26results about How to "Promote recrystallization" patented technology

The invention discloses a heat treatment method for improving the mechanical property of a GH4099 high-temperature alloy, which comprises the following steps: firstly, printing a GH4099 alloy material into a part by adopting an additive manufacturing method, and then sequentially carrying out annealing treatment, hot isostatic pressing treatment, solution treatment and aging treatment on the part to obtain a final part, annealing treatment, hot isostatic pressing treatment (HIP), solution treatment and aging treatment are sequentially conducted on the GH4099 alloy subjected to 3D printing, the defects and texture problems generated by printing are eliminated through hot isostatic pressing treatment, and then the mechanical property of the GH4099 alloy is further improved through solution treatment and aging treatment.

The invention discloses a non-quenched and tempered hot-rolled seamless square tube and a preparation method thereof, and belongs to the field of metallurgical metal. The steel comprises, by weight, 0.10%-0.25% of C, 0.15%-0.50% of Si, 1.15%-1.70% of Mn, 0.05%-0.15% of V, 0.01%-0.06% of Nb, 0.015%-0.06% of Al, 0.10%-0.50% of Cr, 0.10%-0.30% of Ni, smaller than or equal to 0.020% of P, smaller than or equal to 0.010% of S, smaller than or equal to 0.00070% of B, 0.0060%-0.020% of N, larger than or equal to 12.5% (Nb + V + Al), smaller than or equal to 13.5% of N and the balance Fe and inevitable impurities. The non-quenched and tempered seamless square tube prepared by the method has relatively high obdurability and relatively high hot rolling process precision.

The invention provides a tin plate wide steel strip and a preparation method thereof, and relates to the technical field of steel production, the method comprises the following steps: carrying out heat treatment on a continuous casting billet, and then carrying out hot continuous rolling treatment to obtain an initial steel strip; wherein the rolling reduction of the continuous casting billet in the rough rolling treatment process accounts for more than 75% of the total rolling reduction of the continuous casting billet; 6 passes of rough rolling and 7 passes of finish rolling are carried out in the rough rolling treatment process, the single-pass reduction rate of the first 3 passes of rough rolling is 17% or above, the single-pass reduction rate of the last 3 passes of rough rolling is 27% or above, and the single-pass reduction rate of the first 4 passes of finish rolling is 30% or above; the initial steel strip is subjected to laminar cooling to the coiling temperature and then is coiled, and the wide steel strip of the tin-plated plate is obtained; wherein the laminar cooling speed is 10 DEG C / s or above, and the coiling temperature ranges from 560 DEG C to 600 DEG C. The wide steel strip of the tin-plated plate prepared by the method disclosed by the invention is relatively uniform in structure and mechanical property, and the steel strip is not easy to deviate in the cold rolling process.

The invention discloses an aluminum-scandium alloy and a preparation method and application thereof, and belongs to the technical field of rare earth alloy sputtering target materials, metal aluminum particles and metal scandium particles are used as raw materials, high vacuum is extracted, inert gas is introduced for multiple times of electric arc melting, aluminum-scandium alloy melt with uniform components is obtained, and after the aluminum-scandium alloy melt is cooled, the aluminum-scandium alloy is obtained. The method comprises the following steps: preparing an aluminum-scandium alloy ingot, carrying out induction heating on the aluminum-scandium alloy ingot prepared by electric arc melting to completely melt the alloy so as to obtain an alloy melt, guiding the alloy melt to be injected into a mold through an argon pressure difference, naturally cooling to form a primary alloy, and carrying out homogenizing annealing on the primary alloy under a vacuum condition to obtain the aluminum-scandium alloy. And eliminating the residual internal stress of the primary alloy to obtain the aluminum-scandium alloy. The aluminum-scandium alloy prepared through the method is low in oxygen content, high in density, fine in crystal grain, uniform in structure and good in machining performance.

The invention relates to the technical field of slag filling materials, in particular to a method for analyzing the influence of the addition amount of fly ash on the early strength of a sulphoaluminate-based grouting material and the fly ash-sulphoaluminate cement grouting material. The method comprises the following steps: detecting particle size distribution parameters of fly ash and sulphoaluminate cement; grouting liquid with different proportions is prepared and cured to form a filling body; carrying out uniaxial compression resistance test, XRD phase test, TG thermal analysis, SEM test and MIP pore test on the prepared filling body; according to the method, the strength development, hydration product formation and microstructure evolution of the grouting material under different conditions are comprehensively analyzed, the change of the hydration strength can be effectively controlled by controlling the content of the fly ash, and the strength damage phenomenon caused by high-content fly ash is avoided; the mechanical property and the stability of the filling body are improved, and the safety and the durability of engineering are ensured.

The invention discloses a preparation method of a graphene reinforced metal-based composite material and a wire, and belongs to the technical field of material preparation. According to the preparation method, the graphene powder and the metal powder are effectively mixed, so that the problems that graphene agglomerates and metal is not easily dispersed are solved, and then the graphene metal composite powder is subjected to continuous extrusion treatment; the continuous powder metallurgy forming process of pure metal powder and graphene metal composite powder can be achieved by regulating and controlling the extrusion technology, tight combination between metal and metal powder and tight combination between metal powder and graphene are achieved, and therefore the potential of high strength and high electric conduction and heat conduction of graphene is effectively exerted. And the comprehensive improvement of the mechanical property and the electric conduction and heat conduction properties of the graphene reinforced metal-based composite material is realized.

The invention provides a preparation method of a high-strength and high-plasticity Ti-15Zr alloy wire, which comprises the following steps: (1) weighing, mixing, pressing, welding and vacuum consumable smelting to obtain a cast ingot blank; (2) carrying out cogging forging and continuous rolling to obtain a wire blank; (3) heating to the alpha + beta two-phase region temperature for primary rounding and air cooling, cooling to the alpha-phase region temperature for secondary rounding, then heating to the alpha + beta two-phase region temperature for tertiary rounding and peeling to obtain a wire; and (4) multi-pass cold drawing and high-temperature short-time annealing are conducted, and the Ti-15Zr alloy wire is obtained. The invention further provides the high-strength and high-plasticity Ti-15Zr alloy wire, and the high-strength and high-plasticity Ti-15Zr alloy wire is prepared according to the preparation method of the high-strength and high-plasticity Ti-15Zr alloy wire. The machining process is simple, the production cost is low, the production efficiency is high, the performance of the titanium-zirconium alloy wire is good, and matching of high strength and good plasticity of the titanium-zirconium alloy wire in the cold machining process is achieved; belongs to the technical field of titanium-zirconium alloy wire preparation.

The invention discloses a method for optimizing parameters for a steel pipe expanding process by using a thermal simulation experiment technology. The method comprises the following steps: S1, sample preparation: cutting out a plurality of cylindrical thermal simulation samples from a target steel pipe; s2, designing a scheme, namely setting a plurality of groups of process parameter combinations including a heating temperature T, a heat preservation time t, a deformation rate epsilon 1 and a deformation epsilon 2; s3, performing thermal compression experiments: performing multiple groups of thermal compression experiments on the sample on a thermal simulation experiment machine according to the parameter combination; s4, structure analysis: analyzing the metallographic structure of the test sample after the experiment, and determining process parameters corresponding to the test sample which is completely recrystallized and has refined grains; and S5, window determination: based on an analysis result of S4, determining an optimal process parameter window for enabling the steel pipe to be subjected to complete recrystallization and grain refinement. The invention further discloses a diameter expanding method. The purpose of the invention is to realize accurate control of the expanding process by combining a thermal simulation experiment with industrial production.

The application provides a biaxial texture nickel oxide buffer layer and a preparation method and application thereof, and relates to the technical field of coated conductor preparation.The preparation method of the biaxial texture nickel oxide buffer layer provided by the application comprises the following steps: performing recrystallization annealing treatment on a nickel alloy in a reducing atmosphere to obtain a biaxial texture nickel alloy; and performing oxidation treatment on the biaxial texture nickel alloy in an oxidizing atmosphere to obtain the biaxial texture nickel oxide buffer layer.The biaxial texture nickel oxide buffer layer is prepared by using a controllable oxidation recrystallization texture method, the prepared biaxial texture nickel oxide buffer layer has good c-axis orientation, low surface roughness, and good in-plane and out-of-plane growth texture.The preparation process is simple, the operation control is simple, the cost is low, the application is environment-friendly, and the application is suitable for large-scale application.

The invention discloses a processing method for controlling precipitation of an Al-Mg-Si-Mn-containing phase and a grain structure and application of the processing method, and belongs to the technical field of metal material processing. The processing method comprises the following steps: S1, smelting and casting to obtain an Al-Mg-Si-Mn alloy cast ingot; s2, carrying out secondary homogenization treatment on the cast ingot; s3, after homogenization, quickly transferring to a cooling area; s4, cooling the cast ingot in a cooling area, wherein the cooling is secondary cooling; s5, the cast ingot is heated, and heating is second-stage heating; s6, the heated casting rod is extruded, and the on-line cooling rate of the profile is controlled; and S7, cooling to obtain a profile product. According to the method, a grain structure of a specific sandwich structure is obtained, fiber-state grains are reserved in the structure to the maximum extent, and the strength performance of the 6-series alloy can be improved. The method is wide in application and can be applied to machining of 6110, 6110A, 6013, 6056 and other high-strength 6-series alloy profiles.

The invention provides a low-resistance temperature coefficient precision resistance alloy and a preparation method thereof. The alloy comprises the following components: less than or equal to 0.04% of C, 1.30%-1.50% of Si, 0.30%-0.55% of Mn, less than or equal to 0.010% of S, less than or equal to 0.010% of P, 19.70%-20.50% of Cr, 3.40%-3.70% of Al, 0.60%-1.0% of Fe and the balance of Ni and inevitable impurities. The alloy has a low resistance temperature coefficient and is widely applied to the fields of aviation, aerospace and high-end instruments and meters. The manufacturing method comprises the steps that smelting is conducted in a vacuum induction furnace, a steel ingot is obtained through casting and vacuum consumable remelting, and then heating, forging and heat treatment are conducted on the steel ingot. In the smelting process, the alloy components are ensured to be accurate by controlling the pressure in the furnace, the oxygen and nitrogen content and the smelting time. And during forging, the temperature is slowly increased to 1050-1060 DEG C, heat preservation is conducted for 2-3 hours, and finally forging is conducted to the needed form. And finally, carrying out heat treatment to improve the mechanical property and the resistance temperature coefficient stability of the material. The manufacturing method can effectively improve the alloy performance, is suitable for production of precision resistor elements, and has a wide market prospect.

This invention belongs to the field of metallurgical technology, and particularly relates to a 420MPa grade galvanized low-alloy high-strength steel and its production method. The steel composition by mass percentage is as follows: C: 0.06%~0.08%, Si: 0.05%~0.08%, Mn: 0.95%~1.15%, P≤0.025%, S≤0.010%, Al: 0.015%~0.060%, O≤0.0060%, N≤0.0060%, V: 0.01%~0.03%, Ti: 0.01%~0.03%, with the balance being Fe and unavoidable impurities. The advantages are: through V-Ti composite microalloying and controlled hot and cold rolling processes, synergistic effects of fine grain strengthening and precipitation strengthening are achieved. The ferrite grain size is 2~5μm, the (Ti,V)C precipitate size is 20~30nm, the steel plate yield strength is ≥420MPa, and the elongation is maintained above 20%.

The invention relates to the technical field of electronics, in particular to a Wiegand filament preparation process based on low-density current. The preparation process comprises the following steps: S1, uniformly mixing 14-16 parts of iron, 3-5 parts of cobalt and 1-5 parts of nickel alloy, putting 0.02-1 part of neodymium or dysprosium into a smelting furnace, uniformly mixing to obtain molten alloy liquid, refining the molten alloy liquid, pouring the molten alloy liquid into a mold, and cooling and solidifying to obtain an alloy sheet; s2, processing the alloy sheet into an alloy wire; s3, the alloy wire is subjected to annealing treatment under the nitrogen atmosphere; s4, when the temperature of the annealed wiegand filaments is reduced to 500 DEG C, applying low-density current to the annealed wiegand filaments, and repeating for 1-3 times; and S5, after the wiegand filaments are cooled, cutting the wiegand filaments into required lengths, and packaging the wiegand filaments. The invention provides a Wiegand filament preparation process based on low-density current, and aims to solve the problems that the stability is poor in a high-temperature environment, and current transmission and conductivity cannot meet the rapid signal transmission requirement in the related technology.

The invention provides a chemical polishing post-processing method of a cadmium sulfide thin film, the cadmium sulfide thin film and a device. The chemical polishing post-processing method comprises the following steps: preparing a cadmium sulfide film on the surface of a substrate or a device structure; the cadmium sulfide thin film is immersed in chemical polishing liquid for aftertreatment, and the chemical polishing liquid is configured to selectively dissolve loose particles on the surface of the cadmium sulfide thin film and promote local rearrangement and recrystallization of the cadmium sulfide thin film. The chemical polishing solution removes loose particles, reduces surface roughness, compensates sulfur vacancies and improves compactness and crystal orientation through a mechanism of'selective light dissolution + defect compensation + local recrystallization ', so that the CdS film obtains more excellent material quality. The method is suitable for any device structure containing the CdS thin film such as a solar cell, a photoelectric detector and a thin film transistor, and has the advantages of being high in universality, mild in process, adaptive to various deposition systems and the like.

The invention relates to a plasma thermal spraying-hot rolling in-situ forming system and method for a titanium alloy ultrahigh-temperature wear-resistant ceramic coating. The plasma thermal spraying-hot rolling in-situ forming system comprises a heating unit, a plasma thermal spraying unit and a hot rolling unit. The titanium alloy is conveyed to the plasma thermal spraying unit after being subjected to electromagnetic induction heating; the high-melting-point ceramic composite powder is subjected to plasma high-temperature melting and then sprayed to the high-temperature titanium alloy, a ceramic melting layer is formed, then the ceramic melting layer and the titanium alloy are conveyed to a hot rolling unit together, and in-situ film forming-forming-forming rolling is carried out. By the adoption of the plasma thermal spraying-hot rolling composite system, by means of the high-temperature efficiency of plasma, the high-stress forming advantage of a roller and the preheating and heat preservation characteristics of high-temperature titanium alloy, generation of a metallurgical layer between a ceramic coating and the titanium alloy can be effectively promoted, air holes in the coating are inhibited, thermal stress cracks in the coating are reduced, and the service life of the coating is prolonged. And therefore, the ultrahigh-temperature ceramic coating with high hardness and high interface bonding performance is obtained, and the ultrahigh-temperature extreme environment wear resistance of the titanium alloy is finally improved.

The invention discloses an impact-resistant and high-thermal-conductivity regenerated PET composite material and a preparation method thereof, which are used for solving the technical problem that the thermal conductivity and impact resistance of regenerated composite polyester need to be further improved in the prior art. The preparation method comprises the following steps: performing carbon dioxide recrystallization and micro-foaming on a regenerated composite polyester blank to obtain regenerated composite polyester, preparing a carbonization promoting agent, promoting the formation of a porous carbon material in the carbonization process of the regenerated polyester and sawdust, and performing self-assembly on the surface of a carbon oxide filler to obtain a modified chain extender and a hybrid organic chain segment. And the carbonization promoting agent is used as a nucleation site to promote recrystallization of the regenerated composite polyester green body, promote diffusion of fluid and form a uniform and fine bubble structure, in the combustion process, the carbonization promoting agent is decomposed to form a molten carbon layer, releases flame-retardant gas to promote foaming of the carbon layer, and cooperates with a carbon skeleton to prevent flame from spreading, so that the flame-retardant performance of the regenerated composite polyester green body is improved. Finally, the impact-resistant, heat-conducting and wear-resistant flame-retardant regenerated composite polyester is obtained.

This invention provides a composite steel plate comprising a base layer and a cladding layer on top of the base layer. The composite steel plate has a thickness of 60-120 mm, the cladding layer is made of stainless steel, the base layer is made of carbon steel, and the bond strength between the base layer and the cladding layer is above 500 MPa. The composite steel plate of this invention exhibits excellent tensile properties, low-temperature impact resistance, and interlayer bonding performance. This invention also provides a method for preparing the above-mentioned composite steel plate.

The invention discloses a welding method for improving joint strength. The welding method comprises the following steps that flash welding upsetting is conducted on a steel rail section and a transition material section; normalizing heat treatment is carried out; the transition material section and the frog steel are subjected to flash welding upsetting; and the fastening state is kept, and deformation treatment is conducted by applying reverse tension. According to the method, reverse tension is applied immediately after joint flash welding is finished to increase the micro-area deformation degree, recrystallization is promoted in the slow cooling process by fully utilizing welding waste heat, the machining strengthening effect of a welding seam and a heat affected zone can be further improved in the process, grains are refined, the joint strength is improved, meanwhile, the joint stress distribution state can be improved, and the welding quality is improved. And deformation is reduced.

The invention relates to a high-toughness ultrahigh-temperature ceramic-based composite material and a preparation method thereof. The method comprises the following steps: preparing a high-thermal-conductivity fiber preform; preparing an interface layer on the fiber surface of the high-thermal-conductivity fiber preform through a chemical vapor deposition method to obtain a porous carbon / carbon matrix; uniformly dispersing the boron nitride nanotubes in the hafnium-zirconium composite ceramic precursor solution through sanding and high-pressure homogeneous dispersion technologies to obtain a boron nitride nanotube reinforced hafnium-zirconium composite ceramic precursor solution; a boron nitride nanotube reinforced hafnium zirconium composite ceramic precursor solution reacts with a porous carbon / carbon matrix through a precursor impregnation and pyrolysis process, and the high-toughness ultrahigh-temperature ceramic matrix composite material is prepared. The high-toughness ultra-high-temperature ceramic matrix composite material prepared by the method comprises a hafnium zirconium carbon solid solution ceramic matrix and has the advantages of excellent mechanical property and ablation resistance and the like, the room-temperature mechanical property (room-temperature toughness) is remarkably improved, and the line ablation rate in an oxyacetylene ablation environment is remarkably reduced.

The invention discloses a low-performance-deviation aluminum foil blank and a preparation method thereof, and belongs to the technical field of aluminum alloy material processing. The aluminum foil disclosed by the invention is prepared from the following components in percentage by mass: 0.6%-0.75% of Fe, 0.45%-0.55% of Si, 0.04%-0.06% of Cu, 0.04%-0.06% of Zn, 0.01%-0.03% of Mn, 0.01%-0.03% of Cr, 0.01%-0.02% of Mg, 0.01%-0.03% of Ti and the balance of Al. The manufacturing method comprises the steps of burdening, smelting, cast rolling, primary cold rolling, homogenizing annealing, rough rolling and finish rolling. The content of Fe and Si in the aluminum foil is optimized, and the aluminum foil which is high in surface quality, good in plate shape, small in performance deviation in the transverse direction, the longitudinal direction and the 45-degree direction and excellent in comprehensive mechanical performance is obtained in combination with the sectional type homogenizing annealing and the hot rolling and cold rolling preparation technology.

The present application relates to a kind of nickel-based alloy cartridge manufacturing method, comprising orthogonal experiment steps: blank edge sampling, edge to center sampling;Sample heating and heat preservation, after solution detection sample grain size;Determine forging temperature;Sample cutting sample, sample is heated after upsetting according to different deformation amount, and test sample grain size;Determine forging deformation amount;Upsetting punching step: blank is heated to forging temperature, and is punched;Final forging temperature is: 950 DEG C;Air cooling to room temperature;Hole expansion forging step: blank is heated to forging temperature, and is expanded;Blank hole expansion deformation is forging deformation amount;Final forging temperature is: 950 DEG C;Air cooling to room temperature;Final rolling forging step: blank is heated to forging temperature, and is rolled;Blank rolling deformation is forging deformation amount;Final forging temperature is greater than or equal to 950 DEG C;Air cooling to room temperature to form product.Solve the problem in prior art scheme, selected forging temperature is lower, and it is easy to produce forging crack and forging deformation amount is smaller, and forging fire time is more.

The invention discloses a rough blank design method for improving the uniformity of a centrifugal impeller die forging, and belongs to the technical field of impeller die forging. The problems that in the prior art, due to the fact that centrifugal impeller die forgings are uneven in structure, great hidden dangers exist in safe use of parts, and the forging cost is high are solved. Comprising the following steps that S1, a small deformation area is recognized through the digital simulation technology; S2, a first groove and a second groove are formed in the upper end and the lower end of the small deformation area; S3, the top face of the first groove and the top face of the second groove are obliquely arranged; S4, the outer side walls of the first groove and the second groove are obliquely arranged away from the center lines; the rough blank design method for improving the uniformity of the centrifugal impeller die forging is used for centrifugal impeller die forging, rough blank and forging blank coordinated design is adopted, pre-forging and finish forging complementary deformation is utilized, the structure uniformity of the centrifugal impeller die forging is effectively improved, accordingly, the mechanical property of the centrifugal impeller die forging is improved, meanwhile, the forging cost is reduced, and the product quality is improved. The production efficiency is improved.

The application discloses an Al-Mg-Si alloy with micro-nano composite structure and a preparation method thereof. The Al-Mg-Si alloy comprises Mg, Mn, Si, Cu, Fe, Zn, Sc, Zr, Hf and Al. The Al-Mg-Si alloy of some examples of the application contains nano-sized strengthening phases, wherein the average diameter of the Mg2Si phase is 8-10 nm, and the average diameter of the Al3(Sc, Zr, Hf) phase is 15-20 nm. These fine nano second phases can hinder dislocation movement through the Orowan mechanism, thereby strengthening the alloy matrix. The Al3(Sc, Zr, Hf) phase has a coherent interface relationship with the aluminum matrix, and can further improve the mechanical properties of the Al-Mg-Si alloy through the cutting mechanism. The fine grains of double-size grains have obvious strengthening effect, and the coarse / fine distributed grains can coordinate strain and improve the plasticity and toughness of the alloy. The yield strength of the alloy at room temperature is 343-355 MPa, the tensile strength is 368-392 MPa, and the elongation is 11.2-14.6%, so that the alloy can be used as a light structure material for large load requirements.

The invention belongs to the technical field of steel heat treatment processing, and particularly relates to an electric pulse heat treatment method for medium carbon steel. The method comprises the following steps that S1, a steel billet is rolled, the deformation amount of the steel billet is controlled to be 70%-85% in the rolling process, and deformed steel is obtained; and S2, the deformed steel is subjected to electric pulse treatment for 10-60 min under the condition that the peak pulse current density is 45-55 A / mm < 2 >, and then the high-strength and high-plasticity steel is obtained through cooling. A large number of dislocations, vacancies and other defects can be introduced into metal through cold deformation, a large number of cementite nanoparticles are rapidly and evenly separated out in the material in cooperation with high-density pulse current, and the strength of the 45 steel is improved. In addition, the recrystallization temperature of the material can be reduced through the high-density pulse current, the material is promoted to be recovered and recrystallized within a short time, fine recrystallized grains are generated, and the strength and plasticity of the 45 steel are both improved.

The invention belongs to the technical field of rare earth magnesium alloy materials, and discloses an ultrahigh-strength rare earth magnesium alloy deformed material which is prepared from the following raw materials in percentage by mass: 7%-8.5% of Gd, 2.5%-3.5% of Y, 1.5%-2.5% of Zn, 0.3%-0.5% of Zr, 0.6%-1% of Nd, 1.2%-2% of Ag and the balance of Mg. The invention further discloses a preparation method of the magnesium alloy deformed material. The preparation method comprises the steps of smelting and casting, homogenizing treatment, variable-speed isothermal extrusion treatment, aging treatment and the like. By adding Nd and Ag elements and adjusting the ratio of all metal elements in the alloy, excellent comprehensive mechanical properties are shown, the yield strength ranges from 449 MPa to 454 MPa, the tensile strength ranges from 493 MPa to 502 MPa, and the ductility ranges from 9.4% to 10.1%.