41results about How to "Less metallurgical defects" patented technology

The invention discloses an aluminum alloy semi-ring for a fairing of a launch vehicle and a preparation method thereof, relating to an alloy semi-ring and a preparation method thereof. The invention solves a problem that the traditional aluminum alloy semi-ring for the fairing of the launch vehicle has a low intensity and cannot satisfy the application requirements of large-scale launch vehicles. The aluminum alloy semi-ring for a fairing of a launch vehicle is made of Si, Fe, Cu, Mn, Mg, Ni, Zn, Ti and Al. The tensile strength of the semi-ring is 380-450MPa, the percentage elongation after fracture is 6.0-10% and the Brinell hardness is 110N/sq.m-150N/sq.m. The preparation method comprises the following steps of: preparing the raw material, melting, casting, homogenizing annealing, forging, extruding, bending, quenching, coldly compressing to deform, flattening and ageing the raw materials to obtain the aluminum alloy semi-ring for the fairing of the launch vehicle. The aluminum alloy semi-ring for the fairing of the launch vehicle has a high intensity and can be applied to the large-scale launch vehicle.

The invention relates to an electrodeposition-laser remelting strengthening process of a Ni-nanometer TiN composite layer on a surface of a nickel base superalloy. The process comprises the following steps: (1) preparation of plating solution: the plating solution comprises such components as nickel aminosulfonate, nickel chloride and water solution of boric acid; (2) preparation of electrodes: the area ratio of an anode to a cathode is 1.5: 1; and the anode and the cathode are arranged in parallel by a distance of 30 mm; (3) composite electrodeposition: a power supply adopts a two-way high-frequency pulse power supply; and (4) laser remelting: a solid pulse laser processor is adopted to perform the one-way laser remelting; and applied power ultrasonic waves, high-intensity magnetic fields and high-frequency pulse current parameters assist the electrodeposition process. The process organically combines the electrodeposition Ni-nanometer TiN composite layer technology with the laser cladding technology, is a new composite processing technology of physics and electrochemistry, and has the advantages of high processing efficiency and quality and wider application range. The process can satisfy the use requirements of nickel base alloy parts under the working conditions of high speed, high temperature, high impact load and corrosion.

The present invention discloses an aluminum alloy evaporator inner wall thin plate and a continuous casting rolling production process thereof. The thin plate adopts an aluminum manganese alloy as a base, contains silicon, iron, copper, manganese, magnesium, zinc and titanium, and is prepared by adopting a continuous casting rolling production process. The process comprises the following steps: adding raw materials to a smelting furnace to carry out melting, refining, and residue removing; discharging the resulting material to a cast rolling machine from the furnace to carry out cast rolling; carrying out a first annealing treatment on the cast-rolled plate material to reduce needle-like FeAl3 and influence on mechanical property by a phase composition, wherein the phase composition and the Al-Mn solid solution achieve phase equilibrium; carrying out cold rolling on the first-annealed plate material 5-6 times; carrying out a second annealing treatment on the cold-rolled plate material; and carrying out foil rolling 1-2 times to prepare the aluminum alloy evaporator inner wall thin plate. The technical scheme of the present invention has the following characteristics that: good moldability, good weldability, and good corrosion resistance are provided, structure and performances are uniform, metallurgical defects are less, anisotropy is low, strength is high strength, elasticity is good, and the like.

The invention provides a rare earth magnesium alloy. The rare earth magnesium alloy is characterized by comprising the following components by mass percent: 0.5 to 4.0% of Zn, 0.1 to 2% of Gd, 0.3 to 0.9% of Zr, and the balance of Mg. The preparation method of the rare earth magnesium alloy sheet comprises the following steps of: treating a rare earth magnesium alloy ingot casting by uniform annealing; cooling with water; milling the surface; preheating a milled blank; rolling for four to eight times; melting down and heating once every two to three times after rolling; continuously rolling, wherein the total rolling reduction is 70 to 95%; annealing the sheet subjected to hot rolling; performing cold rolling for a moderate-thickness sheet subjected to hot rolling for two to four times; and then annealing the sheet subjected to cold rolling to obtain the rare earth magnesium alloy sheet. The invention also provides a preparation method of the rare earth magnesium alloy and the sheet thereof. The rare earth magnesium alloy sheet is high in plasticity and high in heat stability. Compared with hot rolling, cold rolling has the advantage that the magnesium alloy can be prevented from being oxidized into a film during heating; in addition, the prepared sheet is accurate in dimension and uniform in thickness; a thin belt which cannot be produced by hot rolling can be obtained; and mass production and application can be realized.

The invention discloses a technological method, particularly discloses a technological method of reducing the number of metallurgical defects of a GH4169 nickel base alloy ingot, belongs to the technical field of nickel base alloy remelting production technologies, and provides the technological method of reducing the number of the metallurgical defects of the GH4169 nickel base alloy ingot. The quality defects of a finished product of the technological method are few. According to the technological method, the GH4169 nickel base alloy molten ingot which is obtained through vacuum induction melting serves as a basic ingot, and the purpose that the number of the metallurgical defects of the GH4169 nickel base alloy ingot is reduced is achieved through one-time homogenization treatment, one-time high-speed forging, upsetting and pulling operation and one-time remelting operation.

The invention belongs to the technical field of high-quality deformed high-temperature alloy preparation for aero engines, and relates to a vacuum consumable remelting method of a deformed high-temperature alloy GH4169. The vacuum consumable remelting method specifically comprises the steps of preparing consumable electrodes by electroslag remelting, electrode ingot high-temperature stress reliefannealing, machining, electrode welding, centering charging, three-stage control consumable remelting and the like. The vacuum consumable remelting method has the outstanding advantages that the riskof segregation metallurgical defects generated in the process of high-niobium deformed high-temperature alloy vacuum consumable remelting can be reduced, and meanwhile, the batch stability and usage reliability of prepared deformed high-temperature alloy materials are improved.

The invention discloses a continuous rolling method of evaporator inner wall aluminum alloy foils, and relates to the field of material molding, in particular to the continuous rolling method of the evaporator inner wall aluminum alloy foils. The method comprises the following steps: firstly, needed raw materials are prepared; wastes in the raw materials adopt pure aluminum; the total input of thewastes is not more than 35%, wherein the second-grade waste input is not more than 30%, and raw aluminum ingots are not less than 65%; the raw materials are fed in a smelting furnace for melting; themolten raw materials are stirred and slagged, and components of the raw materials are adjusted; the slagged raw materials are refined in the smelting furnace; the refined raw materials are transferred into an insulation furnace for secondary refining and standing; and the secondarily refined raw materials are discharged into a degassing box for degassing and slagging. The production process is simple; the production efficiency can be improved; and produced final foils are excellent in molding property, welding property and corrosion resistance, uniform in structure and performance, few in metallurgy defect, low in anisotropy and more suitable for serving as evaporator inner walls.

The invention discloses a hot-isostatic-pressing forming method for in-situ generation of a continuous spatial net structure. According to the hot-isostatic-pressure forming method for in-situ generation of the continuous spatial net structure, the surface of a powder base material is covered with a layer of reinforcing materials before hot-isostatic pressing according to the reinforcing requirement of the base material during actual application, and the base material and the reinforcing material are subjected to an in-situ reaction under the effect of high temperature and high pressure of hot-isostatic pressing, so that a new compound with a reinforcing effect is generated, and the compound exists on the boundary of an original powder particle in the form of the continuous spatial net structure. Metallurgical defects caused by an oxide layer on the surface of the original powder particle are effectively reduced through the spatial net structure, and the metallurgical bonding strength between different kinds of powder is improved; and in addition, through a newly-generated reinforcing phase, relevant performance of the base material can be improved, the service life of a hot-isostatic-pressed workpiece is prolonged, and the safety of the hot-isostatic-pressed workpiece is improved.

The invention relates to the field of aero-engines and gas turbines, and particularly relates to a technical method for manufacturing an aero-engine cyclone through a special processing technology. The method comprises the step of manufacturing a cyclone blank, wherein the cyclone bank is manufactured through a cylindrical forging piece. The method further comprises the step of manufacturing semi-finished cyclone and the step of finishing through pincers; the step of manufacturing the semi-finished cyclone is that the cyclone blank is sequentially subjected to turning processing and electric spark processing to obtain the semi-finished cyclone; the step of finishing through the pincers is that the semi-finished cyclone is finished based on the requirement on a finished cyclone so as to obtain the finished cyclone. According to the method, the forging piece is outstanding in mechanical property, and two processing modes are provided, so that the manufactured cyclone product is high in strength and toughness; the yield is increased; and the processing cost and the processing period are reduced; the manufactured cyclone product can stably run for a long time in an aero-engine combustion chamber; and the service life of the aero-engine combustion chamber cannot be influenced by the quality of the cyclone.

The invention discloses a TOPTIG electric arc additive material device for modifying aluminum alloy. The TOPTIG electric arc additive material device comprises a nozzle, a clamping sleeve is arranged on a nozzle sleeve, a tungsten electrode is located in the clamping sleeve, the nozzle is located over a workpiece, the nozzle is connected with a powder feeder through a powder feeding pipe, and a powder heating box for heating powder is arranged on the powder feeding pipe; a wire feeder is arranged on the side wall of the nozzle, and the bottom end of the wire is located at the front end of the tungsten electrode. The invention further discloses a material adding method of the TOPTIG electric arc material adding device for modifying the aluminum alloy. By the adoption of the TOPTIG electric arc material increasing device and method for modifying the aluminum alloy, the problems that the forming efficiency of existing material increasing manufacturing is low, and the performance of the formed aluminum alloy is poor can be solved.

The invention discloses a high-strength Al-Fe-Sc alloy capable of being used for laser additive manufacturing. A preparation method of the high-strength Al-Fe-Sc alloy capable of being used for laser additive manufacturing comprises the steps that according to the composition proportion, raw materials are weighed to be prepared into a mixture, and vacuum melting and argon atomization are carried out. The raw materials comprise the following components in percentage by mass: 2.5-5.5 wt% of Fe; 0.3-0.6 wt% of Sc; 0.1-0.3 wt% of Zr; 0.1-0.15% of Ti; 0.2-0.28 wt% of Si; 0.3-0.5% of Mn; 0.3-0.5 wt% of Mg; 0.2-0.3 wt% of Cu; and the balance Al. The 3D printing Al-Fe alloy is a supersaturated solid solution, Fe elements are almost completely dissolved in Al crystal lattices, the maximum solid solubility of the Fe elements can reach 5.5 wt%, the problem that a traditional Al-Fe alloy cannot be subjected to supersaturated solid solution is solved, and compared with an existing Al-Fe alloy prepared through smelting casting and forging, the 3D printing Al-Fe alloy is good in mechanical property, high in yield strength and low in anisotropy.