Manufacturing method of combined refining and modifying agent

Abstract

The invention relates to a manufacturing method of a combined refining and modifying agent. A preparation process comprises the steps that titanium and carbon are mixed at a certain proportion; aftercommercially pure aluminum is added into an alloy furnace and heated to be completely molten and the temperature is increased to a certain value, the mixture of titanium and carbon is added into the to-be-alloyed aluminum melt in the alloy furnace in batches through a bell jar; prepared to-be-cooled aluminum ingots are added into the melt in the alloy furnace to be cooled; metal strontium is addedinto the melt through the bell jar; drossing is carried out after alloying is carried out for a certain period; an alloy solution is transferred to a heat preservation furnace for degassing and refining; the melt flows into a degassing tank through a flow channel and undergoes online continuous homogenization treatment through ultrasonic waves; and finally the melt is cast into ingots or extrudedinto wires. The ingredients of Sr, Ti and C of an Al-Sr-Ti-C product obtained through the method are stable; in the microscopic structure of the wire products, TiAl3 is evenly distributed in a blockymode, the largest size is smaller than or equal to 100 [mu]m, and the average size is smaller than 50 [mu]m; Al3Sr is distributed in a blocky mode, and the average size is smaller than 30 [mu]m; theaverage size of TiC is smaller than 2 [mu]m; and the elongation is larger than 7% and the tension strength is larger than 120 MPa.

Description

technical field [0001] The invention belongs to the field of aluminum alloy production, in particular to a method for manufacturing combined refinement modifier aluminum strontium titanium carbon. Background technique [0002] Al-Ti-C master alloy is the most widely used grain refiner in the field of aluminum and aluminum alloys. Al-Ti-C master alloy has the incomparable quality and application performance advantages of Al-Ti-B grain refiner. For example, the aggregation tendency of TiC particles is low, which can ensure the small size and uniform dispersion of nucleation particles; it can prevent the poisoning effect of Zr, Cr, Mn, and V, and ensure the stability of its refining effect. [0003] In the cast Al-Si alloy, there are flaky eutectic silicon and coarse primary silicon with complex shapes. The coarse Si phase severely splits the matrix, reduces the strength and plasticity of the alloy, and deteriorates the performance of the alloy. There are many kinds of modifie...

AI Technical Summary

Problems solved by technology

However, in this invention, the alloy melt is poured into the sand mold, and the solidification rate is significantly lower than that of the metal mold, which is not conducive to the uniformity of the composition and structure of the product, thereby affecting the stability of the product's application performance; it is not conducive to industrialized large-scale production

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