Aluminum niobium boron intermediate alloy preparation method for crystalline grain refinement, aluminum niobium boron intermediate alloy, aluminum niobium boron cast ingot and aluminum niobium boron alloy rope

Abstract

The invention discloses an aluminum niobium boron intermediate alloy preparation method for crystalline grain refinement. The aluminum niobium boron intermediate alloy preparation method comprises thefollowing steps that an industrial pure aluminum ingot, an aluminum niobium alloy and an aluminum boron alloy are prepared; the industrial pure aluminum ingot is melted, and the aluminum niobium alloy is added in with the temperature being 1150-1250 DEG C; the temperature of an obtained solution is controlled to be 920-1250 DEG C, and the aluminum boron alloy is added in; foam removing and slag cleaning are performed on the obtained solution; and then the solution is transferred to a casting furnace, and refining degassing is performed to prepare an aluminum niobium boron intermediate alloy.The aluminum niobium boron intermediate alloy preparation method is simple and feasible, the product impurity element content is extremely low, use of corrosive KBF4 salt in the casting process is avoided, meanwhile, the aluminum niobium alloy is used to replace pure niobium to improve the operability, and the cost is reduced; and the aluminum niobium boron intermediate alloy prepared by the aluminum niobium boron intermediate alloy preparation method is uniform in structure, small in fineness, extremely low in impurity content and convenient and efficient to apply when serving as a crystalline grain refinement agent, metal burning damage can be effectively avoided, so that the alloy internal cleanliness is guaranteed, and the improvement effect on casting crystalline grain is obvious.

Description

technical field [0001] The invention relates to the technical field of master alloys, in particular to a method for preparing an aluminum-niobium-boron master alloy for grain refinement, an aluminum-niobium-boron master alloy, an aluminum-niobium-boron ingot, and an aluminum-niobium-boron alloy rope. Background technique [0002] In the field of metal alloys, refining the alloy grains can effectively improve the alloy properties, including the strength and ductility of the material, reduce the tendency of hot cracking and effectively inhibit porosity, which is one of the most effective methods to improve the comprehensive mechanical properties of the alloy. Currently, the main means of refining alloy grains is by adding "grain refiners" to alloys, which are considered to be intermediate substances that promote crystal optimization of metal alloys. [0003] With the continuous development of automobile lightweight and the gradual implementation of the national energy conserva...

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Problems solved by technology

[0020] In summary, the method described above also has the following disadvantages: the first, the use of elemental niobium metal to prepare niobium-containing binary, ternary or multivariate refiners is not suitable for mass production and is expensive

Second, use fluoroborate to prepare binary, ternary or multi-component refiners containing niobium and boron. Since the temperature must be lowered from about 1100 to 800°C, fluoroborate can be added for reaction, resulting in long-term niobium in Subsidence occurs in molten aluminum, and the yield of niobium is low

Third, directly adopt binary, ternary or multi-element refiner ingots or continuous casting and rolling rods containing niobium and boron to add to the cast aluminum alloy to be refined, resulting in large pieces of refiner precipitation and Al3Nb and NbB2 Reunion, not suitable for modern casting process

And the current related inventions related to the master alloy do not see the process of winding and storing the product pressing wire, which limits its use efficiency in the downstream preparation of metal alloys

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