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Method for improving metallurgical quality of large-specification 2000 series aluminum alloy cast ingot

An aluminum alloy ingot and aluminum alloy technology, applied in the field of alloy casting, can solve problems such as the unreported casting method of 2000 series aluminum alloy ingot, ingot composition segregation, and ingot cracking, so as to avoid ingot cracking and reduce The degree of composition segregation and the effect of improving the casting molding rate

Active Publication Date: 2021-06-18
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large size of the ingot, it is very easy to cause problems such as composition segregation, microporosity, and ingot cracking of the ingot.
[0003] At present, there is no report on the casting method of high-quality large-scale 2000 series aluminum alloy ingots

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] When smelting 2024 aluminum alloy slab ingots, ingredients are prepared according to the ingredients in Table 1. The smelting process adopts the conventional smelting process and parameters of 2000 series aluminum alloys, and aluminum ingots, magnesium ingots, and Al-50%Cu and Al-10%Mn intermediate alloys are selected. , Melt aluminum ingots, Al-50%Cu, Al-10%Mn intermediate alloys at 660°C with the furnace heating up, after all are melted, press magnesium ingots into the melt at 690°C, overheat at 740°C for 15 minutes, then cool down to 710°C ℃, inert gas is introduced into the smelting furnace, refining and degassing is carried out with standing furnace bottom permeable bricks, followed by slag removal and standing treatment, and then online degassing and refining through SNIF high-efficiency dual rotors, and through 30PPI+50PPI two-stage After the ceramic foam plate is filtered, it is ready for casting.

[0045] Casting starts when the temperature of the molten alumin...

Embodiment 2

[0050] When smelting 2219 aluminum alloy round ingots, the ingredients are prepared according to the composition in Table 1. The smelting process adopts the conventional smelting process and parameters of 2000 series aluminum alloys. Aluminum ingots and Al-50%Cu and Al-10%Mn intermediate alloys are selected. Heat up the furnace to melt aluminum ingots, Al-50%Cu, and Al-10%Mn intermediate alloys. After they are all melted, they are overheated at 740°C for 15 minutes, then cooled to 710°C, and inert gas is introduced into the melting furnace. The permeable bricks are refined and degassed, followed by slag removal and static treatment, and then online degassing and refining through SNIF high-efficiency dual rotors, and filtered through 30PPI+50PPI dual-stage foam ceramic plates, and are ready for casting.

[0051] Casting begins when the temperature of the molten aluminum reaches 700°C, and ultrasonic and electromagnetic waves are applied to the molten aluminum in the front tank. ...

Embodiment 3

[0056] When smelting 2029 aluminum alloy slab ingots, ingredients are prepared according to the ingredients in Table 1. The smelting process adopts the conventional smelting process and parameters of 2000 series aluminum alloys, and aluminum ingots, magnesium ingots, pure silver, and Al-50%Cu and Al-10%Mn are selected. , Al-50%Zr master alloy, melt high-purity aluminum ingot, Al-50%Cu, Al-10%Mn, Al-50%Zr master alloy at 660°C with furnace heating, after all melting, 690°C into the melt Press in magnesium ingots and pure silver, overheat at 740°C for 15 minutes, then cool down to 710°C, pass inert gas into the smelting furnace, use standing furnace bottom ventilation bricks for refining and degassing, and then carry out slag removal and static treatment. After that, the online degassing refining is carried out through the SNIF high-efficiency dual rotors, and after filtering through the 30PPI+50PPI two-stage foam ceramic plate, it is ready for casting.

[0057] Casting begins w...

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Abstract

The invention provides a method for improving the metallurgical quality of a large-specification 2000 series aluminum alloy ingot, and is suitable for a large-specification flat ingot with the size of 520mm (thickness) x 1620mm (width) and a large-specification round ingot with a diameter of 1000mm. The method comprises the following steps of: jointly applying ultrasonic waves and electromagnetic waves to molten aluminum (such as molten aluminum in a front groove) during casting; and selecting ultrasonic frequency, coupling parameters of electromagnetic waves, casting temperature, casting speed and water flow according to alloy components. According to the method, the casting stress of the large-specification cast ingot can be effectively reduced, cracks are reduced, the composition segregation degree of the cast ingot is reduced, microporosity is reduced, the cast ingot is prevented from cracking, and the casting forming rate is increased.

Description

technical field [0001] The invention belongs to the technical field of alloy casting and relates to a method for improving the metallurgical quality of large-scale 2000 series aluminum alloy ingots (including flat ingots and round ingots). Background technique [0002] The 2000 series aluminum alloy belongs to the Al-Cu alloy system. It has high comprehensive properties such as high strength, high toughness, damage resistance, and corrosion resistance. It is one of the commonly used metal materials in the aviation industry. It is mainly used for aircraft fuselage skin, Wing skins and other parts that require high damage resistance. As the size of the aircraft increases and the demand for integral structural parts increases, the fuselage / wing skin is often required to be manufactured with an integral structure, which requires an increasing size of the 2000 series aluminum alloy ingot, among which the required plate The maximum size of the cross-section of the flat ingot re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/11B22D1/00B22D11/16B22D43/00C22C21/16
CPCB22D1/00B22D11/003B22D11/11B22D11/16B22D43/004C22C21/16
Inventor 何维维臧金鑫戴圣龙王亮
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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