263 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 relates to a high-strength complex-phase hot-rolled wire rod for a 2160MPa-grade stranded wire and a manufacturing method of the high-strength complex-phase hot-rolled wire rod, after high-carbon components containing trace Nb are rolled and spun into a wire rod, the wire rod is subjected to online molten salt micro-quenching isothermal treatment, so that the wire rod is firstly subjected to front-section molten salt treatment and enters a bainite phase region from an austenite state, part of the austenite is promoted to be converted into bainite, and then the high-strength complex-phase hot-rolled wire rod is obtained. The method comprises the following steps: carrying out high-temperature tempering on the residual austenite, carrying out post-section molten salt treatment, increasing the molten salt temperature, promoting the unconverted residual austenite to be decomposed and converted into sorbite, carrying out isothermal tempering, and finally carrying out roller way slow cooling to prepare the hot-rolled wire rod of which the microscopic structure comprises a complex-phase structure consisting of tempered bainite, ferrite and tempered sorbite, so that network carbides and martensite structures can be inhibited, and the tensile strength of the hot-rolled wire rod is improved. And the structure type and toughness are regulated and controlled on line, the tensile strength is 1472-1505MPa, the percentage reduction of area is 31%-36%, the work hardening rate and the production efficiency of the hot-rolled wire rod are improved, and the production energy consumption is reduced, so that a high-strength grade stranded wire is obtained.

The alloy wire comprises the following components in percentage by mass: 0.1 to 6.0 weight percent of Sn, 0.1 to 0.3 weight percent of Ag, 0.01 to 0.20 weight percent of Zr, 0.02 to 1.00 weight percent of Y, 0.02 to 2.00 weight percent of Ce, 0.01 to 0.80 weight percent of Eu, 0.01 to 0.50 weight percent of Rb, Y / (Ce + Eu + Rb) is more than or equal to 0.8 and less than or equal to 1.2, and the balance of Cu and inevitable impurities of which the total amount is less than or equal to 0.05 weight percent. According to the invention, Ag and Zr are added into the copper-tin alloy wire in component design, and composite rare earth elements are also added, so that the addition amount of each rare earth element is limited, and in order to further improve the processability and comprehensive performance of the alloy wire, the addition amount of each rare earth element is limited; and finally, the preparation process of vacuum melting-continuous casting technology-multi-pass drawing combined with on-line dynamic annealing process treatment is combined, so that work hardening and internal stress of the wire are eliminated, the machining precision, plasticity and conductivity of the wire are improved, the material performance is more uniform, and the subsequent deformation or cracking risk in use is reduced.

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 discloses a high-performance wide precision zirconium alloy strip as well as a preparation method and application thereof. By strictly controlling the content of key elements in the zirconium alloy raw material and the structure before cold rolling, the deformation resistance is reduced, and the processing plasticity is improved; the material, the roll shape curve and the surface quality of a cold rolling working roll suitable for cold rolling of the zirconium alloy strip are strictly controlled, the rolling stability is improved, the strip thickness-rolling parameter matching relation is established in stages, the pass deformation is improved, and work hardening is reduced; small-angle oblique welding seam tailor-welding is adopted, so that welding seams sequentially pass through a rolling deformation area, the average unit pressure of the welding seams is reduced, welding seam cracking is reduced, tailor-welding coiling cold rolling stable control over the wide precision zirconium alloy strip is achieved, and machining of the precision strip with the width larger than or equal to 500 mm and the thickness smaller than or equal to 0.2 mm can be achieved.

The invention discloses a preparation method of a heterostructure high-performance metastable beta titanium alloy capable of inducing a deformation mechanism in a multilevel and sequential mode, and belongs to the technical field of metal materials. The method comprises the following steps: firstly, carrying out hot rolling in a beta single-phase region to prepare a blank and crushing coarse grains; substructures such as twin crystals and martensite are introduced through cold rolling; and through short-time annealing in a beta single-phase region, a multi-stage heterogeneous lamellar structure composed of thick equiaxed crystal grains, deformation recovery crystal grains and fine recrystallized crystal grains in an alternating manner is successfully constructed. The characteristic that twin crystals and martensite induce different stresses under different grain sizes is utilized, during deformation, thick equiaxed grains firstly start a deformation mechanism, and then fine recrystallized grains are activated; and in the later period of plastic deformation, the interior of the primary deformation strip further triggers a secondary deformation mechanism. The unique behavior of'grading-time sequence 'activation of a multi-deformation mechanism along with the increase of the dependent variable enables the metastable beta titanium alloy to keep excellent plasticity, and meanwhile, the work hardening rate is remarkably improved.

The invention relates to the technical field of target materials, and provides a preparation method of an AgPdCu alloy sputtering target material, which comprises the following steps: firstly melting silver and preserving heat, then adding palladium and copper, heating to 1550 DEG C and preserving heat for 1 hour; the alloy liquid is subjected to heat preservation for 1 hour, the cast ingot is poured into a mold to be cooled after being subjected to homogenizing annealing, the cast ingot is obtained, casting stress can be eliminated, the non-uniformity of an as-cast structure is improved, and a more stable material basis is provided for follow-up machining; then the cast ingot is subjected to hot rolling at high temperature and at the machining rate of 85%, coarse as-cast grains can be crushed, the structure can be refined, the material compactness can be improved, and the mechanical property of the target material can be enhanced; 5 passes are conducted, cold rolling is conducted at the machining rate of 15% in each pass, the work hardening degree is controlled through step-by-step deformation, material cracking is avoided, and meanwhile the thickness precision is guaranteed; annealing treatment is performed, so that cold rolling internal stress can be eliminated, material plasticity is recovered, and the strength and processing performance of the target material are balanced; and finally, straightening and linear cutting are carried out.

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 an in-situ composite titanium carbide reinforced titanium-based alloy and a preparation method thereof. The in-situ composite titanium carbide reinforced titanium-based alloy comprises the following chemical components in percentage by mass: 0 < = N < = 0.010%, 0 < = H < = 0.015%, 0 < = O < = 0.2%, 0.10-0.40% of C and the balance of Ti and inevitable impurities. The preparation method comprises the following steps: mixing the titanium powder and the graphite powder, and carrying out metal laser powder bed fusion printing. According to the invention, through in-situ synthesis of nano TiC particles, the size and morphology of the TiC particles are regulated and controlled, so that the mechanical property of the titanium-based alloy is greatly improved. The titanium-based alloy with high strength and excellent elongation is obtained by using a trace interstitial element C, and is independent of solid solution strengthening, second-phase dispersion strengthening or work hardening ways of expensive rare metals such as V, Mo, Nb and the like, so that green and low-cost preparation of the titanium alloy is facilitated.

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 discloses a method for welding zirconium alloy through combination of thermal hydrogen treatment and vacuum thermal compression, and belongs to the technical field of materials and welding. The problem that the zirconium alloy is prone to plastic attenuation in the fusion welding and high-temperature diffusion bonding processes is solved. According to the method, the to-be-welded zirconium alloy element is firstly subjected to thermal hydrogen treatment, hydrogen can reduce the phase transition temperature of the zirconium alloy, then the zirconium alloy is subjected to vacuum hot pressing in the diffusion bonding process, large-scale recrystallization and recrystallization occur in the zirconium alloy under the combined action of temperature and pressure, and crystal grains are refined to a certain extent. And meanwhile, the zirconium alloy subjected to thermal hydrogen treatment can release a large amount of hydrogen, and hydrogen embrittlement of the zirconium alloy is avoided. The vacuum hot pressing process also enables the zirconium alloy to generate work hardening so as to further improve the strength of the zirconium alloy. The welding rate of a zirconium alloy element connector obtained through welding reaches 100%, the shear strength of the connector can reach 450 MPa or above, and the shear elongation reaches 29%.

The invention relates to the technical field of titanium and titanium alloy processing, in particular to a preparation method of a titanium-copper alloy plate or strip, which comprises the following steps: selecting a Ti-5Cu alloy casting blank with the thickness of 60-200mm, the width of 600-2000mm and the length of Lmm; analyzing and measuring the phase transition temperature T1 of the Ti-5Cu alloy casting blank; the method comprises the following steps: coating the surface of a Ti-5Cu alloy casting blank with pure titanium or coating the surface of the Ti-5Cu alloy casting blank with an anti-oxidation coating to obtain an anti-oxidation blank, heating the anti-oxidation blank to T2 = T1 + (25-160) DEG C, and keeping the temperature for 10-60 minutes; carrying out hot rolling on the antioxidant blank subjected to heating and heat preservation at the temperature not lower than 700 DEG C; and the hot-rolled blank is subjected to cold rolling, and the titanium-copper alloy plate or strip with the thickness being 0.2-3 mm is obtained. The hot rolling process is carried out in the interval above the phase transition temperature of the Ti-5Cu alloy, it is avoided that when beta-phase region machining is finished, coarse grains are reserved in metal, and in the cold rolling process, rolling defects caused by work hardening and strip cold rolling are eliminated through vacuum annealing or protective atmosphere annealing, the alloy machining plasticity is recovered, and the strip cold rolling machining performance is improved.

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 present invention relates to a low-cost high-ductility fatigue-resistant core energy-dissipation structure and an anti-buckling energy-dissipation support. The core energy dissipation structure comprises at least a first steel plate and a second steel plate. The second steel plate must be and can only be adjacent to and welded to the first steel plate. The microstructure of each of two types of steel plate material used is mainly a ferrite structure; the yield strength and plastic deformation flow stress of the first steel plate material are both higher than that of the second steel plate material. In a plastic deformation strengthening stage, when true strain is not greater than 0.12, the deformation work hardening rate of the first steel plate material is not less than the deformation work hardening rate of the second steel plate material; and under fatigue deformation conditions of a strain amplitude of 1%, a loading frequency of 0.1-0.2 Hz, and a strain ratio of -1, the room-temperature fatigue life of each of the two types of steel plate material is not less than 500 cycles. The ratio of the allowable limit of displacement to the calculated yield displacement of the buckling-resistant energy-dissipation support of the present invention is not less than 7, and the allowable limit of displacement is not less than 1 / 80 of the length of the buckling-resistant energy-dissipation support.

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 objective of the present invention is to provide a stainless steel pipe that has high strength and excellent hydrogen embrittlement resistance. Having "excellent hydrogen embrittlement resistance" means that, in a tensile test under hydrogen charging, the elongation at break is 9.0% or more and that, when true strain is plotted on the horizontal axis and true stress on the vertical axis in the tensile test, and the true strain at the maximum load is εmax, the rate of change of the work hardening rate dσ / dε with respect to ε, i.e., d2σ / dε2, is −200,000 MPa or more in the range where the true strain is between 0.8εmax and εmax both inclusive. σ denotes true stress (MPa), and ε denotes true strain (no unit). Having "high strength" means that the yield strength is 450 MPa or more.　This stainless steel pipe has a specific structure, in which an average Kernel Average Misorientation (KAM) value, which is an average of KAM values of the steel structure, is between 2.0° and 4.0° both inclusive, and a standard deviation of the KAM value distribution is 1.5° or less.

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 relates to the technical field of metal heat treatment, in particular to medium-carbon structural steel for cold forging hub bearings and a continuous spheroidizing annealing process thereof.The medium-carbon structural steel for the cold forging hub bearings in a hot rolling state is slowly heated to the temperature below Ac1 and then heated to the temperature within the Ac1-Ac3 two-phase region temperature range for heat preservation, the medium-carbon structural steel is cooled to Ar3 according to the set cooling speed for heat preservation, and then the medium-carbon structural steel for the cold forging hub bearings is obtained; and cooling to the temperature below Ar1 according to the set cooling speed, preserving heat, entering a non-heat-supply section, slowly cooling, and discharging from the furnace. According to the method, control over the heating rate below Ac1, heating near Ac3 and grading isothermal treatment near Ar3 and below Ar1 are introduced into a traditional spheroidizing annealing system, optimization regulation and control over the carbide form and distribution state are achieved, the morphology stability of spheroidizing carbide is improved, abnormal structure generation is inhibited, the spheroidizing rate is larger than or equal to 80%, finally, the hardness of round steel is stably controlled within the interval of 160-170 HBW, and the spheroidizing quality is improved. And the work hardening sensitivity and the cracking tendency in the material cold forming process are effectively reduced, and the plasticity and the surface quality of the material are improved.