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A kind of preparation method of aluminum-lithium alloy ingot

An aluminum-lithium alloy and ingot casting technology, applied in the field of aluminum alloys, can solve the problems of insufficient deformation, slag inclusion, and difficulty in meeting the fracture toughness index of the fiber structure.

Active Publication Date: 2017-02-15
SOUTHWEST ALUMINUM GRP
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Problems solved by technology

[0003] Although the addition of lithium can reduce the specific gravity of the alloy, the metallurgical quality and casting molding of aluminum-lithium alloys are more difficult than ordinary alloys
This is because lithium is one of the most active metal elements in chemical properties. Adding lithium to aluminum alloy will cause problems such as oxidation, hydrogen absorption, and slag inclusion in the aluminum-lithium alloy during the smelting process; at the same time, it will increase the casting time of the alloy. The solidification temperature range, which leads to cracking after solidification and even pre-annealing, especially when the ingot size is large, the risk of ingot cracking is greater, and the requirements for safety risk prevention measures are higher
Therefore, due to the particularity of the smelting of aluminum-lithium alloys, it is not yet possible to carry out online refining treatment like ordinary aluminum alloys in China.
[0004] At the same time, when the aluminum-lithium alloy ingot must be processed into a thick plate through a certain amount of deformation, its internal nearly equiaxed as-cast structure can be transformed into a fibrous structure that meets a certain fracture toughness index. If the amount of deformation is not enough, the transformed fiber It is difficult for the organization to meet a certain fracture toughness index
At present, the specifications of aluminum-lithium alloy industrialized ingots are small. For some thick plates, the amount of deformation is not enough, and the performance indicators such as fracture toughness cannot meet the requirements.

Method used

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  • A kind of preparation method of aluminum-lithium alloy ingot
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  • A kind of preparation method of aluminum-lithium alloy ingot

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preparation example Construction

[0021] The embodiment of the invention discloses a method for preparing an aluminum-lithium alloy ingot, which includes the following steps:

[0022] a) Melting the smelting raw material, the composition of the smelting raw material after melting includes: 0-0.12wt% Si, 0-0.15wt% Fe, 2.4-4.6wt% Cu, 0-0.5wt% Mn, 0~0.8wt% Mg, 0~0.05wt% Cr, 0~0.05wt% Ni, 0~0.25wt% Zn, 0~0.15wt% Ti, 0.04~0.18wt% Zr, 0.7wt %~2.6wt% Li, 0.2wt%~0.7wt% Ag and the balance Al;

[0023] b) Refining the melted raw materials to obtain a melt;

[0024] c) Transfer the melt to the holding furnace for pre-furnace sampling, adjust the composition according to the composition results before the furnace, and perform vacuum refining after the adjustment is completed;

[0025] d) Casting the refined melt, the casting speed is 25mm / min~35mm / min, the water pressure of the casting is 0.02MPa~0.08MPa, and the temperature of the casting is 710℃~750℃;

[0026] e) annealing the aluminum-lithium alloy ingot obtained in step d) to...

Embodiment 1

[0037] 1. For the calculation of ingredients, determine the length of the ingot according to the requirements of the issued production task to determine the length of the ingot to be 3500mm, considering the oxidation burning loss of 5%, the size of the large ingot is 420×1400mm, and the alloy density is assumed to be 2700kg / m 3 , The total feeding amount is calculated = 0.38×1.4×3.5×(1+5%)×2700≈5280kg. Then calculate the input amount of each metal, the chemical composition control range and batching value of alloy A are shown in Table 1:

[0038] Table 1 The chemical composition data table of the aluminum-lithium alloy in this example (wt%)

[0039]

[0040] note:

[0041] ①The batching value is generally the middle value of the control range.

[0042] ②In order to refine the grains and prevent cracks in the ingot, generally add 0.04% Ti element

[0043] ③When preparing the aluminum-lithium alloy, Cu element is added as pure Cu plate, Mn element is added as 15% Al-Mn master alloy, Mg e...

Embodiment 2

[0078] 1. Calculate. Determine the length of the ingot according to the requirements of the issued production task to determine the length of the ingot to be 3500mm, considering the oxidation burn loss of 5%, the size of the large ingot is 420×1400mm, and the alloy density is assumed to be 2700kg / m 3 , The total feeding amount is calculated = 0.38×1.4×3.5×(1+5%)×2700≈5280kg. Then calculate the input amount of each metal, the chemical composition control range and batching value of alloy B are shown in Table 2:

[0079] Table 2 The chemical composition data table of the aluminum-lithium alloy in this embodiment (wt%)

[0080]

[0081] note:

[0082] ①The batching value is generally the middle value of the control range.

[0083] ②In order to refine the grains and prevent cracks in the ingot, generally add 0.04% Ti element

[0084] ③When preparing the aluminum-lithium alloy, Cu element is added as pure Cu plate, Mn element is added as 15% Al-Mn master alloy, Mg element is added as pure M...

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Abstract

The invention provides a preparation method of an aluminum lithium alloy ingot. The preparation method comprises the following steps: (a) melting raw materials for smelting; (b) refining the raw material after being melted to obtain a melt; (c) transferring the melt to a holding furnace for sampling before smelting, and then carrying out vacuum refining; (d) casting the melt after being refined, wherein the speed of casting is 25-35 mm / min, the water pressure of casting is 0.02-0.08 MPa, and the temperature of casting is 710-750 DEG C; (e) annealing an obtained aluminum lithium alloy ingot to obtain the aluminum lithium alloy ingot. The dimensions of the aluminum lithium alloy ingot prepared by the invention can reach (400-500) mm * (1200-1500) mm. Experimental results show that the breaking tenacity of the large-specification aluminum lithium alloy ingot prepared by the invention when the thickness is 100 mm is 32-35 MPa * m<1 / 2>.

Description

Technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a method for preparing aluminum-lithium alloy ingots. Background technique [0002] Lithium is the lightest metal element in the world. When lithium is added as an alloying element to metal aluminum, an aluminum-lithium alloy is formed. After adding lithium to the aluminum alloy, the specific gravity of the alloy can be reduced, the rigidity can be increased, while still maintaining higher strength, better corrosion resistance, fatigue resistance and suitable ductility. Therefore, aluminum-lithium alloys have been affected by aviation, aerospace and The wide attention of the navigation industry has attracted many scholars to study it, and the development of aluminum-lithium alloys has developed rapidly. [0003] Although the addition of lithium can reduce the specific gravity of the alloy, the metallurgical quality and casting molding of aluminum-lithium alloys are more difficu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/18C22C1/06B22D7/00C22F1/057
CPCB22D7/00C22C1/026C22C21/18C22F1/057
Inventor 姚勇王剑游文呙永林蒋呐向曙光杜荣刁文武田士
Owner SOUTHWEST ALUMINUM GRP
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