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Preparation method of aluminum lithium alloy ingot

An aluminum-lithium alloy and ingot casting technology, which is applied in the field of aluminum alloys, can solve problems such as cracking, high risk of ingot cracking, and easy oxidation

Active Publication Date: 2015-01-28
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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  • Preparation method of aluminum lithium alloy ingot
  • Preparation method of aluminum lithium alloy ingot
  • Preparation method of aluminum lithium alloy ingot

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preparation example Construction

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

[0022] a) Melting the smelting raw material, the melted composition of the smelting raw material 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 sampling before the furnace, adjust the composition according to the composition results before the furnace, and then carry out vacuum refining after the adjustment;

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

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

Embodiment 1

[0037] 1. Calculate the ingredients, determine the length of the ingot to be 3500mm according to the requirements of the issued production task, consider the oxidation and burning loss of 5%, the specification of the large-scale ingot is 420×1400mm, and the density of the alloy is assumed to be 2700kg / m 3 , then calculate the total feeding amount = 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 (wt%) of the aluminum-lithium alloy of this embodiment

[0039]

[0040] Notice:

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

[0042] ② In order to refine the grain and prevent the ingot from cracking, generally add 0.04% Ti element

[0043] ③ When the aluminum-lithium alloy is prepared, the Cu element is added as a pure Cu plate, the Mn element is added as an Al-Mn in...

Embodiment 2

[0078] 1. Calculation. Determine the length of the ingot to be 3500mm according to the requirements of the issued production task. Considering the oxidation and burning loss of 5%, the specification of the large-scale ingot is 420×1400mm, and the density of the alloy is assumed to be 2700kg / m 3 , then calculate the total feeding amount = 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 (wt%) of the aluminum-lithium alloy of this embodiment

[0080]

[0081] Notice:

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

[0083] ② In order to refine the grain and prevent the ingot from cracking, generally add 0.04% Ti element

[0084]③ When the aluminum-lithium alloy is prepared, the Cu element is added as a pure Cu plate, the Mn element is added as an Al-Mn intermediate a...

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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 an aluminum-lithium alloy ingot. Background technique [0002] Lithium is the lightest metal element in the world. Adding lithium as an alloy element to metal aluminum forms an aluminum-lithium alloy. Adding lithium to the aluminum alloy can reduce the specific gravity of the alloy, increase the stiffness, and still maintain high strength, good corrosion resistance, fatigue resistance and suitable ductility, so aluminum-lithium alloys are widely used in aviation, aerospace and The extensive 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 difficult than ordinary alloys. This is becau...

Claims

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Application Information

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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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