Grain refiner and application of grain refiner in aluminum alloy wheel hub
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A technology of aluminum alloy wheel hub and grain refiner, which is applied in the field of metal materials, can solve the problems of poor dispersion of particle aggregation, long preparation cycle, and increased response time of intermediate alloys, etc.
Inactive Publication Date: 2013-03-06
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Problems solved by technology
Although the master alloy can have a certain refining effect on aluminum alloys, the preparation cycle of the master alloy is long, the energy consumption is large, the oxidation and burning of the metal is serious, and the intermetallic compound TiAl in the alloy structure 3 T
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Embodiment 1
[0010] (1) Preparation of the reaction block: the powdery Al, Ti, B participating in the reaction are proportioned according to 75%, 15%, and 10% of the mass percentage respectively, and the ball mill is mixed and then extruded into a billet, and then the compact Place in a vacuum reaction furnace to preheat to about 1000K, keep the temperature for 20 minutes after the reaction lasts for 30 seconds, then cool to room temperature and then heat the compact to 460°C, and extrude it into a reaction block according to the extrusion ratio of 15:1;
[0011] (2) Melting of the matrix alloy: melting an aluminum ingot containing 6.5% silicon and 0.45% magnesium at a temperature of 740°C, adding a covering agent and a refining agent, degassing, and standing to obtain a matrix alloy melt;
[0012] (3) Injection of the reaction block: put the reaction block into an electromagnetic induction furnace for heating and drying, and preheat the reaction block to 250°C within 30 minutes and keep it...
Embodiment 2
[0015] (1) Preparation of the reaction block: the powdered Al, Ti, B participating in the reaction are proportioned according to 65%, 25%, and 10% of the mass percentage respectively, and the ball mill is mixed and then extruded into a billet, and then the compacted Put it in a vacuum reaction furnace and preheat it to about 1000K. After the reaction lasts for 30 seconds, keep it warm for 20 minutes, then cool to room temperature and then heat the compact to 450°C, and extrude it into a reaction block according to the extrusion ratio of 15:1;
[0016] (2) Melting of the matrix alloy: Melting an aluminum ingot containing 7.0% silicon and 0.35% magnesium at a temperature of 750°C, adding a covering agent and a refining agent, degassing, and standing still to obtain a matrix alloy melt;
[0017] (3) Injection of the reaction block: put the reaction block into an electromagnetic induction furnace for heating and drying, and preheat the reaction block to 300°C within 30 minutes and ...
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Abstract
The invention relates to a grain refiner and an application of the grain refiner in an aluminum alloy wheel hub. The grain refiner is characterized by being prepared through the following steps: (1) preparing powdery Al, Ti and B participating in the reaction according to mass percents of 65-75%, 15-30% and 5-10%; (2) smelting an aluminum ingot containing 6.5-7.5% of silicon and 0.3-0.45% of magnesium, adding a covering agent and a refining agent, degassing and stewing to obtain a matrix alloy fused mass; and (3) putting reaction blocks in an electromagnetic induction furnace for heating and drying, pressing the reaction blocks into the fused mass according to 5-10% by mass of the matrix melt through an immersion bell in batches, keeping the temperature for 20 min to perform thermal explosion synthetic reaction on the reaction blocks in the fused mass so as to crack and disperse the reaction blocks due to strong heat release, and mechanically stirring the fused mass to completely dilute the synthetic product and disperse the synthetic product in the aluminum fused mass. The solution and diffusion periods of the TiAl3 phase of the aluminum alloy solution prepared by the method are greatly reduced, the dispersibility of the TiB2 particles is greatly improved to facilitate the refining function, and the size of the casting crystalline grain of an intermediate alloy can be effectively controlled to be lower than 40 microns.
Description
technical field [0001] The invention relates to a grain refiner and its application in an aluminum alloy wheel hub, belonging to the technical field of metal materials. The prepared grain refiner can refine the aluminum alloy grains, and significantly improve the strength and toughness. Background technique [0002] Due to its light weight, high specific strength, corrosion resistance, good electrical and thermal conductivity, and easy processing, aluminum alloys are widely used in machinery, aerospace, automobiles, and other fields. However, because the alloy is easy to form a coarse grain structure under casting conditions, in order to realize its wide application, it is necessary to improve its as-cast structure and then improve its performance. At present, in the industrial production of aluminum alloy, the method of adding Al-Ti-B master alloy to the melt is generally used to achieve the purpose of grain refinement, and the preparation of Al-Ti-B master alloy is genera...
Claims
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Application Information
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