[China Aluminum Network] Since the electrolyzed aluminum liquid and the aluminum ingot remelted aluminum liquid are refined into aluminum alloy, their properties are still different. The former has a slightly higher impurity content, a slightly higher viscosity, and less fluidity. Therefore, when casting round ingots, in order to ensure fluidity, the former's casting temperature should be about 10°C higher than the latter. For 6063 aluminum alloys, the casting temperature should be controlled at 725-740°C. In continuous casting, the better the fluidity of the alloy liquid, the shrinkage cavity produced during the solidification of the ingot is more easily fed, and the hot crack caused by the shrinkage of the ingot at the end of solidification is also more easily obtained by timely welding. The tendency to form a cold septum is also less, and it is also good for the floating of gases and impurities. Therefore, only by slightly increasing the casting temperature of the electrolytic aluminum alloy liquid and improving its fluidity can an excellent ingot be obtained.
According to the crystallization characteristics of aluminum alloys, the formation of crystal nuclei is not derived from supercooling of the aluminum alloy melt and self-nucleation, and it is actually always produced in the active impurities in the aluminum alloy melt. Although the impurity content in the electrolyzed aluminum liquid alloy is higher than that in the aluminum cast remelting alloy liquid, the impurities in the former have been lost in the high temperature environment of 940-960°C for a long time and have lost their activity into inert impurities. Become a crystalline core. Therefore, the use of electrolytic aluminum liquid production of aluminum alloy ingots, only rely on foreign crystal nucleus, increase the amount of Al-Ti-B wire in order to obtain a small grain of equiaxed crystal structure. The production practice shows that the amount of Al-Ti-B wire should be increased to 3.5-4.0kg/t, and the proportion of molten aluminum ingot alloy liquid should be increased by 50%. Otherwise, there will be a large equiaxed crystal or columnar crystal structure in round casting. .
The crystallization speed of the ingot is an important factor in determining the quality of the ingot. Generally, the greater the crystallization speed, the finer the crystal structure of the ingot, and the better the mechanical properties. Reduce ? vomiting 匪 龋 龋 龃罄淙 龃罄淙 沽Γ 沽Γ 沽Γ 沽Γ 沽Γ 沽Γ 沽Γ 沽Γ 沽Γ 沽Γ ç »å«– ç »å«– ç »å«– ç »å«– ç »å«– ç »å«– ç »å«– 龋 岣咧 诘 诘 诘 诘 诘 诘 诘 诘 诘 诘 诘 诘 诘 诘岣咧 У У У У ä¿£ ä¿£ ä¿£ è° è° è° è° è° æ ¡ ç¹ ç¹ ç¹ ç¹ ç¹ ? ? ? ? ? ? 攘 攘 攘 攘 攘
The 6063 aluminum alloy round ingot produced from the electrolyzed aluminum liquid has a great difference between the head and tail material and the product produced by the remelted aluminum ingot. The head often produces a coarse-grained structure and the tail gas is severe. At the beginning of casting, it was conscious that some Al-Ti-B wire was placed in the runner, or the speed of the feeder was increased, or it was difficult to eliminate the coarse-grained structure. Therefore, when sawing, increase the length of the head to 2 for the diameter of the ingot. Times, you can remove the coarse-grained structure.
At the tail end of the ingot, the grain structure is still a fine equiaxed grain structure, which is mainly manifested as loose ingot structure and high hydrogen content. Due to the end of the casting process, the amount of molten metal in the furnace is low, the temperature is low, and the fluidity is poor. When the casting speed is appropriately reduced, it is difficult for the alloy solution to completely supplement the fine and dispersed pores produced by the volume shrinkage of the alloy in the liquid state and the solidified state, so that the macroscopic and microscopic shrinkage porosity are formed. The tail sawing length is controlled at 1.5 times the diameter of the ingot. Only cutting head and tail waste can ensure product quality.
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