18results about How to "Fine grain structure" patented technology

The invention discloses a heat treatment-free die-casting aluminum alloy for a structural part. The heat treatment-free die-casting aluminum alloy comprises the following components in percentage by mass: 7.5%-11.5% of Si, less than or equal to 0.2% of Fe, 0.6%-1.2% of Mg, 0.05%-0.8% of Mn, 0.05%-0.4% of Cr, 0.03%-0.3% of Ta, 0.03%-0.3% of Nb, 0.03%-0.3% of Ni, 0.01%-0.12% of Ti, 0.03%-0.6% of Y, 0.03%-0.6% of Ce, 0.03%-0.6% of Er, 0.005%-0.05% of Sr and the balance of aluminum. The preparation method comprises the following steps: mixing and smelting an aluminum ingot, metal silicon, an aluminum-manganese intermediate alloy, an aluminum-chromium intermediate alloy, an aluminum-tantalum intermediate alloy, an aluminum-niobium intermediate alloy, an aluminum-nickel intermediate alloy, an aluminum-titanium intermediate alloy, an aluminum-yttrium intermediate alloy, an aluminum-cerium intermediate alloy and an aluminum-erbium intermediate alloy to obtain a melt I; adding a magnesium ingot into the melt I, smelting, introducing argon, refining to obtain molten aluminum, and casting to obtain an aluminum alloy ingot. The method is suitable for high-pressure casting forming to prepare force-bearing structural parts with complex shapes, can have good mechanical properties without heat treatment, and can be used for production of various parts required by new energy automobiles.

The invention discloses a preparation method of a tungsten-nickel target material for electrochromic intelligent glass, and relates to the technical field of tungsten-nickel target materials, and the preparation method comprises the following preparation steps: uniformly mixing N powder and W powder to obtain W-N mixed powder; the W-N mixed powder is put into a graphite mold to be flatly laid; putting the graphite grinding tool filled with the W-Ni mixed powder into a vacuum hot-pressing sintering furnace, firstly increasing the pressure to 6-10MPa, maintaining the pressure for 10-15min, and then releasing the pressure; the method comprises the following steps: vacuumizing a vacuum hot-pressing sintering furnace to below 5Pa, then carrying out three-stage heating to 1250-1300 DEG C, carrying out heat preservation for 30-60 minutes after heating is finished, then carrying out two-stage pressurization to 35-40 MPa, carrying out heat preservation and pressure preservation for 90-150 minutes, and then cooling to 100-200 DEG C along with the furnace to obtain a WNi alloy target blank; the temperature field is uniform through three-section heating, radial shrinkage is inhibited through pressure supplement, and finally, uniform and fine grain structures are obtained while the density of the target material is improved through a two-section pressurizing mode.

The invention relates to the technical field of bolt production, and particularly discloses a high-strength bolt machining process and device. Comprising the following steps: S1, material selection: selecting an alloy steel blank containing C, Si, Mn, Cr, Mo, V and the balance of Fe; s2, cold heading forming is conducted, specifically, the alloy steel blank is placed in a multi-station cold heading machine, and a bolt blank is formed through continuous cold heading and forging; s3, heat treatment is conducted, specifically, the bolt blank is subjected to quenching treatment and then subjected to tempering treatment, and a bolt base body is obtained; and S4, surface treatment is conducted, specifically, phosphating treatment is conducted on the surface of the bolt base body in sequence to form a phosphating layer, the composite coating is coated, and the high-strength bolt is obtained. The high-strength bolt machining process can be used for manufacturing connecting components requiring high reliability under complex working conditions such as heavy load, vibration and impact, and the high-strength bolt machining process has the advantages that the toughness, fatigue resistance and delayed fracture resistance are improved while high strength is kept.

The application relates to the technical field of electroplating, and discloses a chromium electroplating process for improving the hardness of a connector terminal, which comprises the following steps: performing surface pretreatment on the connector terminal, removing surface impurities through ultrasonic cleaning and micro-etching treatment; performing heating treatment on the connector terminal; performing electroplating treatment on the connector terminal by using an electroplating solution comprising trivalent chromium salt, boron nitride nanoparticles, ferroferric oxide nanoparticles, nickel ions, sodium dichromate and chromium alloy additives, so as to form a chromium plating layer; performing passivation treatment on the plating layer; performing low-temperature treatment on the plating layer; and spraying a protective layer on the chromium plating layer. Through the trivalent chromium salt and the sodium dichromate, the trivalent chromium salt is used to reduce hexavalent chromium ions into trivalent chromium, the toxicity of the hexavalent chromium is reduced, the sodium dichromate is used to provide a stable chromium source, the deposition of chromium elements in the electroplating process is ensured, the pollution of hexavalent chromium to the environment and the harm of hexavalent chromium to the health of operators are solved, and the environmental protection and safety of the electroplating process are improved.

The application discloses a method for improving notch sensitivity of a GH2909 alloy forge piece and the GH2909 alloy forge piece, and comprises the following steps: S1, selecting a rod-shaped blank to be heated for the first time and kept warm; S2, heating the rod-shaped blank in S1 for the second time and keeping warm; S3, placing the rod-shaped blank in S2, which reaches the keeping-warm time, into a forging equipment to be forged into a shape; S4, rapidly cooling the forge piece obtained in S3; S5, performing surface defect treatment on the cooled forge piece; and S6, performing aging heat treatment on the forge piece after the surface defect treatment. The GH2909 forge piece produced by the method has no persistent notch sensitivity problem, and a forge piece with qualified structure and mechanical properties can be obtained.

A 6000 series aluminum alloy medium and thick plate for spinning rims, the aluminum alloy raw material is composed of the following components in weight percentage: Si=0.45~0.75, Fe<0.65, Cu=0.25~0.35, Mn<0.10, Mg=0.95~1.15, Cr=0.15~0.30, Zn<0.20, Ti<0.10, the remainder is Al and inevitable impurities. The preparation process adopts precision heat treatment and rolling control technology to achieve the fine second phase and grain structure of aluminum from ingot to plate and strip. The finished aluminum alloy plate is 6~8mm thick, the grain size is ≤50μm, the second phase size is ≤10μm, the tensile strength is ≥100MPa, the yield strength is 35~90MPa, the elongation is ≥30%, and the rim surface prepared by spinning forming has no orange peel problem, which can better meet the technical requirements of aluminum for rims.

The invention provides a cyanide-free electrolyte for hard gold electroforming and a preparation process of the cyanide-free electrolyte, and belongs to the technical field of gold plating processes. The preparation process comprises the following steps: adding 4-dimethylaminopyridine for reaction to prepare an additive A; adding lithium tert-butoxide for reaction to prepare an additive B; preparing an AuCl3 solution; 5, 5-dimethyl hydantoin is dissolved, and all the components are added. The preparation method comprises the following steps: stirring and mixing N-acetyl-L-cysteine, triphenyl methanol and dichloromethane, mixing trifluoroacetic acid, performing reduced pressure distillation, purification and elution, then adding triethylamine, 4-dimethylaminopyridine and acetic anhydride for reaction, and adding trifluoroacetic acid and triethyl silane for reaction to prepare an additive A; after being added into a cyanide-free electrolyte, in the process of electroplating a gold layer, the gold plating solution can effectively promote the formation of crystal nucleuses, prevent the overgrowth of crystal grains and promote the refinement of gold crystal grains, and the fine and uniformly distributed crystal grain structure can remarkably improve the hardness and wear resistance of the plating layer.

The invention relates to the technical field of forming machining of non-ferrous metal thin strips, in particular to a machining method of a special-shaped high-conductivity Cu-Fe-P alloy plate strip. By optimizing the element ratio of the Cu-Fe-P series alloy, the conductivity of the Cu-Fe-P series alloy is improved. The special-shaped high-conductivity Cu-Fe-P alloy plate strip is prepared through the working procedures of smelting, semi-continuous casting, homogenizing annealing and hot rolling cogging, solution treatment, primary cold rolling deformation, primary aging treatment, secondary cold rolling deformation, secondary aging treatment, surface treatment, precision mechanical forming machining and the like. According to the special-shaped high-conductivity Cu-Fe-P alloy plate strip and the preparation method thereof, the multi-pass cold rolling deformation and the multi-stage aging treatment process are combined, a fine and uniform grain structure and a stable precipitated phase are obtained, the prepared special-shaped Cu-Fe-P alloy plate strip still has high hardness while high conductivity is kept, and the special-shaped high-conductivity Cu-Fe-P alloy plate strip product is obtained through precision mechanical forming machining.

The invention relates to the technical field of laminar cooling regulation, and provides a laminar cooling regulation electric arc additive dual-phase steel preparation device and system.The laminar cooling regulation electric arc additive dual-phase steel preparation device comprises a sealing outer plate, a connecting door plate is installed on the outer side wall of the sealing outer plate, a fixed base is fixedly connected to the inner side wall of the sealing outer plate, and a connecting sliding rail is installed at the top of the fixed base; a transverse rail is slidably connected to the top of the connecting sliding rail, a supporting plate is slidably connected to the top of the transverse rail, and a connecting base is installed on one side of the top end of the connecting sliding rail; by introducing a more efficient cooling medium, such as liquid nitrogen or special cooling liquid, the cooling speed can be remarkably increased, and heat in the material adding process can be quickly and uniformly dissipated. The efficient cooling mode not only shortens the cooling time, but also greatly reduces the phenomena of stress concentration and grain coarsening in the material caused by overlarge temperature gradient, thereby being beneficial to forming a finer and more uniform grain structure and improving the overall performance of the material.

The invention discloses a laser cladding technology-based Al-Si coating hot forming steel connecting method. According to the method, a high-energy laser beam is used for melting materials and welding base metal to form a high-quality welding seam. The laser cladding technology is used for connection of the aluminum-silicon coating hot forming steel plates, the concept that welding wires are replaced with powder is achieved, and compared with the welding wires, the laser cladding technology has the advantages that the powder replacement cost is lower, the welding line grain structure is in a fine isometric crystal shape, the heat affected zone is smaller, experiments are more convenient to conduct, and design components are more diversified. When the laser cladding technology is adopted, the ratio of the delta-ferrite content to the powder is balanced compared with the ratio of the delta-ferrite content to the wire material in a weld joint when the laser filler wire welding technology is adopted, so that a welded joint has good tensile property.

The invention discloses a method for vacuum horizontal continuous casting of a copper-titanium alloy, and relates to the technical field of copper-titanium alloy preparation. Comprising the following steps that powder mixing, pressing, vacuum sintering and vacuum self-consuming electric arc smelting are sequentially conducted through the powder metallurgy technology according to the proportion that the content of Ti ranges from 40 wt% to 60 wt% and the balance Cu, and a copper-titanium master alloy is prepared; the vacuum sintering temperature is 500-900 DEG C; the preparation method comprises the following steps: proportioning 2-6wt% of Ti and the balance of Cu, adding Ti in the form of a copper-titanium master alloy, heating and melting the raw materials through a vacuum induction melting process, and refining to obtain a melt; the refining temperature ranges from 1260 DEG C to 1300 DEG C; and the melt is flatly guided and injected into a crystallizer with the corresponding guiding and pulling size through a vacuum horizontal continuous casting technology, the guiding and pulling speed is controlled to be smaller than or equal to 600 mm / min, continuous casting is conducted, and after cooling, a copper-titanium alloy casting blank is obtained. The horizontal continuous casting process is adopted to produce bar and plate profile raw materials, and the obtained copper-titanium alloy casting blank is fine and uniform in grain structure, good in plasticity and convenient for subsequent deformation processing.

The invention discloses preparation of a high-strength, high-toughness and high-elongation TZM thick plate, and relates to the technical field of alloy preparation. The method comprises the steps that preparation raw materials are obtained, and the preparation raw materials comprise Mo powder, TiH2 powder, ZrH2 powder and C powder; the preparation method comprises the following steps: crushing and grinding TiH2 powder and ZrH2 powder, and sieving to obtain sieved TiH2 powder and sieved ZrH2 powder; the TZM powder is weighed according to the chemical component proportion and mixed, 0.5% of the sieved TiH2 powder is added in batches in the mixing process, and mixed powder is obtained; performing compression molding on the mixed powder to obtain a TZM powder blank; carrying out hot pressing sintering on the TZM powder blank to obtain a TZM blank; and the TZM blank is rolled and annealed to obtain the TZM thick plate. According to the embodiment of the invention, the high-strength and high-toughness TZM thick plate is prepared through the preparation steps of staged hot pressed sintering and star-shaped rolling, and the high elongation of the TZM thick plate is realized by optimizing the preparation and rolling annealing processes of the mixed powder.

The invention provides a preparation method of MoTi alloy, and belongs to the technical field of alloy. According to the preparation method, the Ti powder and the Mo powder are mixed and then subjected to sheathing assembly, degassing and hot isostatic pressing sintering to prepare the MoTi alloy target material, and compared with a traditional hot pressing sintering method, the obtained MoTi alloy is high in density, free of defects such as air holes and cracks in the internal structure, uniform and fine in grain structure, good in conductivity and excellent in sputtering performance; the method is suitable for preparing films in solar cells, photoelectric devices, semiconductor devices and the like.

The invention discloses a preparation method of copper-titanium alloy chopsticks, and relates to the technical field of non-ferrous metal alloys. Comprising the following steps: uniformly mixing raw materials to obtain mixed powder; the mixed powder is pressed into a consumable electrode bar, and a bar material is obtained; the bar is subjected to vacuum sintering at the temperature of 500-900 DEG C and then subjected to vacuum consumable electric arc melting, the melting current ranges from 1.5 KA to 3.0 KA, the melting voltage ranges from 18 V to 25 V, and a cast ingot is obtained; the cast ingot is forged, the final forging temperature is controlled to be not lower than 700 DEG C, and a round bar is obtained; the round bar is subjected to hot rolling treatment at the temperature of 830-900 DEG C, and a hot-rolled round bar is obtained; and carrying out solution treatment and aging treatment on the hot-rolled round rod, and then carrying out post-processing to obtain the finished copper-titanium alloy chopsticks. The copper-titanium alloy chopsticks have good mechanical properties, can reduce damage caused by collision in the use process of the chopsticks, and have obvious sterilization and bacteriostasis effects at the same time, so that the safe use performance of the chopsticks is improved.

According to the extrusion die and method for controlling the grain size of the 6-series aluminum alloy mobile phone plate, by means of the die pressurization method, grain crushing is more thorough in the casting rod extrusion process, then a finer grain structure is obtained, the product discharging temperature is increased in the die pressurization mode, the product quenching effect is improved, and the product quality is improved. Compared with a traditional flat-die-like die, the grain size of the mobile phone plate profile is reduced by 35%-45%, the expectation that the average grain size is smaller than 150 micrometers is achieved, and the product strength and oxidation performance are more stable and excellent.

This invention discloses a metal alloy nut and its preparation method. The nut is composed of the following components by mass percentage: Cr 20.0-23.0%, Mo 8.0-10.0%, Fe≤5.0%, Nb 3.15-4.15%, Ti 0.4-1.0%, Al 0.4-0.8%, Co≤1.0%, C≤0.08%, Si≤0.5%, Mn≤0.5%, P≤0.015%, S≤0.010%, with the balance being Ni. Its internal thread has a 30° wedge-shaped anti-loosening structure, and the thread surface has a Ni-P coating and a MoS2 lubricating layer. Annular stress relief grooves are provided on both end faces. The preparation method includes: powder metallurgy billet preparation, hot forging near-net-shape forming, gradient heat treatment, precision machining, and surface functionalization treatment. This invention achieves a nut with a tensile strength of ≥800MPa at 650℃, a room temperature tensile strength of ≥1200MPa, an elongation of ≥15%, and a material utilization rate of ≥85% through the synergistic control of alloy composition and gradient heat treatment. It is suitable for extreme environments such as aero engines and nuclear reactors.

The invention discloses a titanium-aluminum alloy target as well as a preparation method and application thereof, and belongs to the technical field of alloy targets. According to the titanium-aluminum alloy target material, a titanium-aluminum alloy residual target is placed on a mixed powder layer formed by pre-mixed titanium powder and pre-mixed aluminum powder, then the pre-mixed titanium powder and pre-mixed aluminum powder are laid on a sheath, then sheath welding and degassing are carried out, and hot isostatic pressing treatment is carried out under the specific temperature and pressure range; the waste titanium-aluminum alloy residual target can be fully utilized, the preparation cost of the titanium-aluminum alloy residual target is reduced, and the resource utilization rate is increased; in addition, the titanium-aluminum alloy target material prepared by adopting the technical scheme is high in purity, high in density, high in target material flatness and uniform and fine in grain structure.

The invention discloses a preparation method of a high-purity aluminum target material, and belongs to the technical field of high-purity aluminum target materials, in the preparation method, a trace amount of cerium atoms are doped through vacuum melting and used as a grain refiner, formation of fine and uniformly-distributed grains is facilitated, and the welding performance of the high-purity aluminum target material is improved; and then through three times of annealing, hot rolling and cold rolling treatment, the obtained high-purity aluminum target material has fine and evenly-distributed grain structures, and the high-purity aluminum target material with the larger size can be obtained. After cold rolling treatment, modified slurry is sprayed on the surface of the high-purity aluminum target material, tetrapod-like zinc oxide whiskers in the modified slurry can improve the mechanical property of the high-purity aluminum target material, and a reinforced network layer is formed on the surface of the high-purity aluminum target material by utilizing the special structural characteristics of the tetrapod-like zinc oxide whiskers; and the mechanical property and the oxidation resistance of the high-purity aluminum target material can be further improved.