28 results about "Ausforming" patented technology

The invention discloses a heat treatment process for improving the obdurability of die steel, and belongs to the technical field of metal heat treatment. The invention relates to a heat treatment process for improving the toughness of die steel, which adopts a die steel material with a specific component proportion, and the die steel material comprises carbon, chromium, molybdenum, vanadium, tungsten, nickel, niobium, niobium carbide and trace boron element. By sequentially implementing austenitizing, quenching, deformation heat treatment, multi-stage subzero treatment, pulsed magnetic field assisted tempering, gradient surface hardening and nano-precipitation regulation treatment, the hardness and toughness of the die steel are remarkably improved. Particularly, through the synergistic effect of multiple advanced heat treatment means, the martensite structure is effectively refined, carbide precipitation is strengthened, the surface hardness and the core toughness are improved, the comprehensive performance of toughness and toughness is achieved, and the method is suitable for the field of high-performance injection molds and hot-working molds.

The invention discloses a high-Fe-content and high-comprehensive-performance aluminum alloy and a preparation method thereof.The specific method comprises the following steps that firstly, reasonable smelting and refining processes are adopted, three different modifiers are added to conduct Fe phase modification treatment on waste aluminum materials, and the existence form of the Fe element is controlled; and carrying out homogenization heat treatment and deformation heat treatment to obtain the high-temperature-resistant alloy. Through alloy component design and machining process optimization, the characteristics of morphology, distribution and the like of the Fe-rich phase are changed, phase change of the Fe-containing phase is achieved, the interface behavior of the Fe-containing phase is regulated and controlled, then accurate control over the microstructure of the high-Fe-content aluminum alloy is achieved, and high comprehensive performance is obtained. The high-Fe-content 6XXX series aluminum alloy prepared through the method has excellent mechanical performance and corrosion resistance, the application requirement of the high-quality 6XXX series aluminum alloy can be met, and a new way is provided for high-value utilization of secondary aluminum.

The invention discloses an ultrahigh-strength Al-Mg-Si-Cu alloy and a thermomechanical treatment method thereof. The alloy comprises the following components in percentage by mass: 1.2 to 2.0 percent of Mg, 1.0 to 1.5 percent of Si, 0.5 to 1.5 percent of Cu, 0.15 to 0.5 percent of Zn, 0.2 to 0.4 percent of Mn, 0.05 to 0.1 percent of Ti, 0 to 0.5 percent of Fe and the balance of Al and inevitable impurities. The density of a strengthening phase in the structure of the alloy is greater than or equal to 7.18 * 10 < 22 > / m < 3 >; the specific heat treatment comprises the following steps of (1) solid solution quenching, (2) under-aging treatment, (3) pre-deformation and (4) aging treatment, and based on the composite strengthening effect of precipitation strengthening and dislocation strengthening, the aluminum alloy plate obtains higher strength on the premise that good shaping is guaranteed; meanwhile, the time of peak aging heat treatment is shortened, and the production efficiency is improved.

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 invention provides an aluminum alloy ring or barrel part ring rolling manufacturing process based on shear strain superposition. The aluminum alloy ring or barrel part ring rolling manufacturing process specifically comprises the following steps that an aluminum alloy ring or barrel part is preheated; the outer side of the aluminum alloy ring or cylinder piece is heated, the inner side of the aluminum alloy ring or cylinder piece is cooled, and a temperature difference is formed between the outer side and the inner side of the ring or cylinder piece; a driving roller and a core roller are synchronously preheated according to the temperature of the outer side and the inner side of the ring or the cylinder part, and the driving roller and the core roller make contact with and are tangent to the outer side and the inner side of the ring or the cylinder part respectively; setting the linear speeds of the core roller and the driving roller, and ensuring that the linear speed ratio of the driving roller to the core roller is greater than 1; and carrying out thermomechanical treatment on the aluminum alloy ring or cylinder piece. According to the aluminum alloy ring or barrel part ring rolling manufacturing process based on shear strain superposition, the shear strain can be fully utilized in the aluminum alloy ring rolling process, so that the organization structure of the ring or barrel part is greatly improved, and high-strength and high-toughness aluminum alloy ring or barrel part ring rolling manufacturing is achieved.

The invention discloses a composite preparation process of a high-strength aluminum alloy special-shaped ring forge piece, and belongs to the technical field of metal plastic processing and heat treatment. The technology sequentially comprises the steps of multidirectional isothermal forging cogging, intermediate solution treatment, special-shaped preformed blank near-net forming, pulse current auxiliary special-shaped ring rolling and deformation heat treatment. Intermediate solution treatment is introduced to interrupt tissue inheritance, and a uniform fine-grain matrix is obtained; by means of the electroplastic effect of pulse current, efficient near-net forming of the special-shaped section is achieved at the low temperature, and grains are further refined; and finally, through combination of pre-cooling deformation and aging deformation heat treatment, synergistic improvement of strength and toughness is achieved. According to the method, the technical problems that in the preparation process of the high-strength aluminum alloy special-shaped ring forge piece, the structure is uneven, the performance anisotropy is high, special-shaped forming is difficult, and the material utilization rate is low are effectively solved, and a near-net-shape product with excellent comprehensive performance and high size precision can be stably obtained.

The invention relates to the technical field of heat treatment of large-diameter thick-wall forged pipes, in particular to an ultrahigh-strength and high-toughness heat treatment method for a large-diameter thick-wall forged pipe. The heat treatment process comprises the steps that S1, surface blowing cooling is immediately conducted after forging forming, heating and heat preservation are conducted after cooling, then discharging and air cooling are conducted, and heating and heat preservation are conducted twice; s2, after the pipe fitting is subjected to heating and heat preservation treatment for four times, normalizing treatment, heating and heat preservation are conducted, and then fine grain forging is conducted to improve the grain size; and finally, annealing treatment is performed. S3, after the pipe fitting is subjected to structure refining deformation heat treatment, austenitizing treatment is carried out, then quenching treatment is carried out, and tempering treatment is carried out twice; and S4, after the pipe fitting is subjected to one-time heat treatment, short-time austenitizing treatment is conducted, then quenching is conducted, and tempering treatment is conducted twice. In the aspect of mechanical properties, the yield strength is larger than or equal to 1600 MPa, the tensile strength is larger than or equal to 1800 MPa, the ductility is larger than or equal to 12.0%, the Rockwell hardness is larger than or equal to 51.0 HRC, the impact toughness Akv is larger than or equal to 60.0 J, and the-40 DEG C low-temperature impact toughness Akv is larger than or equal to 30.0 J.

The application relates to a copper target material deformation heat treatment process suitable for continuous production, characterized in that copper plates are continuously put into a -50 DEG C low-temperature holding box in sequence, the copper plates are quickly sent into a rolling mill for deep low-temperature rolling after the temperature of the copper plates is reduced to -50 DEG C, the above-mentioned temperature reduction and rolling multi-pass processes are repeated, and the total deformation of the copper plates reaches 80%; the application is suitable for industrialized continuous and rapid production, high production efficiency is obtained, the obtained target material has good uniformity and good fine-grain effect; through composite deformation, grains are broken, and then a targeted annealing process is formulated to make high-purity copper recrystallize, eliminate shear bands and coarse grains in a single deformation such as rolling, the process cost is moderate, a complex mold is not needed, and the process is a good high-purity copper target material fine-grain and structure optimization process scheme.

The invention relates to the technical field of metal product processing, and particularly discloses a manufacturing and production process of a laminated composite efficient stirring component. The component is prepared from a duplex stainless steel strip as a raw material through the procedures of pretreatment, stamping, stretching, bending, heat treatment, surface treatment and the like. The preparation method comprises the following steps: carrying out electrolytic polishing on a strip, and directly carrying out low-temperature plasma nitriding without cleaning; strip-shaped wires and connecting parts are punched through a multi-station progressive die, and the strip-shaped wires and the connecting parts are bent into a cage body after being gradually stretched through a plurality of groups of roller dies; and then carrying out thermomechanical treatment, carrying out direct ion implantation after micro-arc oxidation, then carrying out subzero treatment, and finally carrying out chemical nickel plating and low-temperature curing. The member can be used for industrial stirring operation and has the advantages of being good in surface quality, high in structural precision and stable in mechanical property; in addition, the preparation method disclosed by the invention has the advantages of high working procedure collaboration, capability of effectively improving the comprehensive performance of the component and coherent and controllable process.

The invention relates to a thermomechanical treatment method for improving the mechanical property of an aluminum-lithium alloy special-shaped transition cabin section, in the method, in the forging cogging stage, an isothermal low-speed deformation mode is adopted for multidirectional forging cogging, casting defects are eliminated, and a coarse crystal phase and a grain structure are refined; in the forming stage, high-temperature isothermal forming is adopted for restraining recrystallized grain growth, and meanwhile the forming load can be reduced; in-mold local cold compression is adopted after solid solution heat treatment, uniform cold deformation can be obtained through local cold compression, quenching residual stress can be reduced, and strengthened compact precipitation can be promoted. Therefore, through cooperation and regulation and control of a full-process deformation treatment process, a coarse crystal phase can be fully refined, a uniform and fine grain structure and a compact precipitation strengthening phase are obtained, and therefore the high-performance complex special-shaped transition cabin section is developed.

The invention provides an on-line combined manufacturing method and system for a green flexible seamless steel pipe, and the method comprises the following steps: a hot rolling sizing step: obtaining a hot-rolled steel pipe; an on-line temperature equalizing step: uniformly heating the steel pipe by using a stepping soaking pit furnace; an on-line cooling step: executing the tissue regulation and control of the final cooling temperature or the on-line quenching of the final cooling temperature through the multifunctional quenching machine tool; and an online heat treatment step: carrying out tempering and normalizing treatment on the steel pipe by utilizing a multifunctional heat treatment furnace which is arranged on line. The system correspondingly comprises a hot rolling unit, an online soaking pit furnace, a multifunctional quenching machine tool and a multifunctional heat treatment furnace which are sequentially arranged. Through systematic integration of the process and equipment, rolling waste heat is fully utilized for tissue regulation and heat treatment, and energy is saved by 35%-40%; the uniform-temperature furnace guarantees the performance stability of the product, and the impact energy after online deformation heat treatment can be improved by about 20%; and timely tempering is carried out after online quenching, so that the cracking risk of the steel pipe is thoroughly eliminated, and efficient, high-quality and flexible seamless steel pipe production is realized.

The application relates to the technical field of non-ferrous metal material processing, in particular to a high-strength and high-conductivity copper alloy containing boron and a cryogenic deformation heat treatment method thereof. The cryogenic deformation heat treatment method comprises the following steps: vacuum melting and casting and composite purification, homogenization treatment, hot rolling and quenching, three-stage cryogenic plastic deformation treatment, multi-stage cold rolling and grading aging treatment. The application adopts the process of vacuum melting and casting and composite purification, avoids oxidation by adopting vacuum melting and casting, carries out composite purification by combining ultrasonic vibration and electromagnetic stirring, refines melt grains by ultrasonic vibration, promotes FeB phase dispersion precipitation by electromagnetic stirring, and solves the problem of uneven distribution of impurities in traditional melting and casting.

The invention relates to the technical field of metal material thermomechanical treatment, and particularly discloses a thermomechanical treatment method for improving the corrosion performance of Zr-containing high-strength aluminum alloy, which is technically characterized by comprising the following steps: firstly, carrying out low-speed heating two-stage thermomechanical treatment on a spray-formed 7055 aluminum alloy extruded plate; the specific process comprises the following steps: heating from room temperature to 450 DEG C at the speed of 140 DEG C / h, preserving heat for 3 hours, then heating to 475 DEG C at the speed of 50 DEG C / h, preserving heat for 3 hours, and carrying out water quenching; then carrying out hot rolling under the condition of 400 DEG C / 1s <-1 > to obtain a rolled plate, and carrying out solution treatment on the rolled plate at 470 DEG C / 2h; and carrying out 440 DEG C / 0.5-2 h high-temperature pre-aging treatment and 120 DEG C / 24 h peak aging treatment. The method provides a thermomechanical treatment system which enables the alloy to have high strength and excellent corrosion resistance and is suitable for industrial thick plates; the system shows better effects in the aspects of micron-scale second phase redissolution and distribution uniformity, precipitation of nano-scale Al3Zr particles and improvement of alloy grain structure uniformity.

The invention discloses a high-copper-content aluminum-silicon alloy and a thermomechanical treatment method thereof. The high-copper-content aluminum-silicon alloy comprises the following components in percentage by weight: 6.8 to 7.2 percent of Si, 2.8 to 3.2 percent of Cu, 0.45 to 0.55 percent of Mg, 0.02 to 0.04 percent of Sr, 0.02 to 0.04 percent of Ti, less than 0.15 percent of Fe and the balance of Al and inevitable impurities. The thermomechanical treatment method of solution treatment, friction stir treatment and aging treatment is adopted, the contradiction problem of second-phase overburning and eutectic silicon refining and spheroidizing of the high-copper-content aluminum-silicon alloy under the condition of a traditional heat treatment process is solved, synergistic improvement of the obdurability of the high-copper-content aluminum-silicon alloy is achieved, and the structure defects are remarkably reduced.

The invention relates to the technical field of advanced steel and iron material heat treatment, and discloses a deformation heat treatment device of a super austenitic stainless steel forging.The deformation heat treatment device comprises a machine body, a conveying part and a clamping part, the conveying part is arranged in the machine body, the clamping part is arranged on a conveying roller, a plurality of fixed pillow blocks are arranged in the machine body, and a mounting frame is arranged in the machine body; a medium-frequency induction heating power supply is arranged in the mounting frame, and an induction heating coil is connected to the medium-frequency induction heating power supply. The forward speed and rotation of the round blank in the induction heating coil are accurately controlled through the conveying part and the clamping part, so that the uniformity of circumferential and longitudinal heating of the round blank is ensured, local overburning or insufficient heating is avoided, the problem of circumferential temperature difference of the blank possibly caused by uneven magnetic field distribution of the induction coil is effectively solved, and the production efficiency is improved. The blank is periodically rotated, so that the whole circumferential surface of the blank can be uniformly exposed in the strongest induced magnetic field, and a foundation is laid for subsequent uniform deformation.

This invention discloses a deformation heat treatment process for CoCrMo alloys, belonging to the field of non-ferrous metal processing technology. The process includes heating the CoCrMo alloy billet to 1200-1250℃ and holding it at that temperature; rolling the held CoCrMo alloy in multiple passes, with the initial and final rolling temperatures for each pass being 1150-1200℃; between adjacent rolling passes, the alloy is returned to a holding furnace at the initial rolling temperature for holding; after rolling, the alloy is water-cooled to room temperature; and the rolled CoCrMo alloy is heated to 450-600℃ for tempering, held at that temperature, and then furnace-cooled to room temperature to obtain the finished product. This invention solves the problems of easy cracking, complex processing, and poor finished product performance of CoCrMo alloys by eliminating the σ phase through homogenization treatment, precise temperature-controlled continuous rolling, water cooling to suppress secondary precipitation of the σ phase, and stress relief and microstructure optimization through tempering. The resulting alloy has no σ phase residue, fine grains, and good strength-toughness matching, making it suitable for processing high-performance CoCrMo alloy products in the medical, aerospace, and petrochemical industries.

The invention provides a novel multistage heterostructure eutectic high-entropy alloy and a preparation method, and relates to the field of high-performance metal materials. Comprising the following steps: selecting metal simple substances of Al, Co, Cr, Fe, Ni, Ti, Mn and Mo according to the atomic ratio of (16-17): (27-29): (13-15): (13-15): (24-26): (0-2): (0-3): (0-2), polishing the surfaces of the metal simple substances, cleaning, drying, putting the metal simple substances into a smelting furnace, repeatedly smelting for 3-5 times to obtain an alloy liquid, pouring the alloy liquid into a mold, pouring, cooling along with the furnace to obtain an as-cast eutectic high-entropy alloy block, heating to 800-1200 DEG C, and carrying out heat treatment on the alloy block to obtain the eutectic high-entropy alloy block. And the eutectic high-entropy alloy is subjected to cutting and cold rolling deformation, heat preservation is conducted for 1 h at the temperature of 650-790 DEG C, then water cooling is conducted, and the novel multilevel heterostructure eutectic high-entropy alloy is obtained. The microelement-doped eutectic high-entropy alloy is designed through thermodynamic parameter calculation and phase diagram calculation, the structure of the eutectic high-entropy alloy is regulated and controlled through thermomechanical treatment, a multi-stage heterostructure is constructed, and the obdurability of the alloy material is improved.

The invention discloses a preparation method of low-carbon martensitic steel with optimized structure and performance. The preparation method comprises the following steps: step 1, burdening; step 2, impurity removal; step 3, smelting; step 4, heating and forging; step 5, pretreatment; step 6, thermomechanical treatment; step 7, quenching; step 8, tempering; step 9, performing post-treatment; according to the method, the grain structure of the internal structure of the rigid body is refined through thermomechanical treatment, and the performance of the quenched martensitic structure is optimized; rare earth elements are added in ingredients, the interface energy between a solid phase and a liquid phase is improved, the corrosion resistance and the fatigue performance of the steel are improved, and the hydrogen embrittlement sensitivity is reduced. Impurities and oxide layers on the surfaces of the steel ingots are removed before heat treatment, so that the preparation purity is improved, and the preparation difficulty of the low-carbon martensitic steel is reduced; a second phase structure is added into a low-carbon matrix and is separated out in a fine particle form in the matrix, dislocation movement is hindered, and therefore the strength of the prepared steel is enhanced.

The invention discloses a copper-based composite material based on oxide dispersion strengthening and a preparation method. The preparation method comprises the following steps: respectively pretreating Al powder and Cu powder; the pretreated Al powder, the pretreated Cu powder, the pretreated Cr powder, the pretreated Fe powder, the pretreated Mn powder, the pretreated Ti powder and the pretreated Y powder are subjected to ball milling, meanwhile, ZrO2 nanoparticles are introduced to serve as additional dispersed phases, and copper-based supersaturated solid solution-nanometer Al2O3 / ZrO2 composite powder is obtained after ball milling; sintering the composite powder to obtain an SPS blank; and the SPS blank is subjected to multi-stage deformation heat treatment, and the copper-based composite material is obtained. According to the preparation method, the supersaturated solid solution, the in-situ generated nano oxide and the external aid nano oxide are combined in the copper matrix through mechanical alloying, and then the microstructure is precisely regulated and controlled through SPS and multi-stage deformation heat treatment; and the comprehensive properties such as high strength, high hardness, excellent electric conductivity and thermal conductivity, good high-temperature stability and the like can be improved.

This application discloses a synchronous extrusion forming method for improving the fatigue performance of thin-walled, fine-hole shaft components, belonging to the field of high-temperature alloy precision plastic forming technology. The method includes: preheating a steel mandrel and an alloy hollow billet with a pre-set central hole; synchronous extrusion forming: fixing the preheated alloy hollow billet, pushing the preheated steel mandrel axially into the central pre-hole of the alloy hollow billet, and driving the alloy hollow billet to undergo radial compression deformation, so that the extrusion process of the steel mandrel and the extrusion deformation process of the alloy hollow billet are completed integrally; after forming, separating the steel mandrel from the alloy hollow billet, and subjecting the alloy hollow billet to subsequent heat treatment and processing. In this application, the synchronously extruded steel mandrel and the flowing inner wall of the alloy hollow billet generate intense relative motion and frictional shearing, allowing the core region, which is most difficult to deform in traditional processes, to bear the maximum degree of shear strain and deformation heat treatment effect, resulting in ultra-fine grains.

The invention discloses a high-toughness corrosion-resistant Ti-Cr-Al-Nb-Mo series multi-principal element alloy as well as a preparation method and application of the high-toughness corrosion-resistant Ti-Cr-Al-Nb-Mo series multi-principal element alloy. The invention relates to a high-toughness corrosion-resistant Ti-Cr-Al-Nb-Mo series multi-principal element alloy, which comprises the following components in percentage by atom: 54.5 to 72.0 percent of Ti, 7 to 19 percent of Nb, 10.0 to 13.5 percent of Cr, 6 to 9 percent of Al, 0.5 to 1.5 percent of Mo, 0 to 1.5 percent of Zr and 0 to 1.0 percent of Si. According to the alloy provided by the invention, based on a multi-principal-element alloy design thought, the titanium-rich multi-principal-element alloy with a single-phase BCC structure and uniform components is prepared through a component regulation and control and deformation heat treatment process, and the alloy has the advantages of light weight, high toughness and corrosion resistance. The preparation method and the process flow are simple, so that the preparation method has a good application prospect.

The invention relates to a high-performance copper alloy dynamic forming process, which selects and optimizes basic components of a copper alloy, including but not limited to copper, zinc, nickel, tin, aluminum, silicon and trace rare earth elements, and predicts and determines the optimal proportion of each element through an algorithm so as to improve the mechanical property, corrosion resistance and processability of the copper alloy. And inert gas protection is combined, the smelting temperature and time are controlled, it is ensured that alloy components are evenly distributed, then casting is conducted, and the defect-free copper alloy blank with the even structure is obtained. In the alloy smelting and casting process, the vacuum induction smelting technology is combined with inert gas protection, oxidation and inclusion generation in the smelting process are effectively controlled, uniform distribution of alloy components and high quality of a blank are ensured, the purity and the structure uniformity of the alloy are improved, and the production cost is reduced. And a solid foundation is laid for subsequent dynamic recrystallization and deformation heat treatment.

The application discloses a Mg-Gd-Y high rare earth element content magnesium alloy with high room temperature and high temperature strength and a preparation method of the alloy plate. The alloy composition comprises the following components in a mass fraction: Gd: 8-12%, Y: 1-3%, Zr: 0.01-0.5%, Ag: 0.01-0.5%, Nd: 0.01-0.5%, and the total mass fraction of rare earth elements is greater than or equal to 10%; impurity elements Al is less than or equal to 0.01%, Fe is less than or equal to 0.04%, Mn is less than or equal to 0.02%, and the total content of impurity elements is less than or equal to 0.1%, and the rest is Mg; the preparation method comprises alloy smelting and deformation heat treatment. The room temperature tensile strength of the alloy plate prepared by the application can be more than 450 MPa, the elongation rate can be more than 5.0%, the tensile strength at 300 DEG C can be more than 200 MPa, and the elongation rate can be more than 20%, and the comprehensive performance is obviously better than that of general magnesium alloy materials.

The application discloses a manganese white copper material for precision resistance and a preparation method thereof. The material is composed of 15-20 wt% of Ni element, 18-25 wt% of Mn element, 1.0-2.0 wt% of Sn element, 0.2-1.0 wt% of Ti element, 1.5-2.5 wt% of Ag element and the rest of Cu plus inevitable impurities, wherein the mass ratio of Mn to Ni is greater than 1.2. The application reduces the resistance temperature coefficient of the alloy by adding micro-alloy elements such as Sn, Ti and Ag and introducing low-resistance NiMn phase particles; and the uniformity of the microstructure of the manganese white copper finished product is further improved and the performance stability of the alloy finished product is improved by adopting a vacuum horizontal continuous casting technology and a deformation heat treatment process optimization and the like.

The invention discloses a thermomechanical treatment method of a copper-chromium-zirconium alloy strip, which comprises the following steps: weighing casting raw materials according to a preset ratio range, and putting the casting raw materials into a smelting furnace for smelting and casting to obtain a cast ingot, the casting raw materials comprising a Cu raw material, a Cr raw material, a Zr raw material and impurities; carrying out heating treatment and hot rolling treatment on the cast ingot to obtain a hot-rolled blank, and carrying out primary solid solution treatment on the hot-rolled blank to obtain a primary solid solution blank; primary cold rolling treatment is carried out on the primary solid solution blank, intermediate heat treatment is carried out on a primary cold-rolled strip, secondary solid solution treatment is carried out on an intermediate strip, and a secondary solid solution blank is obtained; secondary cold rolling treatment is conducted on the secondary solid solution blank, and a secondary cold-rolled strip is obtained; and the secondary cold-rolled strip is subjected to aging treatment, and the copper-chromium-zirconium alloy strip is obtained. By designing the combination of multi-stage solid solution and specific intermediate heat treatment, a precipitated phase is induced to be precipitated in a finer and more dispersed form in the cold rolling process, and the strength and conductivity of the alloy are improved.

The invention discloses a high-strength corrosion-resistant aluminum-lithium alloy and a preparation method thereof, and relates to the technical field of aluminum-lithium alloys, and the alloy comprises the following element components in percentage by weight: 1.8%-2.2% of Li, 2.8%-3.2% of Cu, 4.2%-4.6% of Mg, 0.15%-0.25% of Ag, 0.08%-0.15% of Sc, 0.06%-0.10% of Zr, 0.03%-0.05% of Y, less than or equal to 0.05% of Fe, less than or equal to 0.03% of Si and the balance of Al. The preparation method of the aluminum-lithium alloy comprises the steps of smelting, gradient cooling casting, homogenization treatment, controlled deformation heat treatment, composite aging strengthening and the like. Through collaborative optimization of the components and the process, the contradiction among mechanical strength, toughness and corrosion resistance of a traditional aluminum-lithium alloy is broken through, and a solution is provided for a high-end light-weight structural material.

The invention belongs to the technical field of metal materials, and particularly discloses high-toughness and easy-to-form medium manganese steel and a preparation method thereof. The preparation method adopts a staged thermomechanical treatment process: firstly, preliminary thermomechanical treatment (warm rolling and low-temperature tempering) is carried out, at the moment, the yield strength and Vickers hardness of the material are low, and the material is easy to machine and form; and then the formed workpiece is subjected to subzero treatment and low-temperature tempering, so that the final strength of the workpiece is improved. Through the unique process route of warm rolling, low-temperature tempering (pre-stabilization), machining forming, subzero treatment and final tempering, high strength and toughness and formability which are mutually contradictory traditionally are successfully decoupled in time sequence, and the technical problems that in the machining process of the medium manganese steel, forming is difficult if the strength is high, and the strength is low if the medium manganese steel is easy to form are solved; the yield strength of the prepared medium manganese steel is larger than 1800 MPa, the tensile strength is larger than 2000 MPa, and the percentage elongation after fracture is larger than 24%.

The invention discloses a thermomechanical treatment method for improving the corrosion resistance of magnesium-aluminum alloy, and relates to the technical field of magnesium alloy heat treatment. The thermomechanical treatment method comprises the following steps: S1, carrying out solution treatment on the magnesium-aluminum alloy, and then quenching; s2, the magnesium-aluminum alloy subjected to solution treatment is subjected to pre-deformation treatment; s3, the magnesium-aluminum alloy subjected to pre-deformation treatment is subjected to subzero treatment; and S4, the magnesium-aluminum alloy subjected to subzero treatment is subjected to artificial aging treatment. According to the method, the synergistic effect of pre-deformation and subzero treatment of the magnesium-aluminum alloy is utilized, twinning deformation is induced, dislocation proliferation is promoted, cold-induced compressive stress is introduced, growth of a precipitated phase in the subsequent aging process of the magnesium-aluminum alloy is effectively controlled, residual stress is reduced, on the premise that the mechanical property is guaranteed, the corrosion resistance of the magnesium-aluminum alloy is remarkably improved, and the service life of the magnesium-aluminum alloy is prolonged. And guarantee is provided for safe service of products. The method is simple, economical, feasible and suitable for industrial production, and the application prospect of the magnesium alloy is widened.