problem of insufficient functionality of a traditional cold-drawing device. An auxiliary driving rail frame is arranged on the forming machine body; tensioning driving assemblies are arranged at the two ends of the auxiliary driving rail frame. The axial inner wall gaps of the guide forming penetrating mold, the decreasing mold and the limiting mold form decreasing type drawing, staged drawing treatment is formed through the forming cavity, a pipe is gradually deformed under the continuous action of the multiple molds through multi-mold staged drawing, and the work hardening process is more uniform. Compared with single-die large-deformation drawing, multi-stage drawing avoids the problem of uneven work hardening caused by excessive deformation of the local area of the pipe; and uniform work hardening can improve the overall strength and hardness of the pipe, and meanwhile, certain toughness is kept, so that the pipe has better comprehensive performance in subsequent use.

The invention discloses a method for improving the strength of a narrow-gap laser welding joint. The method comprises the specific steps that S1, firstly, laser welding is used for completing narrow-gap laser welding; s2, electric pulse treatment is carried out on a welding seam formed after welding; and S3, finally, the weld joint is subjected to hot rolling treatment, and the weld joint in the step S3 is subjected to hot rolling treatment for multiple times. After welding, electric pulse treatment is firstly carried out, then hot rolling treatment is carried out, and the strength of a sample can be improved through work hardening generated in the rolling process. Through rolling treatment, the grain size of the sample is changed, the dislocation density is increased, the texture strength is improved, and the Schmidt factor is reduced, so that the strength of the sample is improved; equipment used in the method is simple in structure, easy and convenient to operate and short in consumed time, and the whole treatment process is efficient and rapid.

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

The invention belongs to the technical field of aluminum lithium alloy heat treatment, and provides a heat treatment method for improving the obdurability of an aluminum lithium alloy plate. The heat treatment method comprises the following steps: sequentially carrying out solid solution heat treatment, rolling pre-deformation treatment, pre-stretching treatment and artificial aging treatment on the aluminum-lithium alloy plate. According to the method, through optimized solid solution heat treatment, a second phase separated out of the aluminum lithium alloy plate in the cold deformation state is subjected to solid solution in a matrix, and a supersaturated solid solution of the aluminum lithium alloy plate is obtained; a large amount of dislocation is introduced in rolling pre-deformation, work hardening is introduced, the dislocation density is increased, and the aging precipitation power of the aluminum-lithium alloy plate is improved; residual stress in the rolling pre-deformation process is eliminated through pre-stretching treatment, and the aluminum-lithium alloy plate which is subjected to stress removal and is flat in appearance is obtained; a large number of strengthening phases such as T1 phases and theta'phases are separated out through artificial aging treatment, and strengthening and toughening of the aluminum-lithium alloy plate are achieved; the yield strength reaches 520 MPa or above, the tensile strength reaches 590 MPa or above, and the ductility reaches 8% or above.

This invention discloses a polishing method and apparatus for nickel-based alloys based on photocatalysis and photothickening synergy. It achieves dual-driven processing by simultaneously triggering photocatalytic workpiece surface modification and photo-triggered thickening of the polishing slurry through an integrated dual-light system, realizing surface softening and medium thickening. Composite abrasive particles loaded with TiO2 / ZnO photocatalysts form a low-hardness oxide layer on the nickel-based alloy surface under ultraviolet light irradiation, reducing processing resistance. Precise viscosity control of the polishing slurry is achieved through azobenzene / cinnamic acid photochromic molecules, combined with shear-induced particle agglomeration to form a dual thickening system, improving viscosity stability. This invention solves the technical pain points of work hardening in nickel-based alloys, large viscosity fluctuations in traditional shear-thickening polishing slurries, and poor processing uniformity, improving processing efficiency and workpiece surface quality. It is suitable for efficient and precise machining of difficult-to-machine nickel-based alloys such as Inconel 718 and GH4169.

The application discloses a self-tapping and self-drilling screw connection strength simulation analysis method and relates to the technical field of simulation analysis.The application constructs a three-dimensional geometric entity of a screw and a base material, adopts explicit dynamics to complete dynamic simulation of a tapping process, extracts and reconstructs a thread interface deformation profile and a partitioned work hardening parameter, introduces tapping residual stress into a regular bearing grid through cross-stage inverse distance weighted stress mapping, combines partitioned equivalent contact stiffness and a friction coefficient to complete pre-tightening contact state initialization, carries out axial pulling-out and transverse shearing composite bearing simulation, judges a failure starting position and a final connection strength, and iteratively corrects simulation parameters through a strengthening correction factor based on measured pulling-out force data, effectively solves the problem that traditional simulation ignores tapping residual stress, interface deformation and work hardening effect, and leads to large strength prediction deviation, and significantly improves the prediction precision and engineering applicability of self-tapping and self-drilling screw connection strength simulation.

The invention provides a hot continuous rolling and finish rolling force prediction method fusing machine learning and a mechanism model, and relates to the technical field of metallurgical process control. By integrating a flow stress mechanism model based on a physical metallurgy rule and a data-driven XGBoost machine learning model, the interpretability of the mechanism model and the fitting ability of machine learning to a complex nonlinear relationship are fully exerted; based on a competitive mechanism between a work hardening effect and a recrystallization / phase change softening effect in a metal deformation process, flow stress mechanism model parameters are optimized by taking a flow stress measured value as a target under the guidance of a PSO optimization algorithm, physical mechanism constraints are embedded, and it is ensured that an optimization result conforms to physical reality; according to the method, key variables of chemical components and process parameters are used as input, a machine learning model for softening rate prediction is established based on an XGBoost algorithm, and a prediction result is used as key parameter input of a mechanism model, so that model precision attenuation caused by working condition change is effectively avoided.

The invention belongs to the field of corrosion fatigue performance, and particularly discloses a milling workpiece corrosion fatigue life prediction model construction method and a process parameter optimization method.The milling workpiece corrosion fatigue life prediction model construction method comprises the steps that a surface quality prediction model is constructed based on process parameters and corresponding workpiece surface states obtained through tests, and the workpiece surface states comprise surface roughness and hardness; introducing a fatigue stress concentration factor and a work hardening ratio into the initial fatigue life model to respectively reflect local stress concentration caused by surface topography and machining surface hardening caused by milling, and performing surface roughness correction and surface hardness correction on the initial fatigue life model; obtaining a fatigue life model related to the surface state of the workpiece and the corresponding corrosion fatigue life; and combining the surface quality prediction model and the fatigue life model to form a corrosion fatigue life prediction model of the milling workpiece. According to the method, corrosion fatigue life prediction and process parameter optimization of the nickel-aluminum bronze milling workpiece can be realized, and important guidance is provided for actual processing.

The invention belongs to the technical field of alloy foil preparation, and particularly relates to a preparation method of a FeCrCoW4.5 alloy foil. Comprising the following steps that N passes of cold rolling are conducted on a FeCrCoW4.5 alloy blank, N is larger than or equal to 3, the deformation amount of each pass of cold rolling is 40-70%, annealing treatment is conducted at the temperature of 1000-1200 DEG C after the last pass, work hardening generated by cold rolling is eliminated, final cold rolling is conducted after annealing treatment till the thickness is 0.06 mm, and the alloy foil is obtained. Through multi-pass cold rolling and annealing combined machining, during cold rolling, a large number of dislocation and other defects can be generated in a material, so that the hardness of the material is increased, and the plasticity is reduced; and annealing is carried out after multi-pass cold rolling, atoms in the material can obtain certain energy, dislocation and other defects are rearranged and combined, and part of the defects are eliminated, so that the hardness of the material is reduced, certain plasticity is recovered, and the comprehensive mechanical property of the material is improved.

The utility model is applicable to the technical field of welding, and provides a welding device for work-hardening coil stock, which comprises a sliding component, a base component is mounted above the sliding component in a sliding manner, a stub bar feeding component is arranged on one side of the base component, and a tailing discharging component is arranged on the other side of the base component. A welding plate assembly is arranged above the base assembly, the stub bar feeding assembly comprises a feeding positioning mechanism, the feeding positioning mechanism comprises a positioning bottom plate, the positioning bottom plate is fixedly installed on the base assembly, a first positioning air cylinder is installed on one side of the upper portion of the positioning bottom plate, and a second positioning air cylinder is installed on the other side of the upper portion of the positioning bottom plate. A second positioning air cylinder is installed on the other side of the positioning bottom plate, a positioning plate is installed at the output end of the positioning bottom plate and the output end of the second positioning air cylinder in a connected mode, and the problem that the production efficiency is reduced due to the fact that a machine needs to be stopped and then a new hardened roll material needs to be replaced is solved. And the effect of directly welding two rolls of hardened roll materials together in the working process is achieved.

The invention discloses 220MPa-grade alloyed hot-galvanized phosphorus-containing high-strength steel with high surface quality and a preparation method of the 220MPa-grade alloyed hot-galvanized phosphorus-containing high-strength steel, and the component design of a steel plate has very high economical efficiency by ingeniously utilizing coupling addition among alloy elements; by combining an optimized alloying hot-dip galvanizing process, the alloying hot-dip galvanized steel plate with the yield strength being 220 MPa-260 MPa, the tensile strength being larger than or equal to 360 MPa, the percentage elongation after fracture being larger than or equal to 43%, the plastic strain ratio r value being larger than or equal to 2.2, the work hardening index n value being larger than or equal to 0.22 and the roughness of the upper surface and the lower surface of the steel plate being 0.8-1.8 microns respectively is prepared, and the pulverization resistance of the 60-degree V-bending experiment is of the first level. The automobile outer plate has the advantages of being high in plasticity, high in concave resistance, high in forming performance and high in surface quality.

Disclosed is a gradient twin structure regulation method, comprising the following steps: first step, pretreatment: surface cleaning is performed on a metal workpiece, and annealing pretreatment is performed if necessary, to obtain a uniform initial grain structure. The twin regulation method of the application can significantly optimize the material performance: the obtained material has good matching of strength and toughness, the work hardening rate is increased by 20%-50%, the impact resistance and crack initiation inhibition capacity are significantly enhanced, the service stability is excellent, and the method is suitable for structural parts under extreme working conditions; the method has outstanding process advantages, does not require complex special equipment, can be realized by using a conventional cryogenic device and a rolling mill, has a direct process path, is simple to operate, and has strong repeatability; the method is suitable for a wide range of workpiece shapes and sizes, and is easy to realize industrialization; and the method is convenient for cost control, can reduce energy consumption by 30%-60% compared with existing technologies such as laser impact and low-temperature forging, can increase production efficiency by 2-3 times, and can significantly reduce the cost of industrial application.

The application discloses a hardware wire rod processing device and a process thereof, and belongs to the field of hardware wire rod processing. The device is used for forming hardware wire rods in different ways and comprises a processing shell. An induction heating zone, a rough scale removing zone, a correction zone, a fine scale removing zone and a forming zone are sequentially arranged in the processing shell from an input side to an output side. The wire rod is heated and softened first, and then is subjected to multi-directional roller correction. Surface damage and work hardening defects which are easily generated in traditional hard-state correction are overcome. On the basis, a treatment mode combining hot air rough removal and talcum powder gas-solid two-phase flow flexible grinding is adopted. The treatment mode realizes efficient scale cleaning and simultaneously forms a dry lubricating layer on the surface of the wire rod, solves the problems of incomplete single descaling mode and easy damage to the base, and further realizes automatic scale discharge and effective control of operation dust through the rotatable sealing collection structure and the multi-stage dust guide system, so that the wire rod processing quality and the operation environment are remarkably improved.

The invention discloses a high-performance tungsten alloy bar and a preparation method thereof, and relates to the field of tungsten alloy preparation.The preparation method comprises the following steps that composite powder is prepared into a pressed blank and then subjected to multi-section sintering, and a bar a is obtained; wherein the hard phase and the soft phase in the bar a are in an isotropic uniform dispersion shape; the bar a is subjected to high-temperature deformation treatment, and a bar b with a hard phase and a soft phase initially oriented in the axial direction and refined grains is obtained; the bar b is subjected to multiple times of cooling deformation treatment, and a bar c is obtained; the hard phases and the soft phases of the bar c are alternately arranged in the deformation direction to form a composite structure. And the bar c is subjected to multiple times of aging treatment, and the high-performance tungsten alloy bar with the two phase interfaces anchored mutually in the composite structure is obtained. According to the high-performance tungsten alloy bar and the preparation method thereof, the problems that work hardening is serious, plastic processing difficulty is large, and toughness is prone to being damaged are effectively solved, and collaborative optimization of strength and toughness is achieved.

The invention belongs to the technical field of metal material machining, and particularly relates to a machining strengthening method for improving the mechanical property of a ferritic stainless steel bar and a product. The method comprises the following steps: carrying out solution treatment on the ferritic stainless steel bar to enable the initial grain size of the ferritic stainless steel bar to be 220 + / -5 microns to 245 + / -5 microns; the bar obtained after solution treatment is placed in a room temperature environment, and forward and backward reciprocating torsional deformation is conducted on the ferrite stainless steel bar through torsional equipment; and the ferrite stainless steel bar forms a microscopic gradient structure from the core part to the surface. A traditional one-way torsional deformation bar machining strengthening method is innovatively converted into reciprocating torsional deformation, on the basis that the macroscopic size of a bar is not obviously changed, a gradient microstructure gradually changing from the center to the surface is built in the bar, and the gradient microstructure effectively refines crystal grains and introduces high-density dislocation, so that the mechanical property of the bar is improved, and the mechanical property of the bar is improved. Therefore, the yield strength and the tensile strength of the material are remarkably improved.

The high-strength high-conductivity copper-silver alloy disclosed by the application has the following weight percentage composition: 0.5-12% of Ag, 0.1-1.5% of B, 0.1-2.0% of Mn, the balance of Cu and inevitable impurities. The application simultaneously adds Mn and B elements in the Cu-Ag alloy to form a high-melting-point B-Mn compound at high temperature, thereby improving the strength of the alloy, having little influence on the electrical conductivity, and due to the combined action of the dispersion strengthening of the high-melting-point hard B-Mn compound and the work hardening of the Ag fiber phase and Cu matrix, the alloy has excellent comprehensive properties such as thermal stability, tensile strength, hardness and electrical conductivity. The tensile strength of the alloy is above 600 MPa, the electrical conductivity is above 65% IACS, the Vickers hardness is above 200 HV, and after being kept at 180 DEG C for 24 hours, the reduction rate of the tensile strength is not more than 8%, and the alloy can be applied to the power, electronic, communication and electromagnetic conversion industries.

The invention belongs to the technical field of superconducting material processing, and discloses a magic angle graphene modified niobium-tin superconducting wire and a preparation method thereof. The magic angle graphene is modified on the surface of the core wire of the Nb3Sn superconducting wire prepared by the bronze method, the material can eliminate work hardening of a bronze matrix, and one-time and uninterrupted continuous stretching forming from a composite billet to the final wire is realized. In addition, the Nb3Sn superconducting wire has excellent mechanical performance, superconducting performance and strain tolerance, the magic angle graphene layer can effectively inhibit crack initiation and expansion of the Nb3Sn reaction layer under strain, and the mechanical performance of the wire is improved; the material not only can be used as an additional magnetic flux pinning center, but also can induce formation of finer Nb3Sn grains with tough grain boundaries, so that the critical current density of the wire is remarkably improved; the critical current irreversible strain limit of the Ni3Sn superconducting wire modified by the magic angle graphene is 0.8% and is obviously higher than that of a Ni3Sn superconducting wire prepared by a traditional bronze method.

This invention discloses a method for preparing aluminum-titanium layered composite plates based on critical instability control. The method first determines the constitutive parameters of the aluminum skin and titanium core layer, and calculates the critical reduction rate to suppress macroscopic plastic instability of the core layer. Subsequently, a multi-pass low-reduction rolling process combined with intermediate annealing is employed. For the pure titanium core layer, cold rolling is used for thinning, followed by annealing at 600℃ to achieve near-complete recrystallization and eliminate work hardening. For the titanium alloy core layer, warm rolling at 550-600℃ is used for thinning, followed by annealing at the same temperature to induce a microstructure transformation primarily characterized by recovery softening with secondary local recrystallization. This invention, through theoretical guidance and precise control of deformation and heat treatment regime, effectively solves the problems of necking, wavy buckling, and interface delamination in hard core layers, improving the interfacial bonding quality and mechanical properties of the composite plate, and achieving efficient and stable preparation of lightweight, high-strength metal layered composite materials.

The invention relates to a preparation method of a graphene / metal composite material, in particular to a preparation method of a needle-shaped interface graphene / metal composite material. In order to solve the problems that an existing graphene / metal composite material has a weak interface and harmful interface reaction is likely to happen, a needle-shaped interface phase is constructed in situ between graphene and a metal matrix, the needle-shaped interface phase is a needle-shaped interlocking interface, the load transmission efficiency is improved through mechanical anchoring, and the mechanical performance of the graphene / metal composite material is improved. The needle-shaped structure can effectively resist shear stress and interface slippage, so that the bearing capacity and the stability of the interface are greatly improved, and the strength far higher than that of a flat and straight interface composite material is obtained. And continuous work hardening is provided through subsequent induction of dislocation proliferation and pinning dislocation. The method is used for various metals such as aluminum, magnesium, copper and titanium and alloy systems thereof, and has universality.

The invention provides a wire rod for a high-fatigue steel strand and a preparation method of the wire rod. The wire rod comprises the following components in percentage by weight: 0.77-0.87% of C; 0.20%-1.0% of Si; 0.60% to 0.90% of Mn; cr: 0.02 to 0.30%; 0.01 to 0.03 percent of Ti; n: 0.004 to 0.008%; and the balance of iron and impurities. By controlling the components of the wire rod and combining with the preparation process to control the internal phase transition temperature and the surface layer tempering temperature of the wire rod, the double-phase structure of the surface layer tempered sorbite and the internal sorbite is obtained, and the double-phase structure makes the hardness of the surface layer not higher than that of the interior after cold drawing of the steel wire by utilizing the characteristic that the work hardening rate of the tempered structure is low; and meanwhile, the strength of the steel wire is not influenced, so that the fatigue performance of the steel strand can be obviously improved.

This invention provides a high-performance, low-cost titanium alloy that is easily cold-workable and heat-treatable, and its preparation method, belonging to the field of titanium alloy preparation technology. By mass percentage, it contains the following components: Cr 3.5~7%, Mo 1~3%, Al 0~1.7%, Zr 0~0.8%, Fe 0~1%, with the balance being Ti and unavoidable impurities, wherein Al, Zr, and Fe are not simultaneously zero. By rationally controlling the content and ratio of each alloying element, and after processing and heat treatment, the annealed alloy exhibits a room temperature fracture elongation exceeding 40%, a strength of approximately 800 MPa, a work hardening rate of approximately 7.5 MPa / %, and excellent cold-working performance; after aging, the strength reaches approximately 1000 MPa, and the fracture elongation exceeds 10%, making it suitable for heat treatment strengthening. Simultaneously, this alloy does not contain expensive elements such as V and Nb, and has a low Mo content, resulting in low raw material costs, achieving a balance between high performance and low cost.

Aluminum alloy suitable for high-pressure casting and capable of hardening at elevated temperatures, the alloy containing: at least 84 percent by weight of aluminium (Al); 9.5 to 13 percent by weight silicon (Si); 0.2 to 0.6 percent by weight of magnesium (Mg); and also 0.1 to 2 percent by weight of iron (Fe); Contains 0.1 to 2 percent by weight of manganese (Mn); where the weight percent ratio Mn:Fe is 0.5 to 3 and the total amount of Mn + Fe is 0.5 to 2.0 weight percent; and the alloy is essentially free of copper (Cu), with the copper content being < 0.01 percent by weight; and The alloy exhibits a eutectic phase in the range of 15-16 volume percent and hardening occurs in a temperature range of 500 °C to 650 °C.

The invention discloses a cold-roll steel sheet high-speed longitudinal shearing and slitting device, which relates to the technical field of cold-roll steel sheet shearing, and comprises a shearing assembly for cutting a cold-roll steel sheet coiled material, and a pretreatment box is arranged on the front surface of the shearing assembly. When the device is used, the electromagnetic rod and the rolling motor are started, the rolling motor drives the driving gear to rotate and drives the two driven gears to rotate reversely, the two toothed bars are driven to rotate through the toothed ring, the upper rolling roller and the lower rolling roller are further driven to rotate, and the two side edges of a cold-rolled steel plate are subjected to electromagnetic rolling. And in cooperation with an eddy current sensor and a PLC, the magnetic field force is intelligently and dynamically adjusted according to the edge conditions of different hardness, and flexible hardening removal is achieved. And then the U-shaped focusing induction coil is started, local rapid heating of the hardened layer is achieved, the hardness is restored to be close to that of the base body, namely work hardening elimination and magnetic rolling modes are combined with local heating softening, and full-thickness softening is achieved in a combined mode.

The present application belongs to the technical field of non-ferrous metal processing, and relates to a process for producing high longitudinal elongation rate aluminum foil by using cast-rolling aluminum foil blank, comprising: selecting 8079 alloy aluminum foil blank, the blank being prepared by cast-rolling method, and the components of the blank being Si: 0.05-0.08%; Fe: 1.0-1.2%, and the rest being constant; rolling the blank in four passes, the four passes being divided into two passes of blooming, one pass of medium rolling, and one pass of finishing rolling; wherein, the roughness of the rolling rolls used in the passes of blooming, medium rolling and finishing rolling is 0.28-0.32, 0.11-0.12 and 0.06-0.08 respectively, the rolling oil temperature during the four passes of rolling is greater than or equal to 60 DEG C; slitting and annealing. The present application increases the temperature of the deformation zone by increasing the rolling oil temperature, so that the work hardening of the grain morphology of the aluminum foil during the rolling process is slowed down, the problem of low longitudinal elongation rate of the aluminum foil produced by the cast-rolling material for a long time is solved, the cast-rolling blank is effectively used to replace the hot-rolling blank to produce high-grade aluminum foil, and the production cost is reduced.

The invention provides a laser powder bed molten high-strength and high-plasticity TA15 titanium alloy and a preparation method and application thereof. TA15 titanium alloy powder is molten through a laser powder bed to prepare the titanium alloy, the organization structure of the TA15 titanium alloy comprises primary beta grains and a martensite multi-scale heterostructure, the average length-diameter ratio of the primary beta grains is smaller than or equal to 3.8, the martensite multi-scale heterostructure comprises large martensite grains and small martensite grains, and the average length-diameter ratio of the large martensite grains is smaller than or equal to 3.8. The large martensite grains are martensite grains with the grain size larger than or equal to 2.5 micrometers, the small martensite grains are martensite grains with the grain size smaller than 2.5 micrometers, the average length-diameter ratio of the large martensite grains is smaller than or equal to 5.8, and the average length-diameter ratio of the small martensite grains is larger than or equal to 3.5. The titanium alloy shows high-strength and high-plasticity performance and excellent work hardening capacity under the condition that heat treatment is not needed, the application requirements for forming and high mechanical performance of titanium alloy of a complex shape structure can be met, and particularly the application requirements for aerospace, weapon armor, ocean and the like are met.