8results about How to "Eliminate composition segregation" patented technology

The invention belongs to but is not limited to the technical field of aluminum alloy preparation, and discloses a high-plasticity aluminum alloy prepared from secondary aluminum and a preparation method, high-quality secondary aluminum waste is selected, and obvious impurities are removed; carrying out chemical or mechanical cleaning on the secondary aluminum, and sorting; the pretreated secondary aluminum waste is added into a smelting furnace to be smelted; a purifying agent is added for melt purification; the melt is further purified through inert gas stirring and standing; adding a proper amount of alloy elements into the melt; under the protection of inert gas, uniformly stirring the melt; casting the melt into a cast ingot by adopting a semi-continuous casting or continuous casting process; controlling the cooling speed; carrying out homogenizing heat treatment on the cast ingot to eliminate composition segregation in the cast ingot; and extruding and rolling to obtain the high-plasticity aluminum alloy material. According to the method, the purity of the aluminum alloy is improved, the performance uniformity is enhanced, and the aluminum alloy material with high plasticity and excellent mechanical performance is obtained and is suitable for industrial application with high requirements.

The invention provides an Al-Mg series welding wire and a preparation method and application thereof. The method comprises the steps that alloy raw materials are smelted and cast according to the component proportion, an obtained aluminum alloy cast rod is sequentially subjected to homogenization treatment, extrusion, hot rough rolling, hot finish rolling, drawing and coiling, and the Al-Mg series welding wire is obtained; wherein hot finish rolling emulsion is further used for hot rough rolling and hot finish rolling, the mass concentration of the hot rough rolling emulsion is larger than that of the hot finish rolling emulsion, and the pH of the hot rough rolling emulsion is smaller than that of the hot finish rolling emulsion. Alloy elements are uniformly distributed by controlling alloy components and using homogenization treatment and an extrusion process, so that component segregation is effectively eliminated, the welding wire has relatively high strength, and the wire processing performance is improved; meanwhile, a reasonable wire processing technology is adopted, the components of rolling emulsion are regulated and controlled, the surface quality of the welding wire is improved, the prepared finished welding wire can guarantee stable combustion of electric arcs and a molten pool in the welding process, and the welding seam quality is effectively improved.

The invention discloses a heat-treatment-free die-casting aluminum alloy welding method based on a laser oscillation technology. The heat-treatment-free die-casting aluminum alloy welding method comprises the steps that firstly, a to-be-welded plate is pretreated; the to-be-welded plate is a heat-treatment-free die-casting aluminum alloy plate; secondly, the to-be-welded plate is clamped through a clamp, the position of a laser oscillation welding head is adjusted, and an included angle is formed between the axis of a laser beam and the vertical line direction of the to-be-welded plate; thirdly, the laser oscillation welding head emits an oscillation laser beam to weld the plate to be welded, the oscillation frequency of the oscillation laser beam ranges from 50 Hz to 200 Hz, and the oscillation amplitude ranges from 5 mm to 7 mm; and fourthly, after solution treatment, water quenching and aging treatment are conducted on the welded plate, the welded plate is cooled to the room temperature. According to the heat-treatment-free die-casting aluminum alloy welding method based on the laser oscillation technology, the problems that in the heat-treatment-free die-casting aluminum alloy welding process, welding seams collapse, the porosity is high, and the second phase is thick can be solved, and the welding quality of the heat-treatment-free die-casting aluminum alloy is improved.

A high-alloy steel electroslag ingot and its homogenization method are provided, comprising the following steps: S1, electroslag ingot pretreatment: removing surface oxide scale and crack defects, and grinding to a surface roughness Ra≤6.3μm; S2, staged heating: heating to 800-900℃ at a rate ≤100℃ / h and holding for 2-6h; heating to 1000-1100℃ at a rate ≤100℃ / h and holding for 2-6h; heating to 1200-1300℃ at a rate ≤150℃ / h and holding for 10h. -20h; S3, Stepped cooling: Turn off the heating device and cool with the furnace to 800-1000℃, hold for 2-6h; cool to 500-650℃ at a rate of ≤50℃ / h, hold for 2-6h; open the furnace door and introduce cooling air at a speed of 0.5-3m / s to cool to room temperature, obtaining homogenized high-alloy steel electroslag ingots; S4, Post-homogenization testing: the relative standard deviation of each alloying element is ≤5%; the average grain size is ≤10μm; the Brinell hardness fluctuation range is ≤15HBW. This invention eliminates component segregation, refines grain structure, optimizes process parameters, is highly efficient and energy-saving, easy to promote, and has strong practicality.

The application discloses a kind of self-adapting temperature control type energy-saving waste mould steel metal electroslag remelting device, it is related to metal electroslag remelting technical field, including remelting furnace body, the outside lower portion of remelting furnace body is provided with bearing base;The inside of remelting furnace body is provided with remelting mechanism, and remelting mechanism contains remelting material cylinder;Wherein, the inside central position of remelting material cylinder is fixedly installed with remelting vertical pipe;The inside of remelting furnace body is provided with temperature control mechanism, and temperature control mechanism contains temperature control lining cylinder.The self-adapting temperature control type energy-saving waste mould steel metal electroslag remelting device, by the temperature control lining cylinder of remelting furnace body and temperature control uniform rod, for remelting material cylinder realizes the dispersion of internal and external heat, cooperate with the rotating remelting material cylinder and material uniform support auxiliary promotion waste mould steel heating uniformity, while electric heating box realizes internal temperature detection to eliminate artificial intervention error, and after melting, it is taken out to realize cooling and deoxidizing refining.

The invention relates to the technical field of aluminum foil production, in particular to a production method of regenerated aluminum alloy foil for an adhesive tape, which comprises the following steps of: 1, smelting and casting aluminum alloy waste into an aluminum alloy cast ingot; 2, the aluminum alloy cast ingot is subjected to surface milling treatment; 3, the aluminum alloy cast ingot is subjected to soaking treatment; 4, the aluminum alloy cast ingot is subjected to hot rolling treatment; 5, the aluminum alloy coiled material is subjected to cold rolling treatment; 6, intermediate annealing treatment is conducted on the aluminum alloy coiled material; 7, cold foil rolling treatment is conducted on the aluminum alloy coiled material; and 8, annealing treatment is conducted on the aluminum alloy foil finished product. The defects of the aluminum alloy foil for the adhesive tape caused by pinholes and holes can be effectively prevented; meanwhile, composition segregation of the aluminum alloy cast ingot is effectively eliminated, and the internal stress of the aluminum alloy cast ingot is reduced; and growth of crystal grains in a high-temperature state is effectively avoided, and the structure performance of the crystal grains is improved.

This invention discloses a continuous casting and rolling process for high-strength copper alloys, relating to the field of metallurgical engineering technology, comprising the following steps: (a) heating the copper matrix containing tin, zinc, and nickel, and adding appropriate amounts of rare earth elements, in a melting furnace to 1200-1300°C until a uniform copper alloy melt is formed; (b) maintaining the copper alloy melt in an optimal casting temperature range of 1150-1200°C using a holding furnace with temperature control function; (c) continuously casting the held copper alloy melt into long strip billets using a continuous casting machine equipped with an electromagnetic stirring device. The technical solution provided by this invention ensures the fluidity and purity of the copper alloy melt, significantly reduces inclusions using electromagnetic stirring technology, effectively promotes uniform solid solution of alloying elements and the formation of fine, dispersed strengthening phases, introduces a homogenization treatment stage, eliminates component segregation, and improves the uniformity of the material.

The present invention relates to a method for determining a homogenization heat treatment process of a GH2909 alloy, comprising the steps of: characterizing the Laves phase transition point temperature in the alloy, and setting the temperature as Tc. Calculating the critical time t0 for the alloy to completely dissolve the Laves phase at a temperature T0; selecting a small range of dendrite structures, testing and counting the Nb element content, calculating the Nb element segregation coefficient and counting the Laves phase content; placing the cast alloy in a heat treatment furnace, heating it to a temperature T0, holding it for a time of t1, cooling it to room temperature and counting the Laves phase content in a non-overburned sample; fitting the Laves phase content changes under different processes, and determining the homogenization time for the Laves phase to completely melt back; placing the alloy with the Laves phase completely melted back in a heat treatment furnace, heating it and holding it for a time of t2, cooling it to room temperature and measuring the Nb element content, calculating the residual segregation coefficient δ, and if δ>0.2, extending the time t2 until δ<0.2. The present invention can effectively promote the melting back of the precipitated phase, eliminate component segregation, and obtain a more uniform structure.