16results about How to "Fine grain" patented technology

This invention relates to a method for preparing high-performance aluminum alloy radiator plates. The method involves controlling the iron-silicon ratio of the main impurity component in the melt to be no less than 1.9 to reduce internal cracks in the cast billet and decrease the machining deformation rate of the finished product. This is achieved by adding aluminum-titanium alloy and a grain refiner in the furnace and online runner, while ensuring that the titanium content in the aluminum alloy ingot is maintained within a reasonable range, resulting in an ingot grain size ≤1. This improves the mechanical properties, uniform microstructure, and refined grains of the aluminum alloy radiator plate. Simultaneously, a small amount of copper is added, and the final rolling temperature is controlled at 330-360℃, resulting in fully recrystallized grains within the aluminum alloy plate. This improves the strength of the aluminum alloy radiator plate while eliminating anisotropy in its internal mechanical properties and reducing internal stress, ultimately yielding a high-performance aluminum alloy radiator plate.

The invention provides a collaborative optimization method for a magnetic-thermal composite field assisted laser cladding process. According to the method, a magnetic-thermal composite field-assisted laser cladding device is designed based on an energy field-assisted laser cladding process principle and is used for improving the structure and performance of a coating; the method comprises the following steps: generating a quadratic polynomial regression model on the basis of an RSM method, magnetic-thermal composite field assisted laser cladding process parameters and nickel-based composite coating quality evaluation indexes, performing multi-target optimization on the coating quality evaluation indexes on the basis of the quadratic polynomial regression model and an IMOGWO algorithm, determining a magnetic-thermal composite field assisted laser cladding target process parameter combination, and determining the quality of the nickel-based composite coating. And score calculation is carried out on the target process parameter combination based on an EWM-TOPSIS method to obtain a comprehensive evaluation sequence of the target process parameter combination, so that collaborative optimization of the magnetic-thermal composite field assisted laser cladding process is realized, and the performance optimization efficiency and quality of the nickel-based composite coating are improved.

This invention discloses a high-performance corrosion-resistant non-magnetic stainless steel and its preparation method, belonging to the technical field of stainless steel materials. It solves the problems of existing non-magnetic stainless steels where the mechanical properties and corrosion resistance cannot be simultaneously and effectively improved, and the microstructure uniformity is poor. The high-performance corrosion-resistant non-magnetic stainless steel comprises, by mass percentage: 18.30% ≤ Cr < 21.00%, 2.60% ≤ Mo ≤ 3.00%, 4.10% ≤ Ni ≤ 4.50%, 20.50% < Mn ≤ 22.00%, Si ≤ 0.4%, 0.015% < Nb ≤ 0.03%, P ≤ 0.025%, S ≤ 0.01%, C ≤ 0.02%, 0.80% < N ≤ 0.85%, with the balance being Fe and other unavoidable impurities. The high-performance corrosion-resistant non-magnetic stainless steel of this invention has fine and uniform grains, and excellent mechanical properties and stress corrosion resistance.

This invention relates to the field of welding technology, specifically to a method for strengthening the heat-affected zone (HAZ) of thick low-carbon, low-alloy ship steel plates that withstand high heat input welding; more specifically, it relates to a method for strengthening the HAZ of thick low-carbon, low-alloy ship steel plates that withstand high heat input welding and its application. This invention uses a first flux as a printing material, which is melted onto the surface of a steel substrate via arc printing to obtain a steel billet. The first flux is mainly composed of CaF2, SiO2, MnO, and TiO2 in a mass ratio of 25–32:25–32:25–32:4–25. The steel billet is then rolled and welded. This method has advantages such as simple operation, low cost, short time consumption, and high production efficiency. Furthermore, the steel heat-affected zone prepared by this method has a large number of fine, dispersed inclusions and fine grains, greatly improving the mechanical properties of the heat-affected zone.

This invention discloses a stress corrosion resistant non-magnetic stainless steel and its preparation method, belonging to the technical field of stainless steel materials. It solves one of the problems in existing technologies: the microstructure uniformity of non-magnetic stainless steel is difficult to control, and the mechanical properties and stress corrosion resistance of existing non-magnetic stainless steel cannot be simultaneously and effectively improved. The composition of the stress corrosion resistant non-magnetic stainless steel, by mass percentage, includes: 18.30% ≤ Cr < 21.00%, 1.10% ≤ Mo ≤ 1.40%, 2.60% ≤ Ni ≤ 3.0%, 20.50% < Mn ≤ 22.00%, Si ≤ 0.4%, 0.01% ≤ Nb ≤ 0.015%, P ≤ 0.025%, S ≤ 0.01%, C ≤ 0.02%, 0.76% ≤ N ≤ 0.80%, with the balance being Fe and other unavoidable impurities. The stress corrosion resistant non-magnetic stainless steel of this invention has fine and uniform grains, and excellent mechanical properties and stress corrosion resistance.

This application relates to the field of metal material processing technology, and discloses a titanium-steel composite plate, its preparation method, and a ship. The titanium-steel composite plate includes a steel substrate layer, a pure titanium cladding layer, and an alloy layer, wherein the alloy layer is disposed between the steel substrate layer and the pure titanium cladding layer; wherein the alloy layer includes a Fe-intermediate element-Ti ternary alloy layer, and the Fe-intermediate element-Ti ternary alloy layer satisfies the following conditions along the direction from the steel substrate layer to the pure titanium cladding layer: the Fe content gradually decreases, the Ti content gradually increases, and the content of the intermediate element first gradually increases and then gradually decreases; the intermediate element is a transition element in the Fe-Ti system. This composite plate exhibits excellent interface quality, as well as excellent structural stability and corrosion resistance.

The application discloses a kind of high-performance magnesium-lithium alloy materials, the high-performance magnesium-lithium alloy material is obtained by being compacted by magnesium-lithium alloy powder into mould, then sintering densification is carried out, in addition, the application also provides a kind of preparation method of high-performance magnesium-lithium alloy material, comprising the following steps: one, Mg-8Li-9Al-1Zn alloy powder is weighed and loaded into mould;Two, the powder in the powder loaded mould is compacted;Three, the mould with compacted powder is sintered densification in vacuum, and high-performance magnesium-lithium alloy material is obtained in mould.The high-performance magnesium-lithium alloy material of the application uses Mg-8Li-9Al-1Zn alloy powder as raw material, is compacted by being loaded into mould, then sintering densification is carried out, process flow is short, cost is low, operation is simple, flexible, the obtained high-performance magnesium-lithium alloy material component is uniform, organization is small, and the organization, structure of material can be designed, easily controlled, and the compressive strength is greater than 500MPa.

The utility model relates to a PVC insulation material extruding mechanism, include: drive mechanism, including drive motor, first pulley, second pulley, transmission belt, speed reducer, first pulley is installed on drive motor is used to drive first pulley rotation, second pulley is installed on speed reducer, transmission belt will first pulley with second pulley is connected, so that drive motor drives second pulley rotation, extruding rod, including rotary rod, spiral cutting edge, flow cone, spiral cutting edge sets up on rotary rod, one end of rotary rod with speed reducer is connected, so that rotary rod rotation, flow cone sets up in the other end of rotary rod, and feed hopper, transfer case, outer sleeve, feed hopper with transfer case intercommunication, and at least a part of extruding rod passes transfer case, outer sleeve is set up on extruding rod, and extruding rod can rotate in transfer case, outer sleeve.

The application discloses a semi-solid thixotropic die casting forming method of a narrow solid-liquid two-phase zone alloy, and comprises the following steps: step one: the narrow solid-liquid two-phase zone alloy is added into a heating device and heated to a superheating temperature, and after complete melting, the alloy is cooled for a certain time to obtain an alloy blank with a cast structure; step two: the alloy blank is added into an extrusion device to complete cold extrusion, and an alloy blank containing high-density dislocations and lattice distortion structures is obtained; step three: the alloy blank is heated for the first time, the heating temperature is set between a recrystallization temperature and a solidus temperature of the alloy, and isothermal heat treatment is carried out to obtain fine and uniform recrystallized grains; step four: the alloy blank is heated for the second time, the temperature is set above the solidus temperature of the narrow solid-liquid two-phase zone alloy, and isothermal heat treatment is carried out to obtain a semi-solid blank; and step five: the semi-solid blank is subjected to die casting forming. The application has the advantages that excellent castings with physical properties are formed.

The application discloses an alloy steel cutter material and a preparation method thereof. The alloy steel cutter material is composed of at least two kinds of heterogeneous steel powder, including high-carbon high-chromium alloy steel powder and medium-carbon stainless steel powder. The high-carbon high-chromium alloy steel powder contains 0.95-1.10 wt% of C, 13-15 wt% of Cr and 3-5 wt% of Mo, and the medium-carbon stainless steel powder contains 0.45-0.75 wt% of C and 12-14 wt% of Cr. The average particle size D50 of the powder is 50-80 mu m, and the microstructure of the alloy steel cutter material includes ferrite and / or martensite matrix, and also includes dispersedly distributed carbide. The alloy steel cutter material can realize continuous and clear patterns, high light-dark contrast, high hardness, high sharpness, high durability and excellent corrosion resistance.

This invention discloses a high-performance corrosion-resistant non-magnetic drill collar and its manufacturing method, belonging to the field of stainless steel material technology. It solves the problems of poor microstructure uniformity and the inability to simultaneously and effectively improve mechanical properties and stress corrosion resistance in existing non-magnetic drill collars. The manufacturing method includes: melting steel; preparing ingots; forging the ingots into steel billets using a high-speed forging mill after they are removed from the furnace; heating and holding the steel billets; forging the steel billets into intermediate billets using a radial forging mill; water-cooling the intermediate billets; performing secondary forging of the water-cooled intermediate billets using a radial forging mill, followed by air cooling to obtain finished steel billets; straightening, drilling, reaming, boring, internal controlled rolling, and shot peening of the finished steel billets to obtain the high-performance corrosion-resistant non-magnetic drill collar. The high-performance corrosion-resistant non-magnetic drill collar of this invention has fine and uniform grains and excellent mechanical and corrosion resistance.

This invention provides a multi-stage crushing device for the recycling of waste plastics, relating to the field of waste plastic recycling technology. It includes: a main body; a feeding hopper mounted on the top surface of the main body, and a crushing roller and linkage rod assembly installed inside the main body; a crushing control box mounted on the top surface of the main body; a bottom box mounted at the bottom of the crushing control box, and a crushing chamber installed inside the bottom box; a fixed side plate on the left side of the crushing chamber, an arc-shaped screen plate inside the crushing chamber, a crushing shaft with crushing blades mounted below the arc-shaped screen plate, and a rotatable feeding plate mounted at the bottom of the crushing chamber. In use, the plastic parts to be crushed are fed between the interlocking plates, and the plastic is crushed sequentially by the interlocking plates, the crushing roller, and the crushing shaft. The crushed plastic fragments achieve a more uniform particle size, overcoming the limitation of single-stage crushing in achieving uniform particle size.

This invention discloses a boron-doped vanadium diboride-based multiphase ceramic and its high-pressure, high-temperature preparation method. The ceramic consists of vanadium diboride and a boron-doped phase, with a boron doping amount of 15–50 vol%, preferably 50 vol%. The preparation method involves weighing VB2 powder and boron powder according to a specified ratio, ball-milling them together, pressing them into a blank, and then sintering under high pressure and high temperature (1000–2000℃) for 60–180 minutes. This invention, through the synergistic effect of controllable excess boron doping and high-pressure, high-temperature sintering, allows excess boron to form a nanoscale second phase in situ at the VB2 grain boundaries, inducing high-angle, multi-level crack deflection and promoting grain pull-out, thus significantly improving fracture toughness while maintaining high hardness. The obtained 50 vol% boron-doped multiphase ceramic exhibits a Vickers hardness of 21.27 ± 1.11 GPa and a fracture toughness of 9.41 ± 0.58 MPa·m. 1 / 2 This method achieves approximately 135% improvement in hardness and toughness compared to pure VB2 ceramics, realizing a synergistic enhancement of both. The process is simple, requires no additional sintering aids, and is suitable for preparing high-strength, high-toughness ultra-high temperature ceramic components.

The present application relates to a kind of thin-walled high rib ring cylinder multi-degree-of-freedom radial envelope forming equipment, including head, drive component, movement component, column, workbench, main shaft component, workpiece shaft component and base;Drive component includes servo motor, planetary reducer, reversing gear box, servo cylinder, push rod, pressure sensor, left slider, middle slider, right slider, wear-resistant inclined plate, wear-resistant bottom plate, wear-resistant inclined block, wear-resistant bottom block and grating ruler;Movement component includes outer ball seat, inner ball seat, ball cover, inner ball head connecting rod and outer ball head connecting rod;Main shaft component is suspendedly installed on workbench, and main shaft component includes main shaft motor, main shaft box, core roller, copper sleeve, main shaft support cover, main shaft support seat, main shaft, main shaft key and main shaft encoder;Workpiece shaft component is installed on base, including workpiece shaft mounting plate, workpiece, workpiece shaft, workpiece box, workpiece motor and workpiece magnetic grid.The present application can realize thin-walled high rib ring cylinder high-performance high-efficiency forming manufacturing.

The present application relates to the technical field of stainless steel, in particular to a 0Cr15Ni5Cu4Nb stainless steel and a preparation method of a rod thereof; the chemical components include: C: 0.03%-0.05%, Cr: 14.0-15.5%, Ni: 3.5-5.5%, Cu: 2.5-4.5%, Nb: 5 times of the content of C-0.45%, Si≤1.00%, Mn≤1.00%, S≤0.005%, P≤0.010%, O≤0.002%, N≤0.001%, and the balance of Fe. The preparation method is realized based on the above chemical components. The present application cooperatively optimizes the deformation amount and the terminal temperature in the last forging process, so that the precipitation strengthening phase (such as copper-rich phase) is more fine and dispersedly distributed, the precipitation strengthening effect is improved, and the more fine grains are obtained, which is helpful to improve the strength and toughness of the material.

This invention relates to the fields of air pollution control and solid waste disposal in advanced environmental protection industries, and particularly to a carbon monoxide catalytic combustion catalyst and its preparation method. The preparation method of the carbon monoxide catalytic combustion catalyst includes: Step A, crushing waste copper-based methanol synthesis catalyst to obtain a first powder; Step B, calcining the first powder; Step C, washing and filtering the calcined first powder to obtain a filter cake material; Step D, drying and crushing the filter cake material to obtain a second powder; Step E, adding a molding aid to the second powder and kneading to obtain a semi-finished product; Step F, molding the semi-finished product, and then drying and calcining it to obtain the carbon monoxide catalytic combustion catalyst. This invention turns waste into treasure, utilizing waste methanol synthesis catalyst to obtain a carbon monoxide catalytic combustion catalyst, and has good prospects for widespread application.