399results about How to "High yield strength" patented technology

The invention provides a production method of an invar alloy 4J36 hot-rolled coil, belongs to the technical field of invar alloy 4J36 hot rolling, and solves the problem that the invar alloy 4J36 hot-rolled coil needs to be efficiently produced. The plate blank is preheated and then heated after being ground, and the heated plate blank is subjected to high-pressure water descaling; and the descaled plate blank is rolled into an intermediate blank through seven-pass rough rolling, the intermediate blank is rolled into a black coil through five-pass steckel mill finish rolling, and the black coil is rolled into an invar alloy 4J36 hot-rolled black coil finished product. The method comprises the steps of slab component control, slab preheating and heating, rough rolling to obtain an intermediate slab, steekle mill rolling, coiling and the like, and surface oxidation generated in the heating process is reduced by adjusting the heating process; and through rolling of the steekle mill, dynamic recrystallization is fully carried out, the surface quality of the produced invar alloy 4J36 hot-rolled coil meets the product requirement, and the yield and the production efficiency are both remarkably improved.

The invention relates to the field of matt films, in particular to a scratch-resistant BOPP (biaxially-oriented polypropylene) matt film and a preparation method thereof. The scratch-resistant BOPP matt film comprises an upper surface matt layer, a middle core layer and a lower surface layer which are sequentially arranged, the upper surface matting layer comprises a matting master batch; the matting master batch comprises 28 to 50 weight percent of co-polypropylene, 8 to 14 weight percent of ethylene-octylene block copolymer, 6 to 10 weight percent of micro-crosslinked polypropylene and 30 to 50 weight percent of high-density polyethylene; the ethylene-octylene segmented copolymer comprises a hard segment with low octylene content and high crystallinity, and an amorphous soft segment with high octylene content; the middle core layer comprises homo-polypropylene; the lower surface layer comprises a smooth surface layer or an extinction layer. By utilizing the synergistic effect of the ethylene-octylene block copolymer and the micro-crosslinked polypropylene, the compressive deformation performance, the impact strength, the tensile strength and the yield strength of the co-polypropylene are improved, the indentation of a film surface in a scraping pressure applying stage and the scratches and damages generated in a sliding stage are reduced, the scratch resistance of the upper surface matting layer is improved, and the matting effect is ensured.

The invention discloses a pure smelting method for nickel-based superalloy, which relates to the technical field of metal smelting and comprises the following steps: (1) screening high-purity raw materials; (2) selecting a vacuum induction melting furnace and carrying out vacuumizing treatment; (3) sequentially adding the pretreated raw materials into a vacuum induction melting furnace, and heating and melting the raw materials; (4) carrying out electromagnetic stirring; (5) preparing special electroslag, and drying and crushing the electroslag; and (6) casting the alloy liquid subjected to vacuum melting into a consumable electrode, inserting the consumable electrode into the slag of the electroslag remelting furnace, and electrifying. According to the design scheme, impurities in the nickel-based superalloy are effectively removed, the purity and uniformity of the alloy are improved, the mechanical property and thermal stability of the alloy are improved, the service life is prolonged, and a better purification effect is achieved.

The medium-temperature radial forging method comprises the steps that pretreatment is conducted, specifically, a niobium-tungsten alloy extrusion bar blank is heated for 60-180 minutes at the temperature of 750-950 DEG C, rapid forging and straightening are conducted, and a medium-temperature radial forging bar blank is obtained and annealed for 60-120 minutes at the temperature of 1250-1450 DEG C; medium-temperature radial forging is conducted, specifically, a two-step method is adopted, in the first step, a bar blank is preheated to 80-100 DEG C and coated with Ta1350 high-temperature glass powder, heat preservation is conducted for 90-180 minutes at the temperature of 1050-1150 DEG C, and the bar blank is forged into a bar with the diameter of 70 + / -1 mm in the mode that the diameter is reduced by 7-10 mm every time; and in the second step, the heating and coating processes are repeated, the diameter is reduced by 5-7 mm every time, and the bar with the required specification is manufactured. By optimizing the medium-temperature forging and annealing process, the fine grain structure is controlled, the high-temperature mechanical property, creep resistance and oxidation resistance of the material are improved, and the material is suitable for aerospace engines and other high-temperature and high-pressure scenes. Compared with a traditional method, the technology improves the yield, shortens the production period, reduces the labor intensity, is suitable for large-scale production, reduces surface air suction, oxidation and burning loss, and improves the production efficiency and the finished product quality.

The invention discloses a composite regulation and control method for improving the performance of a laser additive manufacturing high-strength aluminum alloy, and relates to the technical field of laser additive manufacturing high-strength aluminum alloy materials, micron-sized ceramic particles and micron-sized AlMgScZr alloy powder are mixed, and ceramic particle reinforced aluminum-based composite powder is prepared. According to the composite material powder, the solidification structure is regulated and controlled through the characteristics of ceramic particles, stress concentration is reduced, and meanwhile the reinforcing phase particle aggregation phenomenon is avoided. The obtained composite material is excellent in quality and few in metallurgical defects in laser forming, and the density reaches up to 99.8% or above. By combining the optimized selective laser melting and heat treatment process, the room-temperature mechanical property of the prepared composite material part is remarkably improved, the tensile strength exceeds 540 MPa, the yield strength exceeds 490 MPa, and the elongation at break exceeds 10%.

The invention provides a high-heat-conductivity and high-corrosion-resistance magnesium alloy suitable for a mobile phone middle plate and a preparation method of the high-heat-conductivity and high-corrosion-resistance magnesium alloy, and belongs to the technical field of magnesium alloy materials. The magnesium alloy is composed of, by mass, 3.0%-5.0% of Al, 1.0%-3.0% of Ce, 0.5%-2.0% of Nd, 0.1%-1.0% of Sn, impurity elements Fe smaller than or equal to 0.06%, Cu smaller than or equal to 0.004%, Ni smaller than or equal to 0.002% and the balance magnesium. After the magnesium alloy is subjected to a 7-day neutral salt spray experiment, the measured weightlessness corrosion speed is 0.236 mm / y, the yield strength reaches 150-160 MPa, the tensile strength is 250-280 MPa, the ductility is 8-12%, and the heat conductivity is 110-120 W / (m.K).

The invention relates to the technical field of nodular cast iron, in particular to a silicon-molybdenum-chromium-nickel-niobium nodular cast iron material and a preparation method thereof. The material comprises the following chemical components in percentage by mass: 3.0%-3.5% of carbon, 4.3%-4.7% of silicon, 0.1%-0.3% of manganese, less than or equal to 0.05% of phosphorus, less than or equal to 0.02% of sulfur, 0.7%-1.0% of molybdenum, 0.6%-0.8% of chromium, 0.4%-0.7% of nickel, 0.3%-0.6% of niobium, 0.03%-0.06% of magnesium, 0.05%-0.1% of rare earth, 0.006%-0.012% of antimony and the balance of iron. The preparation method comprises the steps of smelting, first-time spheroidizing and inoculation, second-time spheroidizing, second-time inoculation and heat treatment in sequence. According to the obtained nodular cast iron material, the form of graphite and the number of graphite nodules are improved, carbon elements are separated out as many as possible in the form of high-carbon phase-spheroidal graphite, generation of pearlite is reduced, and the mechanical strength and high-temperature resistance of nodular cast iron are improved.

The invention provides a continuous production method of a high-strength and high-toughness austenitic stainless steel plate with a 3D full-gradient structure, and belongs to the technical field of stainless steel plate production. According to the method, an austenitic stainless steel plate is subjected to cold rolling and cutting, the size specification and the surface quality of the austenitic stainless steel plate are controlled, and then the rolled austenitic stainless steel plate is subjected to austenitizing treatment; or the austenitic stainless steel plate is firstly subjected to hot rolling to control the size specification, then rapid cooling is conducted, and the coarse-grain single-phase austenite structure is obtained. And then, reciprocating torsional deformation is conducted on the coarse-grain single-phase austenitic stainless steel plate, on the basis that the macroscopic size specification of the coarse-grain single-phase austenitic stainless steel plate is not changed, combination of the strength and the toughness of the coarse-grain single-phase austenitic stainless steel plate is greatly improved, and finally the plate is rolled into a The size specification and the surface quality of the plate are accurately controlled by adjusting a rolling process; and meanwhile, controllable construction of a 3D full-gradient structure is achieved by regulating and controlling reciprocating torsion technological parameters, and therefore cooperation of high strength and high toughness is achieved.

The invention provides a preparation method of a micro TiAl alloy wire, and relates to the technical field of TiAl alloy preparation. The preparation method comprises the steps of raw material selection and treatment of a wire material, raw material twisting of the wire material, continuous warm drawing of a primary TiAl composite stranded wire, twisting of the primary TiAl composite wire, continuous warm drawing of a secondary TiAl composite stranded wire, repeated warm drawing of the TiAl composite wire, continuous extrusion of the TiAl wire and diffusion homogenization of the TiAl alloy wire which are sequentially carried out. According to the preparation method, the TiAl alloy wire with uniformly distributed components can be directly prepared at a lower temperature by combining multiple wire twisting, multiple continuous hot drawing and final diffusion homogenization annealing, the high-temperature melting process is effectively avoided, the components and the diameter of the TiAl alloy wire can be designed according to the requirements of the target TiAl alloy wire for the passes in the preparation and extrusion process of the TiAl composite wire, and the preparation process of the TiAl alloy wire is simplified. The method is high in flexibility, simple to operate, wide in application, low in cost and very suitable for large-scale industrial production.

The invention provides a high-strength pure titanium rod wire and a preparation method thereof, and relates to the technical field of biomedical metal materials, and the preparation method comprises the following steps: preparing materials according to industrial pure titanium components, carrying out vacuum consumable smelting to obtain a titanium ingot blank, and carrying out cogging forging and continuous rolling on the titanium ingot blank to obtain a coiled rod blank; the coiled bar blank is subjected to hot drawing to obtain a pure titanium bar, and the pure titanium bar subjected to hot drawing is sequentially subjected to scaling treatment, heat treatment, cold drawing, sliding block straightening, stress relief annealing and centerless grinding to obtain a finished product of the high-strength pure titanium bar wire. According to the method, the surface reduction rate is controlled through cold drawing, the performance of the rod wire is adjusted through a reasonable heat treatment system, metastable structures in the alloy are obviously deformed and close to each other through cold drawing, the deformation amount of cold drawing is continuously increased, grain boundaries and dendritic grain boundaries are close to each other, the interface distance is gradually reduced, grains and the metastable structures are refined, and the yield of the rod wire is increased. Due to the increase of dislocation density and grain refinement, the yield strength and tensile strength of the cold-drawn pure titanium rod wire are improved.

The invention relates to a production process of an ultrahigh-strength special-shaped barrel. The production process comprises the following steps: preparing a barrel blank according to the size; material distribution grooves are symmetrically formed in the positions, close to the two ends, of the outer side of the barrel, the sections of the material distribution grooves are triangular, the outer angle of the outer side edge of each triangle ranges from 94 degrees to 100 degrees, and the outer angle of the inner side edge of each triangle ranges from 140 degrees to 160 degrees; the local mandrel is drawn out, specifically, the heating number is 1-2, forging heating is conducted to 425-445 DEG C in each heating number, and only the part, located between the outer sides of the two material distribution grooves, of the barrel blank is drawn out; and local trestle reaming: 1-3 heating numbers, forging and heating each heating number to 425-445 DEG C, and only carrying out trestle reaming on the part of the barrel blank between the outer sides of the two material distribution grooves to drive the inner and outer diameters of flanges at the two ends of the barrel blank to grow together. According to the ultra-high-strength special-shaped barrel production process, materials are prevented from being accumulated at flanges at the two ends of a barrel body, meanwhile, the utilization rate of the materials is increased, the utilization rate of raw materials is increased to 38% from 28%, small-specification raw materials can be selected, and the forgeability, the formability and the structure are all allowed to be greatly improved.

The invention provides 1900MPa-grade cold-rolled medium manganese steel and a preparation method thereof, and relates to the technical field of high-strength and high-toughness automobile steel. The thickness of the 1900 MPa-grade cold-rolled medium manganese steel ranges from 1.3 mm to 1.5 mm, and the 1900 MPa-grade cold-rolled medium manganese steel is prepared from, by mass, 0.22%-0.25% of C, 6.5%-7.5% of Mn, 1.2%-1.7% of Al, 0.7%-0.9% of Si and Plt. 0.005%, Slt; 0.02% of the total weight; and the balance of Fe and inevitable impurities. The preparation method comprises the steps of raw material preparation, smelting, casting, forging, hot rolling, two-phase region annealing, tempering, cold rolling, quenching and baking treatment. According to the invention, by optimizing the two-phase region annealing process and the quenching temperature, ultrafine-grained ferrite, austenite and martensite microstructures are formed, the strength of the medium manganese steel is greatly improved, the enough percentage elongation after fracture is ensured, and the performance requirements of automobile anti-collision structural components are met.

The invention relates to the technical field of metal materials and processing thereof, and discloses a rare earth metal reinforced 6063 aluminum alloy semi-solid casting process which comprises the following steps: S1, preparing 0.6-0.7% of magnesium; 0.5%-0.7% of silicon; 0.05%-0.1% of manganese; 0.1%-0.3% of copper; 0.05%-0.15% of titanium; 0.05% to 0.15% of zirconium; 0.1%-0.3% of rare earth elements; s2, the high-purity aluminum ingot is placed in a vacuum melting furnace to be heated until the high-purity aluminum ingot is completely melted; s3, cooling the melt to a liquid-solid two-phase region; s4, the melt subjected to semi-solid treatment is injected into a metal mold with the dynamic temperature control function; s5, the casting is subjected to staged dynamic heat treatment; and S6, leftover materials generated in the casting process are classified and screened. And the precipitation form and distribution of a strengthening phase are optimized through variable-temperature solid solution and two-stage aging processes in dynamic heat treatment, and the toughness of the material is improved.

The utility model relates to the technical field of emulsion pumps, and discloses a double back-suction type all-plastic emulsion pump which is of an all-plastic structure and comprises a pump body, a pressing head, a main column, an auxiliary column, a spring, a one-way ball valve, a piston and a back-suction rod. The main column is provided with a back suction cavity located between the inner wall of the main column and the outer wall of the auxiliary column and communicated with the pressing head. The piston movably sleeves the auxiliary column in a sealing manner, is movably connected with the inner wall of the pump body in a sealing manner, and is movably connected with the inner wall of the lower end of the main column in a sealing manner to seal and close the lower end of the back-suction cavity; and the upper end of the resorption rod is movably and hermetically nested in the secondary column. According to the double back-suction type all-plastic emulsion pump, a double back-suction structure or a back-suction structure can be formed between the main column and the piston and between the auxiliary column and the back-suction rod, materials of the pressing head can be quickly sucked back or back into the back-suction cavity and the inner cavity of the auxiliary column, the back-suction space is large, the back-suction efficiency is high, and the back-suction effect is good. The problem of waste or pollution caused by residual feed liquid after the liquid is discharged from the pressing head is solved, and the use is cleaner, more environment-friendly and more sanitary.

The invention relates to the field of metal material casting, and discloses a production method of green sand as-cast high-plasticity nodular cast iron QT800-5, which comprises the following steps: preparing pig iron, waste steel and foundry returns, and using auxiliary materials such as a silicon carbide pretreating agent, a high-temperature graphitization carburant, a rare earth magnesium silicon iron nodulizing agent, a silicon barium nucleating agent and a silicon strontium nucleating agent to prepare the green sand as-cast high-plasticity nodular cast iron QT800-5. The purity and component stability of molten iron are ensured; in the smelting process, purification and adjustment are carried out through temperature control and segmented addition of auxiliary materials, then spheroidizing is carried out through a pouring method, and the microscopic structure of a casting is optimized through ladle-to-ladle inoculation and stream inoculation; the final casting has excellent mechanical properties including the tensile strength larger than or equal to 800 MPa, the yield strength larger than or equal to 480 MPa, the elongation larger than or equal to 5% and the matrix pearlite content larger than or equal to 80%. The production process disclosed by the invention is simplified, is suitable for large-scale industrial production, and has a wide application prospect in lightweight application requiring high-strength and high-plasticity materials.

The high-strength cold-rolled flat steel product with reduced sensitivity to hydrogen embrittlement according to the present invention comprises a steel substrate consisting of, in mass%, C: 0.20% to 0.40%, Mn: 1.50% to 3.00%, Si: 0.90% to 1.50%, Al: 0.005% to 1.00%, V: 0.01% to 0.30%, optionally Cr: 0.01% to 1.00%, optionally Mo: 0.005% to 0.20%, optionally B: 0.00001% to 0.002%, optionally Nb and Ti: a total content of Nb and Ti of 0.005% to 0.2%, P: up to 0.020%, S: up to 0.005%, N: up to 0.008%, and the balance being Fe and unavoidable impurities. The remainder being Fe and unavoidable impurities, the sum of the proportions of the impurities being < = 0.8%, and the microstructure of the steel substrate comprising, in area%, 65% to 92% of primary (tempered) martensite and at least 8% of retained austenite (RA), the remainder is filled with up to 27% secondary (untempered) martensite, up to 10% bainite or bainite ferrite and / or up to < = 5% polygonal ferrite, the sum of the proportions of secondary (untempered) martensite, bainite or bainite ferrite and polygonal ferrite < = 27%. The invention also provides a method for reliably manufacturing the flat steel product.

The invention provides a method for preparing austenite aging steel based on injection molding, and belongs to the technical field of steel materials. The modified raw materials such as the sulfur-carbon-molybdenum composite powder, the nitrogen-nickel composite powder and the boron-phosphorus-chromium composite powder are matched with the components such as the silicon powder, the manganese powder and the iron powder, the austenite aging steel is obtained through injection molding, the density of the austenite aging steel material is improved, and meanwhile the mechanical property and hardness of the austenite aging steel material are improved.

The invention relates to a preparation method of a multi-scale SiC particle heterostructure reinforced magnesium-based composite material, and belongs to the field of metal-based composite materials and preparation thereof. According to the preparation method, an in-situ authigenic second phase generated by rare earth elements is added, micron-scale, submicron-scale and nano-scale SiC reinforcement particles form a heterostructure formed due to size difference, and after a subsequent plastic deformation process, the multi-scale reinforcement particles form a heterostructure with a layered distribution characteristic; the effects of second phase strengthening, reinforcement particle strengthening and heterostructure strengthening are generated, and meanwhile the modulus and strength of the magnesium-based composite material are improved. And moreover, a stirring casting mode is adopted for preparation, the production process is shortened, the production cost is reduced, the high-modulus and high-strength magnesium-based composite material is prepared, and the preparation method has important significance in promoting application of the high-performance magnesium-based composite material and expanding the application range of the magnesium-based composite material in the fields of automobile industry, aerospace and the like.

The invention discloses ferritic stainless steel with good high-temperature strength and machinability and a preparation method of the ferritic stainless steel. The preparation method of the ferritic stainless steel with the good high-temperature strength and machinability comprises the steps of smelting, continuous casting, coping, hot rolling, primary annealing, cold rolling, secondary annealing and acid pickling. The ferrite stainless steel with the good high-temperature strength and machinability comprises, by mass, 0.008%-0.015% of C, 0.30%-0.55% of Si, 0.30%-0.55% of Mn, smaller than or equal to 0.035% of P, smaller than or equal to 0.002% of S, 17.80%-18.20% of Cr, larger than or equal to 4 (C + N) + 0.20% of Ti, 0.15%-0.25% of Ni, smaller than or equal to 0.03% of Mo, smaller than or equal to 0.01% of Nb, 0.007%-0.013% of N, smaller than or equal to 0.10% of Cu, 0.03%-0.05% of Al and the balance Fe and inevitable impurities. According to the ferritic stainless steel with good high-temperature strength and machinability prepared by the method, the yield strength and tensile strength at normal temperature and 320 DEG C are effectively improved, and the manufacturing cost is low.

The invention discloses a nickel-iron-chromium-based high-temperature alloy with high strength and high structure stability and a preparation method of the nickel-iron-chromium-based high-temperature alloy. The nickel-iron-chromium-based high-temperature alloy comprises, by weight, 0.03%-0.10% of C, 15%-25% of Fe, 16%-21% of Cr, 1.0%-2.5% of Ti, 0.5%-2.1% of Al, 1.0%-3.0% of Co, 0.3%-1.0% of Mo, 0.001%-0.01% of B, 0.1%-0.5% of W and the balance Ni. According to the nickel-iron-chromium-based high-temperature alloy disclosed by the invention, a gamma'phase and M23C6 are main strengthening phases; compared with the prior art, the material has the advantages of equivalent processability, low material cost and more excellent high-temperature strength and structure thermal stability, and can be used for manufacturing boiler last-stage superheater / reheater pipelines of ultra-supercritical thermal power generating units with the temperature of 700 DEG C and above.

The invention discloses a preparation method of a high-strength and high-plasticity Al-Cu alloy with a heterogeneous grain structure, and particularly relates to the field of aluminum alloys. Comprising the following steps: respectively weighing raw materials according to dosage; cu, Mn, Sc, Ti, Al and Mg are smelted, and an Al-Cu series alloy cast ingot is obtained; the alloy ingot is subjected to multi-pass hot rolling deformation and multi-pass cold rolling deformation, and a cold-rolled plate is obtained; and the cold-rolled plate is sequentially subjected to annealing, solid solution treatment and aging treatment, and the Al-Cu alloy is obtained. By regulating and controlling technological parameters of rolling deformation and heat treatment, a plurality of strengthening mechanisms including heterogeneous deformation induction strengthening are introduced, so that the strength and plasticity of the alloy are greatly improved.

The invention discloses a micro-arc oxidation surface modified biomedical titanium alloy with good friction corrosion resistance and a preparation method of the micro-arc oxidation surface modified biomedical titanium alloy. The micro-arc oxidation surface modified biomedical titanium alloy comprises a titanium alloy base material and a micro-arc oxidation coating located on the surface of the titanium alloy base material. The micro-arc oxidation coating comprises a compact layer and a sparse layer which are sequentially connected with the titanium alloy base material. EDS element analysis shows that the micro-arc oxidation coating contains a sodium element, an oxygen element, an aluminum element, a phosphorus element, a potassium element, a titanium element and a niobium element. The preparation method comprises the following steps: preparing a micro-arc oxidation electrolyte, wherein the micro-arc oxidation electrolyte comprises sodium titanate, potassium hydroxide, sodium hexametaphosphate and niobium particles; the titanium alloy base material serves as an anode, a stainless steel sheet serves as a cathode, the micro-arc oxidation electrolyte is loaded into an electrolytic cell, then a micro-arc oxidation electrolytic reaction is conducted, and the micro-arc oxidation coating is generated on the surface of the titanium alloy base material.

The invention discloses an aluminum alloy material, a battery shell and a power battery, the aluminum alloy material at least comprises Al, Mn, Si, Cu, Fe and Ce, the mass percentage content of Ce is 0.3-1 wt%, the battery shell is prepared from the aluminum alloy material, and the power battery comprises the battery shell. The Ce with the specific content is creatively used as the raw material to be added into the aluminum alloy for modification treatment, aluminum grains can be reduced by half to one third, the grains can be refined, dislocation movement is effectively hindered, and then the strength and hardness of the aluminum alloy material are improved.

The invention discloses a water-based intermediate coat composition with low-temperature stone impact resistance, water-based intermediate coat prepared from the water-based intermediate coat composition and application of the water-based intermediate coat composition. The water-based intermediate coat composition is prepared from the following components in parts by weight: 4 to 8 parts of water-based polyurethane dispersion A, 8 to 15 parts of water-based polyurethane dispersion B, 2 to 5 parts of methylated amino resin, 5 to 10 parts of mixed etherified amino resin and 0.2 to 0.4 part of phosphate adhesion promoter, wherein the hydroxyl value of the waterborne polyurethane dispersion A is lt; the acid value is 20-35 mgKOH / g, and the number-average molecular weight is gt; the particle size of the resin is 50-100nm, and the pH (Potential of Hydrogen) of the dispersion is 7.0-8.5; the hydroxyl value of the waterborne polyurethane dispersion B is 95-125 mgKOH / g, the particle size of the resin is 30-80 nm, and the pH value of the dispersion is 7.0-9.0.

The invention relates to the field of casting, and discloses a production method of green sand as-cast high-plasticity nodular cast iron QT450-18, which comprises the following steps of: preparing pig iron, waste steel and foundry returns according to a certain proportion, and preparing the green sand as-cast high-plasticity nodular cast iron QT450-18 by using auxiliary materials such as a silicon carbide pretreatment agent, a high-temperature graphitization carburant, a rare-earth magnesium silicon iron nodulizer, a silicon barium inoculant and a silicon strontium inoculant. And purity and component stability of molten iron are ensured. In the smelting process, purification and adjustment are carried out through accurate temperature control and segmented addition of auxiliary materials, then spheroidizing is carried out through a pouring method, and the microstructure of a casting is optimized through ladle-to-ladle inoculation and stream inoculation. The final casting has excellent mechanical properties, including tensile strength greater than or equal to 440 MPa, yield strength greater than or equal to 300 MPa, elongation greater than or equal to 16%, and V-shaped notch normal temperature impact absorption energy greater than or equal to 8 J. The method is simple and convenient to operate, high in production efficiency and suitable for large-scale industrial production.

The invention relates to a high-formability anodizing 6xxx aluminum alloy plate and a preparation method thereof. The aluminum material is composed of the following components in percentage by mass: 0.2-0.6% of Si; 0.6%-1.1% of Mg; 0.01% to 0.04% of Ti; according to the preparation method disclosed by the invention, by regulating and controlling semi-continuous casting, hot rolling and cold rolling processes, the grain size of the finished aluminum alloy plate is uniform and fine, the average grain size is 20-60 microns, the surface roughness of the plate strip is 0.25-0.45 microns, the glossiness is 350-420 GU, the tensile strength is 70-90 MPa, the yield strength is 30-50 MPa, the elongation is 30-45%, and the hardness HV is 25-45; and after the plate is subjected to subsequent room-temperature stamping forming, the surface quality is excellent, the defects of scratches, orange peels, cracks and the like are avoided, and the technical requirements of high-end products on appearance decoration surfaces are met.

The invention discloses a rolling deformation method for improving the mechanical property of a CoCrFeNiMo0.35 high-entropy alloy, through high-temperature severe plastic deformation, the structure of the CoCrFeNiMo0.35 high-entropy alloy is refined, meanwhile, as-cast sample structure defects such as air holes can be eliminated, the alloy structure is densified, and along with the increase of rolling reduction, the mechanical property of the CoCrFeNiMo0.35 high-entropy alloy is improved, so that the mechanical property of the CoCrFeNiMo0.35 high-entropy alloy is improved. And further refining of crystal grains is effectively promoted. This is the first main factor causing improvement of the mechanical property of the alloy. Besides, in the hot rolling deformation process, alloy grains are stretched into a flat shape in the rolling direction, the volume fraction of a sigma phase is increased along with increase of rolling reduction, the sigma phase is a common hard phase in the high-entropy alloy, and therefore improvement of the alloy strength can be promoted, and the strength of the alloy is improved. The room-temperature tensile engineering stress-strain curve of the CoCrFeNiMo0.35 high-entropy alloy corresponding to different rolling reduction amounts is shown in the figure 7. It can be seen that when the rolling reduction is increased from 10% to 50%, the yield strength and the tensile strength of the alloy are both obviously improved.

The invention discloses novel high-toughness corrosion-resistant stainless steel and a preparation method thereof, and relates to the technical field of stainless steel. The novel high-toughness corrosion-resistant stainless steel is prepared from the following elements in percentage by mass: less than or equal to 0.06 percent of C, 13 to 13.9 percent of Cr, 5.6 to 6 percent of Ni, 1.5 to 2.5 percent of Mo, 2.1 to 2.4 percent of Cu, 0.4 to 1.1 percent of Si, 0.5 to 1.1 percent of Mn, 0.15 to 0.35 percent of Nb, less than or equal to 0.015 percent of P, less than or equal to 0.01 percent of S and the balance of Fe and other inevitable impurity elements. According to the novel high-toughness corrosion-resistant stainless steel and the preparation method thereof, the novel high-toughness corrosion-resistant stainless steel has high toughness, corrosion resistance and certain mechanical strength, and can meet the comprehensive performance requirements of high strength, high toughness and corrosion resistance under the coastal environment working condition.

The invention provides a hot continuous rolling ultrahigh-strength steel plate and a preparation method thereof, and the hot continuous rolling ultrahigh-strength steel plate comprises the following components in percentage by mass: 0.10-0.20% of C, 0.15-0.30% of Si, 4.5-5.5% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.20-0.42% of V, 0.30-0.50% of Mo and the balance of Fe. By adding V and Mo in the steel plate with the Mn content of 4.5-5.5%, nano precipitation of second-phase particles is regulated and controlled, and the material strength is improved; and martensite is converted into austenite through inverse phase change cover annealing, the deformation induced plasticity effect is achieved in the plastic deformation process, and the ductility, the yield strength and the tensile strength of the steel are effectively improved. The yield strength of the steel plate ranges from 1025 MPa to 1060 MPa, the tensile strength ranges from 1200 MPa to 1332 MPa, the ductility ranges from 15.0% to 18.0%, and the Akv at the temperature of 0 DEG C ranges from 60 J to 90 J.

The invention provides a preparation method of micro low-oxygen spherical TiAl alloy powder, and relates to the technical field of spherical titanium-based alloy powder. The preparation method comprises the steps of raw material selection and treatment of a wire material, preparation of a TiAl composite wire, preparation of a TiAl alloy wire, treatment of the TiAl alloy wire, establishment of a gas system, high-frequency induction preheating, radio frequency plasma smelting and atomization powder preparation which are sequentially carried out. According to the method, through multiple wire twisting, multiple continuous hot drawing, diffusion homogenization annealing, high-frequency induction preheating, radio frequency plasma smelting and atomization powder preparation, the TiAl alloy wire with the evenly-distributed components can be directly prepared at the low temperature, then the TiAl alloy fine powder with the low oxygen content and the evenly-distributed components is prepared, the TiAl alloy fine powder is suitable for additive manufacturing, and the method is suitable for being used for additive manufacturing. The method is high in flexibility, simple to operate, wide in application, low in cost and very suitable for large-scale industrial production.