46results about How to "Microorganized" patented technology

The invention discloses a low-pressure casting method of an aluminum alloy automobile hub. In the method, by optimizing alloy component design, adding a proper amount of Al-Ti-B-C refining agent and rare-earth modifying agent, low-pressure casting process parameters and thermal treatment parameters are optimized, so that the prepared automobile hub is provided with a tissue consisting of fine and uniform a dendritic crystal and fine and uniform worm-shaped or spherical silicon, and the performance of the aluminum alloy automobile hub is improved.

The invention discloses a vacuum brazing process of a stainless steel plate-fin structure, comprising: firstly placing a fin on a baffle and then placing a baffle thereon, placing a solder foil between the fin and the baffles, and then sealing the two sides by edge sealing tapes to form an elementary unit; stacking up a plurality of elementary units according to the design requirements, then using a special jig to clamp and firm the units and exerting pressure on the units, and placing the units in a vacuum brazing furnace; vacuumizing the brazing furnace firstly; then heating the stainless steel plate-fin structure to 850 to 870DEG C and then preserving the heat; and again heating the stainless steel plate-fin structure to the brazing temperature of 1070 to 1100DEG C and then preserving the heat; and then self-cooling the structure slowly in vacuum from the brazing temperature of 1070 to 1100DEG C to 620 to 640DEG C, then filling nitrogen into the furnace, starting up a fan to cool the structure to 40 to 60DEG C so as to take out the structure, and finally obtaining the stainless steel plate-fin structure. The stainless steel plate-fin structure acquired through the brazing process has excellent microstructures and rather high strength.

The invention relates to an 800MPa grade low-welding crack sensitive tempering type hydroelectric steel plate. The steel plate comprises the following components in percentage by weight: 0.09-0.14% of C, 0.24-0.35% of Si, 0.7-1.45% of Mn, less than or equal to 0.013%, less than or equal to 0.002% of S, less than or equal to 0.035% of Nb, 0.012-0.02% of Ti, 0.30-0.50% of Ni, 0.020-0.070% of Alt, 0.035-0.060% of V, 0.25-0.60% of Cr, 0.25-0.55% of Mo, 0.15-0.30% of Cu, less than or equal to 0.0060% of N, less than or equal to 0.00030% of H, 0.0008-0.002% of B and the balance of Fe. The preparation method comprises the following steps: smelting and casting to a cast blank according to set compositions; heating and rolling in two stages; and quickly cooling to temper and thermally treat to obtain excellent strength, plasticity and low-temperature impact toughness which are matched, so that the request on hydroelectric steel is satisfied.

The invention discloses low-carbon-equivalent 1180 MPa-grade hot galvanizing dual-phase steel and a production method thereof, and belongs to the technical field of cold-rolled plate strip production.The low-carbon-equivalent 1180 MPa-grade hot galvanizing dual-phase steel comprises the following chemical components including, by mass percent, 0.05-0.14% of C, 0.05-0.40% of Si, 1.20-2.50% of Mn,less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.015-0.070% of Als, less than or equal to 0.0060% of N, 0.006-0.20% of Mo, 0.010-0.040% of Nb, 0.010-0.040% of Ti, 0.20-0.67% ofCr, larger than 0 and less than 0.005% of B, and the balance Fe and inevitable impurities. The production method comprises the processes of smelting, hot rolling, acid rolling, hot galvanizing and thelike. According to the low-carbon-equivalent 1180 MPa-grade hot galvanizing dual-phase steel and the production method thereof, the steel has excellent mechanical properties, the yield strength is 880-960 MPa, the tensile strength is 1193-1276 MPa, the elongation A80 is 6.0-10.0%, and the problem that the steel cannot meet the requirements of high strength, high yield strength and low cost at thesame time can be effectively solved.

The invention relates to the field of metal working, and discloses a heat treatment technique of large-size GCr15 steel, which comprises the following steps: a) heating large-size GCr15 steel with the diameter of 20-150mm to 835-850 DEG C, and keeping the temperature for 30-60 minutes; b) carrying out water quenching at the water temperature of 20-60 DEG C; c) when the color on the product surface darkens and red completely disappears, immediately taking the product out of water and carrying out oil quenching; and d) after quenching, tempering the product. The heat treatment technique adopts a double quenching method; in the GCr15 steel heat treatment quenching process, the material is firstly subjected to pre-quenching with the water medium with favorable thermal conductivity, and then subjected oil quenching after the surface layer is hardened, thereby completing the final quenching technique; and finally, the material is tempered. The technique can enable the surface layer of the large-size GCr15 steel to reach high hardness, and enhances the abrasion resistance of the material as compared with the existing technique.

The invention relates to a rare-earth-added ultra-fine grain high-toughness WC-10Co hard alloy material and a preparation method, and belongs to the field of powder metallurgy. The hard alloy comprises the components: 88.7 percent to 89.1 percent of tungsten carbide, 10 percent of cobalt, 0.5 percent of vanadium carbide, 0.3 percent of chromium carbide, and 0.1 percent to 0.5 percent of praseodymium oxide (or 0.1 percent to 0.5 percent of neodymium oxide). Rare earth oxide can be used for refining WC grains through influencing the content of W elements in binding-phase Co and influencing the liquid phase temperature in sintering, so that the hardness of the hard alloy is improved; and in addition, the rare earth oxide can be used for enhancing the toughness through acting on a Co phase. The alloy continuity can be worsened along with the increase of the content of the rare earth oxide, so that the adding content of the rare earth oxide is limited within a certain range. The rare-earth-added ultra-fine grain high-toughness WC-10Co hard alloy is prepared through ball milling, briquetting and vacuum sintering. The hard alloy provided by the invention is fine in grain size which reaches to 190nm minimally, higher in hardness which reaches up to 2100HV, and favorable in toughness which reaches up to 28.17MPa.m1/2 at the same time. A hard alloy product with high hardness and high toughness at the same time is not publicly reported.

A radial forging strain-induced semi-solid state process for manufacturing an aluminum alloy crankshaft of an air condition compressor comprises the steps that an aluminum alloy bar material is preheated, radial forging is carried out on the aluminum alloy bar material, secondary remelting is carried out on a bank after radial forging, then semi-solid thixotropy forging of the aluminum alloy crankshaft is carried out, and subsequent processing of the aluminum alloy crankshaft is carried out. The uniform aluminum alloy semi-solid blank without mirodefects can be manufactured and the aluminum alloy crankshaft with fewer microstructure defects and good mechanical performance is formed and replaces a cast iron crankshaft through the process, the process is simple, and operation is easy.

The invention relates to a non-electric welding agent applicable to emergency welding repair of low-carbon steel thin-walled sheet parts below 5mm. The welding agent is formed by mixing powdery thermite, slagging constituents, alloying agents and thinners. The welding agent generates the self-propagating reaction after being ignited, the thermite in the welding agent reacts to generate heat for maintaining reaction and also provide enough heat to enable parent metal to melt, and the metal part generated by the thermite and the melting part of the parent metal jointly form a molten bath to be subjected to metallurgic reaction at high temperature; the slagging constituents and Al2O3 generated by the thermite jointly form slag low melting point and viscosity, the slag is effectively separated from metal ingredients in the molten bath, Al2O3 is taken out, and the defect of slag inclusion in weld metal is overcome; alloy ingredients in the alloying agents enter the molten bath at high temperature generated by the thermite and participate in the metallurgic reaction of the molten bath jointly, so that the weld metal has the ideal microstructure and reasonable mechanical property; the thinners are used for adjusting the self-propagating reaction speed and reaction temperature of the welding agent, so that operation is convenient.

The invention discloses a laser-cladding seven-element high-entropy alloy coating and a preparation method thereof, and belongs to the technical field of alloy surface coating modification. High-entropy alloy powder is prepared from Al, Co, Cr, Fe, Mo, V and Ti; a substrate is Ti-6Al-14V(TC4) titanium alloy, the atom fraction of each raw material in the high-entropy alloy powder is Al (10% to 16%), Co (11% to 15%), Cr (9% to 16%), Fe (6% to 15%), Mo (8% to 17%), V (8% to 15%) and Ti (12% to 16%), and the sum of all components is 100%. The high-entropy alloy coating is formed by cladding the prepared alloy powder on the surface of the substrate by a high-energy laser beam emitted from a CO2 laser, the substrate and a cladding layer are metallurgically combined to achieve the purpose of surface modification, thus the hardness, wear resistance and corrosion resistance of titanium alloy are improved, and the service life of the titanium alloy is further prolonged.

The invention provides a preparation method of a titanium alloy seamless pipe. The preparation method comprises the following steps: step 1, smelting titanium sponge and intermediate alloy for multiple times to obtain a titanium alloy cast ingot; step 2, heating the titanium alloy cast ingot obtained by smelting, carrying out drawing forging, and carrying out multi-heating-number upsetting and drawing above the transformation temperature of the titanium alloy and below the transformation temperature of the titanium alloy in a staggered manner to obtain a titanium alloy bar blank; step 3, punching a through hole in a titanium alloy bar, and performing boring to obtain a titanium alloy hollow bar blank; step 4, coating the inner surface and the outer surface of the heated titanium alloy hollow rod blank with lubricating agent, and then extruding the titanium alloy hollow rod blank to obtain a titanium alloy extruded pipe blank; step 5, performing one-time forming precision forging on thetitanium alloy extruded pipe blank to obtain a precision forging finished pipe blank; and step 6, conducting straightening and machining after overall heat treatment to obtain the titanium alloy seamless pipe. The titanium alloy seamless pipe manufactured by the preparation method has the advantages of being adjustable in pipe outer diameter and shape, high in size precision, high in structural uniformity and the like.

Disclosed is a semisolid process for manufacturing an engine aluminum alloy cam shaft through a radial forging strain provocation method. Aluminum alloy rod materials are preheated and then forged in the radial direction, a blank is remelted again after radial forging, the aluminum alloy cam shaft is extruded and cast, and finally follow-up treatment is carried out on the aluminum alloy cam shaft in the radial direction. Through the process, the uniform aluminum alloy semisolid blank without micro defects can be manufactured, the aluminum alloy cam shaft which has a few micro structure defects and is good in mechanical performance can be formed, and the process is simple and easy to operate.

The invention relates to a 500MPa-level low-Cu Mg-free aluminum alloy and a preparation method. The 500MPa-level low-Cu Mg-free aluminum alloy comprises the following chemical components in percentageby weight: 3.3-3.8% of Cu, 0.6-0.9% of Mn, 0.4-0.7% of Zn, 0.5-0.8% off Fe, 0%-0.5% of Si, 0%-0.15% of Ti, 0%-0.1% of Ni, and the balance being Al and inevitable impurities. The method includes: annealing the casting blank by adopting a standardized complete annealing process system; carrying out hot rolling on the homogenizing annealed casting blank, carrying out solid solution treatment, immediately quenching, and carrying out cold rolling to obtain a thin plate; performing classified aging process for thin plates as in the following: 200 DEG C/11-14h+230-250 DEG C/30-60min+180-200 DEG C/10-14 h, the 500 MPa-level low-Cu Mg-free aluminum alloy plate with the thickness of 1.5 +/-0.5 mm is obtained.

The invention provides a heat treatment method for a cast aluminium alloy. The heat treatment method is characterized in that the cast aluminium alloy is subjected to low-temperature short-time agingtreatment at first, then subjected to two-step solution treatment and room-temperature quenching, and finally subjected to two-step aging treatment. The heat treatment method provided by the inventionhas the following beneficial effects: with the adoption of the heat treatment method provided by the invention, the casting produced from the alloy is high in mechanical property, and the productioncost is greatly lowered.

The invention discloses a preparation method of a low-density Nb-Ti-Al-V-Zr-C niobium alloy bar. The method comprises the following steps: 1, carrying out primary extrusion on a low-density Nb-Ti-Al-V-Zr-C niobium alloy ingot to obtain a primary extruded bar; 2, performing secondary extrusion to obtain a secondary extrusion rod; 3, quenching treatment; 4, free forging processing; and fifthly, vacuum annealing is conducted, and the low-density Nb-Ti-Al-V-Zr-C niobium alloy bar is obtained. According to the method, the low-density niobium alloy bar is prepared through the technology of two-time extrusion, quenching and forging, the quenching treatment technology and the secondary extrusion technology are added, the carbide reinforced phase TiC is separated out and nucleated again after redissolution and is dispersed and distributed in a matrix, the size of the carbide reinforced phase is effectively reduced, and the dispersity of the carbide reinforced phase is improved; the elongation after fracture of the low-density niobium alloy bar is improved, so that the low-density niobium alloy bar shows room-temperature high-strength and high-plasticity mechanical properties.