23results about How to "Good plasticity" patented technology

The invention relates to a method for improving the strength and plasticity of an additive manufacturing titanium alloy through Si. The method comprises the following steps: (1) mixing silicon source powder and titanium source powder to obtain mixed powder; (2) taking ball-milling mixing as an example: carrying out ball-milling mixing on the prepared mixed powder under the protection of argon; and (3) the mixed powder obtained after ball milling is subjected to a forming process, and a titanium alloy block is obtained. The forming process is additive manufacturing and comprises a direct laser deposition technology, a laser powder bed melting technology and the like. According to the method, the strength and plasticity of the titanium alloy are greatly improved without heat treatment.

The application discloses high-strength and high-corrosion-resistance continuous pipe and a preparation method thereof. After compounding, the pipe is smelted into a coil plate; the coil plate is pretreated, and then ion implantation, passivation and heat treatment are sequentially performed; the coil plate is longitudinally cut into a steel strip; the end of the steel strip is processed into 45 degrees, and a bevel is formed into I type, V type or U type; the steel strip is butt welded by using a stir friction welding method or the like, and after cooling, the weld is polished and cleaned; the side of the steel strip is planed into an I type bevel, and is formed by a UOE arranging roller; the steel strip is longitudinally welded by laser welding, and the continuous pipe is formed; the whole pipe body of the continuous pipe is heat treated, and is isothermal annealed by medium-frequency induction heating, and is heated first and then cooled; and the continuous pipe is wound on a winding drum by using a winding machine, and is continuously produced. By using the ion implantation+passivation treatment+heat treatment method on the designed plate, the continuous pipe manufactured by the plate has low cost, high strength, high plasticity and toughness, and high corrosion resistance.

The present invention provides a 1300MPa thick steel plate for pressure-bearing equipment, a manufacturing method, a forming method and a subsequent heat treatment method. The composition of the steel plate is as follows by weight percentage: C 0.19% to 0.23%, Si 0.10% to 0.40%, Mn 0.40% to 0.70%, P≤0.010%, S≤0.003%, Cr 1.40% to 2.0%, Mo 0.40% to 0.60%, B 0.001% to 0.005%, Alt 0.015% to 0.045%, and the balance is Fe and unavoidable inclusions. The manufacturing method includes smelting, continuous casting, heating, controlled rolling, controlled cooling and tempering; the steel after forming and heat treatment has a room temperature mechanical property of 950MPa≤R p0.2 ≤1100MPa, 1300MPa≤Rm≤1430MPa, elongation A≥19%; at 400℃, 560MPa≤Rp 0.2 ≤630MPa; impact energy KV2≥120J at 0℃; ensure the use requirements of high-strength pressure-bearing equipment.

The present application relates to a HRB500E earthquake-resistant steel bar and a preparation method thereof, belonging to the technical field of earthquake-resistant steel bar production. The chemical composition of the steel bar comprises: C: 0.20 wt%-0.25 wt%, Si: 0.50 wt%-0.75 wt%, Mn: 1.20 wt%-1.40 wt%, P: ≤0.030 wt%, S: ≤0.030 wt%, V: 0.05 wt%-0.08 wt%, Fe; the metallographic structure of the steel bar is: ferrite and pearlite. The preparation method of HRB500E earthquake-resistant steel bars provided in the present application eliminates the heating step of the heating furnace, and is optimized from the aspects of composition control, continuous casting billet drawing speed control, direct rolling insulation roller conveying control, start rolling temperature, finishing rolling entrance temperature, wire drawing temperature, air cooling process, roller speed, etc. The produced HRB500E earthquake-resistant steel bars have excellent organizational properties, mechanical properties, and earthquake-resistant properties, with performance parameters Rp0.2≥520Mpa, tensile strength Rm≥700Mpa, elongation≥18%, Agt≥9%, strength-to-yield ratio≥1.25, and yield-to-yield ratio≤1.2.

The invention discloses a preparation method of a magnesium alloy plate with a gradient twin structure, and belongs to the technical field of heterostructure material preparation. According to the method, firstly, a magnesium alloy plate serves as a base plate, magnesium alloy wires of the same mark are adopted for double-heat-source auxiliary heating stirring friction solid-phase additive manufacturing, and a deposition plate with crystal grains preferentially oriented in the thickness direction is obtained by regulating and controlling the heating temperature and deposition head process parameters; keeping the heating state of the substrate, performing heat source-assisted ultrasonic rolling on the deposited plate, and enabling crystal grains in the thickness direction of the plate to generate twinning deformation of different degrees by regulating and controlling rolling parameters; and finally, separating the substrate from the deposition plate to obtain the magnesium alloy plate with the gradient twin structure. Heterogeneous particles are not introduced, the material is pure, the technological process is short, the production efficiency is high, the cost is low, the prepared plate is small in grain, the gradient twin crystal structure penetrates through the thickness, the comprehensive performance is excellent, and the method is suitable for industrial production and can be applied to the fields of automobiles, aerospace, medical instruments and the like.

This invention provides an ultra-wide, extra-thick 1200 MPa grade steel for hydropower engineering and its preparation method, relating to the field of steel manufacturing technology for hydropower engineering. The steel composition is: C 0.12%~0.15%, Cr 0.45%~0.55%, Ni 1.80%~2.50%, Mo 0.40%~0.50%, Cu 0.20%~0.50%, Mn 0.6%~1.20%, Si 0.25%~0.45%, Alt 0.03%~0.08%, Ti 0.02%~0.05%, Nb 0.02%~0.05%, B 0.0015%~0.0018%, P≤0.006%, S≤0.002%, with the remainder being Fe and unavoidable impurities. The preparation method includes: smelting according to predetermined element mass percentages; LF-RH refining; continuous casting and controlled rolling; and conditioning treatment. This invention employs a segregation reinforcement strategy to address the insufficient core strength of extra-thick steel plates, significantly improving the uniformity of strength in the thickness direction. Through a modulation process, it produces ultra-wide, extra-thick 1200 MPa grade hydropower engineering steel. This ultra-wide, extra-thick 1200 MPa grade hydropower steel exhibits dimensions and mechanical properties better suited to the harsh application environments of current hydropower steel applications, representing the future trend in hydropower steel development.

This application relates to the field of alloy steel technology, specifically disclosing an ultra-high strength cast steel base for a high-speed railway permanent magnet traction motor and its preparation method. The ultra-high strength cast steel base for a high-speed railway permanent magnet traction motor is made from a chemical composition comprising the following weight percentages: C 0.15-0.25%, Si 0.2-0.5%, Mn 1.5-2.5%, Cr 0.5-1.25%, Ni 0.3-0.8%, Mo 0.2-0.5%, Al 0.02-0.06%, V 0.05-0.15%, Ti 0.02-0.08%, Nb 0.01-0.05%, P 0.01-0.02%, S 0.005-0.01%, with the balance being Fe. The ultra-high strength cast steel frame for the high-speed railway permanent magnet traction motor of this application achieves ultra-high strength while maintaining excellent plasticity and toughness and extremely high fatigue limit. This allows designers to use thinner and more optimized frame wall thickness while ensuring safety margin, thereby directly achieving the goal of lightweighting and enabling it to cope with the extreme vibration conditions of high-frequency and high-stress cycles of high-speed railway traction motors.

The invention discloses a quaternary precipitation strengthening iron-based high-entropy alloy and a preparation method thereof, the high-entropy alloy comprises the atomic components of Fe, Co, Ni and Al, and the atomic percentage of Fe to Co to Ni to Al is 48%-52%: 23%-27%: 17%-20%: 5%-8%. The preparation process comprises the following steps: preparing four elements of Fe, Co, Ni and Al with the purity higher than 99.95 wt% as alloy elements; the preparation method comprises the following steps: preparing and smelting an as-cast alloy by using a non-consumable vacuum arc melting furnace, then carrying out solid solution treatment by using a heat treatment furnace to obtain a solid solution alloy with a stable single phase, and then carrying out further heat treatment to obtain the high-toughness high-entropy alloy. The high-entropy alloy has fine granular or lamellar B2 phases which are uniformly separated out, precipitates are distributed on a matrix FCC (fluid catalytic cracking) to form precipitation strengthening, and the high-entropy alloy shows excellent comprehensive mechanical properties. Compared with a traditional high-entropy alloy, the high-strength and high-toughness iron-based high-entropy alloy prepared through the method has the excellent comprehensive mechanical property.

The invention discloses an in-situ multiphase toughened nickel-based alloy composite material and a preparation method thereof. The nickel-based alloy composite material comprises a nickel-based alloy matrix, in-situ strengthening phases WC and Al2O3 distributed on the nickel-based alloy matrix, and a toughening phase W2AlC. The preparation method comprises the following steps: (1) mixing WO3 powder and Al powder by ball milling to obtain a WO3 / Al mixed powder; (2) sputtering a carbon layer on the surface of the WO3 / Al mixed powder by an ion sputtering process to obtain a WO3 / Al mixed powder coated with the carbon layer; (3) mixing the WO3 / Al mixed powder coated with the carbon layer with a nickel-based alloy powder by ball milling to obtain a nickel-based alloy composite material powder; and (4) in an argon protection environment, using a selective laser melting process, using a high-energy laser beam to scan and shape the nickel-based alloy composite material powder, so that an in-situ reaction occurs between WO3 / Al / C to generate an in-situ strengthening phase WC and Al2O3 phase and a toughening phase W2AlC. The in-situ reinforcing phases WC and Al2O3 and the toughening phase W2AlC in the nickel-based alloy composite material of the present invention can effectively improve the strength, plasticity, toughness and mechanical processing performance of the composite material.

The method for preparing the gradient heterogeneous lamellar structure titanium alloy comprises the following steps that a titanium alloy plate blank is subjected to heat preservation at the temperature higher than the beta transformation temperature for at least 30 minutes, water cooling is conducted to the room temperature, and a first blank is obtained; the first blank is heated to 700-850 DEG C, heat preservation is conducted for at least 5 minutes, corrugated roller rolling is conducted, corrugated surfaces are formed on the upper end face and the lower end face of the plate, and a second blank is obtained; the second blank is heated to 650-800 DEG C and subjected to heat preservation for at least 5 minutes, multi-pass flat roller rolling is carried out to flatten the corrugated surface, and a third blank is obtained; and the surface of the third blank which is flattened through rolling is polished, shot blasting treatment is conducted on the polished end face, and the gradient heterogeneous lamellar structure titanium alloy is obtained. The product obtained by the method provided by the invention has the advantages of high tensile strength and better plasticity and toughness.

This invention discloses a low-carbon tin-containing free-machining steel and its production method. The weight percentage (wt%) of the chemical composition in the steel is: C 0.06-0.15, Si 0.10-0.30, Mn 1.50-1.80, S 0.40-0.60, P 0.06-0.10, Sn 0.30-0.50, Mn / S≥4.0, Sn / S≥0.80, O: 130-200ppm, with the remainder being iron and unavoidable impurities. This invention, through compositional design, controls Mn / S≥4.0 to improve the spindle morphology of sulfides, and Sn / S≥0.80 to achieve Sn aggregation near sulfides and grain boundaries, as well as aggregation and precipitation in other areas of the material matrix, which is more conducive to improving the material's machinability and reducing turning cracks. The Sn element is added using a combined addition technology of the tundish impact zone and the crystallizer nozzle, which improves the Sn yield.

The utility model discloses an offshore wind power foundation construction guide frame in the field of construction guide frames, which comprises a support, an X-shaped stabilizing frame is sequentially welded on the inner side of the support from top to bottom, the support comprises a steel plate base layer, a protective layer and a corrosion-resistant layer, the protective layer is arranged on the outer surface of the steel plate base layer, and the corrosion-resistant layer is arranged on the outer surface of the steel plate base layer. A corrosion-resistant layer is arranged on the outer surface of the protective layer and comprises a nickel-based alloy, an anti-rust primer layer and an epoxy anti-rust finish paint layer. According to the utility model, the bracket is stabilized through the X-shaped stabilizing frame, the stability of the bracket in use is improved, and the bracket has unique corrosion resistance and even high-temperature corrosion resistance through the arrangement of the protective layer, the corrosion-resistant alloy and the corrosion-resistant steel plate, and has the advantages of high strength, good plasticity and toughness, good corrosion resistance and the like. The aluminum alloy bracket has the properties of smelting, casting, cold and hot deformation, processing forming, welding and the like, is widely applied to the fields of petrifaction, energy, ocean, aerospace and the like, improves the corrosion resistance of the bracket and prolongs the service life of the bracket.

The present invention relates to an ultra-high strength steel for key equipment of a large hydropower station and a manufacturing method thereof. The chemical composition of the steel is C: 0.06%-0.11%; Si: 0.05%-0.095%; Mn: 0.60%-1.10%; P≤0.008%; S≤0.0015%; Ni: 0.66%-0.79%; Cr: 0.66%-0.80%; Mo: 0.71%-0.90%; V: 0.061%-0. 09%; N: 0.01% ~ 0.03%; Zr: 0.02% ~ 0.05%; Al: 0.02% ~ 0.045%; [O] ≤ 8ppm; [H] ≤ 1.5ppm, the balance is Fe and impurities; the integrated design of composition and manufacturing process ensures the uniform and stable performance of the steel plate; the produced steel plate has ultra-high strength, good plasticity, cold bending performance and welding performance; and the production process is short, the cost is low and the efficiency is high.

The present invention relates to the technical field of alloy preparation, and specifically discloses a method for preparing a nitride ceramic phase reaction precipitation strengthening high entropy alloy, which is specifically: urea and CoCrFeMnNi high entropy alloy powders of a certain mass ratio are ball-milled and mixed, and a nitride ceramic phase is precipitated by in-situ reaction by rapid hot pressing sintering, and Ar is introduced as a protective gas during the sintering process, and a nitride ceramic phase reaction precipitation strengthening high entropy alloy is obtained after hot pressing sintering. The nitride ceramic phase reaction precipitation strengthening high entropy alloy prepared by the present invention significantly improves the strength of the CoCrFeMnNi high entropy alloy and retains a relatively high plasticity, thereby improving the application potential of the alloy as a high-performance structural material under various complex working conditions.

This application discloses an ultra-high strength, lightweight Al-Ti-V-Cr medium-entropy alloy in the field of medium-entropy alloy materials technology. The alloy comprises, by mass percentage: Al: 24–28%; Ti: 45–50%; V: 10–14%; Cr: 10–14%; and the total content of impurity elements is ≤0.01%. This technical solution obtains a medium-entropy alloy by mixing the four elements in a certain proportion, giving it characteristics such as ultra-high strength, low density, high temperature resistance, and excellent hot workability.

This invention provides a quenching process for H13 alloy steel titanium die, including a heating stage and a cooling stage. The heating stage is characterized by heating the workpiece to 1000-1070°C using a stepped heating method. The cooling stage includes at least a cooling step of placing the workpiece in an air-cooled environment by rotating the workpiece to cool it down.

The invention provides an economical high-flange 900MPa-grade hot-rolled automobile beam steel plate and a production method, and belongs to the technical field of hot-rolled automobile beam steel manufacturing. The steel plate is prepared from chemical components in percentage by mass as follows: 0.04%-0.10% of C, 0.06%-0.15% of Si, 1.3%-1.8% of Mn, smaller than or equal to 0.005% of S, smaller than or equal to 0.008% of P, 0.010%-0.030% of Nb, 0.06%-0.10% of Ti, larger than or equal to 0.025% of Als, smaller than or equal to 40 ppm of N and the balance of Fe and inevitable impurities. The production method comprises the working procedures of smelting, continuous casting, heating, rough rolling, finish rolling, cooling and coiling. According to the invention, no expensive microalloy element Mo is added, the relative cost is relatively low, and by designing a reasonable controlled cooling process for different thickness specifications, good plasticity and toughness can be maintained while the strength of the steel plate is improved.

The invention discloses a method for recycling injection-molded bonded neodymium iron boron magnetic powder by removing organic matters in waste polyamide bonded neodymium iron boron magnetic powder through a potassium permanganate chemical reaction method, and relates to the technical field of material recycling. An adopted mixed solvent is composed of potassium permanganate, lauryl sodium sulfate, sodium hydroxide and deionized water, the concentration range of the potassium permanganate is 0.02-0.05 mol / L, the concentration range of the lauryl sodium sulfate is 0.01-0.03 mol / L, and the pH value of the solution is kept between 7 and 10 through the use amount of the sodium hydroxide. The method has the advantages that the pH value of the solution is adjusted through the potassium permanganate-sodium dodecyl sulfate (SDS) mixed solvent system and the alkaline medium, the solution formula and the treatment method which can effectively remove the polyamide binder in the waste injection molding type bonded neodymium iron boron magnetic powder and have small damage to the neodymium iron boron magnetic powder are provided, the recovery process is simple, operation is easy and convenient, and the method is suitable for industrial production. The safety is high, the cost is low, and the binder removal effect is remarkable.

This application provides a heterogeneous multi-interface ultrafine-grained high-entropy alloy composite coating and its preparation method. The preparation method includes: (1) cold spraying heterogeneous multi-interface ultrafine-grained high-entropy alloy composite powder onto the surface of a substrate to prepare an ultrafine-grained high-entropy alloy composite coating; (2) heat-treating the ultrafine-grained high-entropy alloy composite coating under a protective atmosphere to obtain a high-performance heterogeneous multi-interface ultrafine-grained high-entropy alloy composite coating; wherein, the heterogeneous multi-interface ultrafine-grained high-entropy alloy composite powder is a composite powder with a heterogeneous multi-interface structure in which high-entropy alloy / refractory metal heterogeneous phase boundaries and ultrafine grain boundaries coexist. This application constructs an ultrafine-grained composite powder with abundant heterogeneous multi-interfaces, and then uses cold spray solid deposition to completely preserve its fine structure, thereby obtaining a heterogeneous multi-interface ultrafine-grained high-entropy alloy composite coating material with ultra-high strength, good ductility and toughness, and multi-functional service characteristics.

The application discloses a kind of super-high-strength mining round-link chain steel and a preparation method thereof, and belongs to the technical field of round-link chain steel, solve the problem that the strength and toughness of round-link chain steel in prior art cannot be effectively improved simultaneously.The components of the super-high-strength mining round-link chain steel include, by mass percentage: C: 0.22% to 0.27%, Si: 0.10% to 0.17%, Mn: 0.48% to 0.62%, P: ≤0.015%, S: ≤0.005%, Cr: 0.41% to 0.66%, Ni: 0.88% to 1.23%, Mo: 0.87% to 1.13%, Cu: 0% to 0.60%, V: 0.18% to 0.36%, W: 0.21% to 0.45%, and the balance is Fe and unavoidable impurities.The super-high-strength mining round-link chain steel has high strength and good plasticity and toughness.

The invention discloses a cobalt-based material which is prepared from the following components in percentage by mass: 50.0%-60.0% of Cr, 5.0%-8.0% of Ni, 6.0%-8.0% of C, 8.0%-10.0% of Mo, 2.0%-4.0% of W, 0.5%-0.8% of Mn, 2.5%-3.5% of Si and the balance of Fe, and the sum of the mass percentages of the components is 100%. The invention further discloses a preparation method of the cobalt-based material. The preparation method comprises the following steps: weighing the cobalt-based material, drying and mixing; the invention further discloses a welding wire based on the cobalt-base-containing material. The cobalt-base-containing material is wrapped by the welding skin. The preparation method comprises the following steps: removing grease from alcohol, wrapping the cobalt-based material to obtain a core roll, putting the core roll into a drawing mold, and drawing to obtain the welding wire based on the cobalt-based material; the problem that in the prior art, a water cooling wall tube material is poor in high-temperature corrosion resistance, and safety accidents are prone to occurring is solved.

The invention discloses a double-frequency induction quenching heat treatment method for a large-diameter GCr15SiMn core mold. The double-frequency induction quenching heat treatment method comprises the steps that S1, two inductors are installed on two quenching transformers correspondingly, and a water spraying ring is installed below the inductors; s2, the core mold is hung on a double-frequency quenching machine tool, and the lower end face of the core mold is placed in a power frequency inductor; s3, setting power frequency initial power, intermediate frequency initial power, core mold downward moving speed and autorotation speed; s4, the power frequency inductor and the medium-frequency inductor heat the core mold in sequence, finally, the core mold is moved out of the medium-frequency inductor and then cooled, and a quenched core mold is obtained; and S5, the quenched core mold is tempered, air cooling is conducted to the room temperature after tempering is finished, inspection is conducted, and the double-frequency induction quenching heat treatment on the core mold is completed. According to the double-frequency induction quenching heat treatment method for the large-diameter GCr15SiMn core mold, the problems that the hardness of an inner hole and a wall thickness part is too high and the overall plasticity and toughness of the core mold cannot be guaranteed in an overall quenching method are solved.

The invention provides a hot-rolled corrosion-resistant steel plate and a manufacturing method thereof. The steel plate comprises the following components: C: 0.015%-0.050%, Si: 0.15%-0.35%, Mn: 0.60%-0.90%, P: ≤0.015%, S: ≤0.0020%, Cr: 2.0%-3.5%, Ni: ≤0.10%, Cu: 0.15%-0.30%, Als: 0.015%-0.035%, Ca: 0.0010%-0.0035%, N≤0.0050%, H≤1.5ppm, and the remainder is Fe and unavoidable impurity elements; the weathering index I≥8.0; 1≤Ca / S≤5; compared with the prior art, the steel plate developed by the invention has excellent atmospheric corrosion resistance and H2S corrosion resistance through the coordinated design of alloy components and the whole-process manufacturing process of smelting, continuous casting, controlled rolling and controlled cooling.