12results about How to "Raise the recrystallization temperature" patented technology

The invention discloses a preparation method of a high-temperature-resistant, high-strength, high-electric-conductivity and high-heat-conductivity copper-niobium heterogeneous nano composite fine filament, which comprises the following steps of: 1, winding a copper strip and a niobium strip, placing the wound copper strip and niobium strip in a copper sheath, carrying out homogeneous heating and isothermal hot extrusion deformation, and then carrying out multi-pass straight drawing, intermediate annealing and disc drawing to obtain a copper-niobium composite wire; 2, bundling and assembling the copper-niobium composite wires, placing the copper-niobium composite wires in a copper sheath, carrying out homogeneous heating and isothermal hot extrusion deformation, and then carrying out multi-pass straight drawing, intermediate annealing and disc drawing to obtain a copper-niobium multi-core composite round wire; and 3, performing multi-pass drawing and vacuum annealing on the copper-niobium multi-core composite round wire in sequence. The ultra-plastic deformation process combining copper and niobium winding combination with cluster drawing is adopted, the fine wire with high tensile strength, good bending and tensile plasticity, excellent high-temperature thermal stability and high-temperature stress relaxation resistance, excellent radiation resistance and excellent strong current matching is obtained, the process is simple, control is easy, and the method is suitable for industrial production. The industrial batch production is easy to realize.

This invention relates to the field of zinc alloy surface modification technology, and particularly to a corrosion-resistant medical zinc alloy, its preparation method, and its applications. The preparation method includes the following steps: weighing raw materials according to the chemical composition of the zinc alloy; cleaning the surface of the raw materials; smelting, refining, and casting to obtain an ingot; subjecting the ingot to equal-channel angular extrusion deformation to obtain an extruded zinc alloy; performing high-energy ion implantation on the zinc alloy to obtain a nitrogen-ion-implanted zinc alloy; and preparing a coating on the surface of the nitrogen-ion-implanted zinc alloy to obtain the final product. This invention achieves a high-adhesion, dense, and uniform deposition effect on the alloy surface through the synergistic control of "equal-channel angular extrusion + high-energy nitrogen ion implantation + biomimetic coating deposition," solving the problem of severe galvanic corrosion at localized sites in existing zinc alloys under corrosive environments. Simultaneously, the dense deposition layer helps inhibit rapid dissolution of the zinc alloy surface, significantly reducing the corrosion rate of the zinc alloy in corrosive environments.

This invention discloses a lanthanum-iron-molybdenum alloy cutting wire and its manufacturing method. The lanthanum-iron-molybdenum alloy cutting wire is made by adding 0.1-0.5% lanthanum nitrate solution and 0.01-0.05% ferric nitrate solution to molybdenum dioxide powder. The manufacturing method involves loading molybdenum dioxide powder into a mixer; mixing the lanthanum nitrate solution and ferric nitrate solution to form a mixture; loading the mixture into a feeder; adding the mixture to the mixer using the feeder while stirring; washing the feeder with pure water, and adding the washed solution to the mixer while stirring; thoroughly mixing and stirring in the mixer for 20-80 minutes; heating and drying after thorough mixing; cooling; and then processing the alloy wire. With a diameter of Φ0.18mm, its tensile strength can reach 2600-3500 N / mm². 2， When used in wire EDM, it is more wear-resistant and has a longer lifespan. Lanthanum-doped iron-molybdenum wire has a high recrystallization temperature, expanding the temperature range and extending the lifespan of the molybdenum wire.

The invention belongs to the technical field of high-temperature alloy preparation, and relates to an oversized fine grain N06625 alloy plate and a rolling method and application thereof. The rolling method comprises the following steps: step 1, selecting a rolling blank with a specific specification; 2, the rolled blank is pretreated, and it is guaranteed that the surface of the rolled blank is free of cracks; 3, heating the rolled blank by using a heating furnace, and preserving heat; and 4, after heat preservation is finished, the alloy plate is discharged out of the furnace and subjected to large-deformation rolling, and the target N06625 alloy plate is obtained. The technical problems that a uniform structure and a fine grain structure are difficult to form in a traditional thermal forming process, and the risk of crystal mixing exists are solved; in addition, due to the fact that N06625 is difficult to form and a hot working window is narrow, N06625 can be formed into an oversized specification at a time through the method, the structure is uniform, and the grain size is larger than or equal to grade 8.

The invention discloses a reed with good durability and a preparation method thereof, and relates to the technical field of reeds. The preparation method of the reed with good durability comprises the following steps: taking raw materials, smelting the raw materials in an argon atmosphere, and casting and cooling the raw materials to obtain a cast ingot; the cast ingot is subjected to homogenization treatment, surface milling is conducted after furnace cooling, and then blooming is conducted; annealing is carried out after primary rolling, finish rolling is carried out, a thin strip is obtained, stamping cutting and annealing are carried out, and a rough reed is obtained; the rough reed is taken, cleaned, dried and polished and then placed in a passivation solution to be soaked, and the finished reed is obtained; the passivation solution comprises the following raw materials in percentage by mass: 1-4% of benzotriazole, 0.3-0.5% of a surfactant, 2-5% of a corrosion inhibitor, 12-15% of phytic acid, 1-2% of citric acid, 2-5% of ethanol and the balance of deionized water. The finally prepared reed has a hydrophobic surface and good corrosion resistance.

A kind of low cracking tendency mandrel steel adopting continuous casting big square billet rolling and its manufacturing method, its component mass percentage is as follows: C 0.33~0.38%, Mn 0.40~0.60%, Si 0.80~1.25%, Cr 4.75~5.25%, Mo 1.10~1.20%, V 0.30~0.40%, Nb 0.035~0.06%, Ti 0.012~0.020%, H≤2.0ppm, the rest is Fe and other inevitable impurities.The application is designed by Nb-Ti microalloying and lower H content, combined with high-temperature heating and long-time holding, effectively ensures that the deformation amount in rolling process does not fall within the range of critical deformation amount, avoids the formation of local abnormal coarse structure caused by insufficient local recrystallization, avoids the formation of low plasticity and toughness structure, thereby reduces the cracking tendency under residual tensile stress and the cracking tendency of hydrogen-induced delayed cracking, at the same time, the interval time between rolling and annealing is greatly extended from original 24h to 72h, greatly reduces the cracking proportion in the process of waiting annealing after rolling, improves the yield, is beneficial to save cost, reduce energy consumption, improve efficiency.

The invention provides high-strength and high-hole-expansion steel. The high-strength and high-hole-expansion steel comprises, by mass, 0.04%-0.12% of carbon, smaller than or equal to 0.1% of silicon, 1.3%-1.7% of manganese, smaller than or equal to 0.002% of sulfur, smaller than or equal to 0.015% of phosphorus, 0.01%-0.03% of niobium, 0.0014%-0.06% of vanadium, 0.1%-0.15% of titanium, 0.08%-0.18% of molybdenum, 0.02%-0.05% of acid-soluble aluminum and smaller than or equal to 0.006% of nitrogen. The high-strength and high-hole-expansion steel prepared by the preparation method disclosed by the invention has relatively good hole expansion property while considering the strength, and is high in practicability and worthy of popularization.

The invention belongs to the technical field of aluminum-based materials, and particularly relates to a high-strength and high-elongation 1100D aluminum foil and a preparation method thereof. Through composite addition of multiple elements such as RE and Zr and fine process control, the material strength is remarkably improved while good plasticity and machinability of the aluminum foil are guaranteed, the prepared aluminum foil overcomes the problem that the strength of a traditional 1100 series alloy is low or the ductility is sharply reduced after the strength is improved, and the comprehensive mechanical property of the aluminum foil is superior to that of a conventional product.

The application discloses a two-dimensional nitrogen-doped carbon material loaded rhenium-based alloy nanoparticle electrocatalyst, and a preparation method thereof. The preparation method comprises the following steps: dissolving a rhenium-based metal salt, a transition metal salt, a purine small molecule and an inorganic salt in water to perform a hydrothermal reaction, so as to obtain a two-dimensional structure precursor; and calcining the two-dimensional structure precursor under the protection of an inert gas, so as to obtain the electrocatalyst. The high-melting-point rhenium metal is used to form alloy nanoparticles with the transition metal, so that the defects of sintering of the transition metal-based catalyst in a high-temperature synthesis process can be effectively avoided, the aggregation and growth of the alloy nanoparticles in the high-temperature synthesis process are prevented, the alloy nanoparticles are uniformly and highly densely loaded on the surface of a two-dimensional carbon nitride carrier, the proportion of surface metal atoms is greatly increased, and finally, the prepared electrocatalyst has good hydrogen evolution reaction catalytic activity and catalytic stability.

The invention relates to the field of metal materials, in particular to a niobium-containing 304 austenitic stainless steel plate for nuclear power and a preparation method of the niobium-containing 304 austenitic stainless steel plate for nuclear power, and the niobium-containing 304 austenitic stainless steel plate comprises the following components in percentage by mass: 0.02%-0.06% of C, 1.00%-2.00% of Mn, 0.20%-0.75% of Si, 0-0.030% of P, 0-0.005% of S, 18.00%-19.50% of Cr, 8.00%-10.50% of Ni, 0.2%-0.8% of Nb, 0-0.10% of Cu, 0-0.10% of Co, 0-0.10% of N and the balance of Fe and other inevitable impurities. The 304 austenitic stainless steel is improved, and the niobium element is added, so that stable production of the 304 austenitic stainless steel plate for nuclear power can be ensured, the 304 austenitic stainless steel plate has excellent grain size, intergranular corrosion resistance and mechanical property, and the design requirements of steel for nuclear power are met.

The invention relates to an easy-to-weld molybdenum-rhenium alloy and a preparation process thereof, ammonium tetramolybdate, Re powder and ZrC powder are uniformly mixed and then calcined, then hydrogen reduction is performed to obtain alloy composite powder, and the alloy composite powder is sequentially subjected to cold isostatic pressing, pressureless sintering, hot isostatic pressing sintering, high-temperature rolling and annealing to obtain a high-density easy-to-weld molybdenum-rhenium alloy plate. The ZrC particles are added into the molybdenum-rhenium alloy, the prepared molybdenum-rhenium-zirconium carbide composite powder particles are submicron and nearly spherical, the powder sintering activity is effectively improved, grain growth in the sintering process is effectively hindered through introduction of secondary phase zirconium carbide, and grains can be refined. Zirconium carbide is dispersed and distributed in a high-density and easy-to-weld molybdenum-rhenium alloy matrix, in the welding process, zirconium carbide can absorb oxygen at an alloy grain boundary, purify the grain boundary and generate zirconium oxide in situ, recrystallization embrittlement caused by rapid growth of grains in the welding process is inhibited, the strength, plasticity and toughness of the molybdenum-rhenium alloy can be effectively improved, and the welding performance of the molybdenum-rhenium alloy is improved.

This invention belongs to the technical field of welding materials and discloses a high-temperature resistant multi-element high-entropy alloy brazing filler metal and its preparation method. By mass fraction, it comprises the following components: Co 15%–25%, Ni 15%–25%, Cr 15%–25%, Fe 15%–25%, Cu 15%–25%, Mn 0.1–3%, Si 0.1–6%, B 0.1–5%, Sc 0.5–0.9%, and Y 0.1–1%. The preparation method of this invention is simple to operate, low in cost, highly efficient, and highly adaptable, showing great application potential. The high-entropy alloy brazing filler metal of this invention can be used in high-temperature, high-pressure, and corrosion-resistant environments after welding.