Method for controlling grain size of 1-series alloy cast-rolled plate in cast-rolling process

Abstract

The invention provides a method for controlling the grain size in the casting and rolling process of a 1-series alloy cast-rolled plate, which comprises the following steps of: (s1) increasing the degree of supercooling: controlling the metal purity of 1-series alloy, and controlling the percentage range of Si to be 0.08-0.18%; 0.15 to 0.55 percent of Fe; cu: 0.02 to 0.04%; 0.02% of Mn; 0.02 to 0.03 percent of Ti; al: 99.60 to 99.7%; (s2) modification treatment is conducted, specifically, in the cast rolling production process, a grain refiner is added before crystallization of the aluminum melt, the grain refiner is an aluminum-titanium-boron wire with the weight ratio of AlTi3 to TiB2 being 1: 1.5, and the adding proportion of the grain refiner in the cast rolling process is 0.03%-0.05%; (s3) vibration and stirring are conducted, specifically, in a cast-rolling area, the solidified aluminum plate is rotationally rolled through a cast-rolling roller, and crystal grains are crushed; the deformation amount of the casting and rolling area is 45-55%; grain refinement is completed; according to the invention, by controlling the chemical components, improving the purity of the melt, changing the degree of supercooling and providing favorable conditions for grain refinement, a proper proportion of refiner is added before the melt is cast-rolled, and the nucleation number in the melt is additionally increased, so that the crushing and refinement of grains are realized.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy processing, in particular to a method for controlling the grain size of a 1-series alloy cast-rolled plate in the casting-rolling process. Background technique [0002] Grain size is an important index to measure the quality of cast-rolled sheet. The finer the grains of the cast-rolled sheet, the better the mechanical properties, the better the plasticity and toughness of the cast-rolled sheet, and the better performance can be obtained in the subsequent processing. If the cast-rolled sheet with coarse grains is used for later cold rolling or foil rolling, streak defects will appear on the surface of the product. Therefore, the grain size should be controlled during the casting and rolling production process. The 1-series alloy belongs to the pure aluminum alloy, and the temperature, composition and external cooling conditions are extremely strict during the casting and rolling process. I...

AI Technical Summary

Problems solved by technology

In addition, the process temperature of the aluminum melt in the production process is not properly matched to provide enough energy for grain growth, which also causes grain growth.

If the grain size is too large, it will cause quality problems such as performance and pinholes in subsequent production

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