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A kind of manufacturing method of aluminum alloy flat ingot for aviation

A manufacturing method and aluminum alloy technology, which is applied in the field of aviation aluminum alloy flat ingot and its manufacture, can solve the problems of low ingot yield and flaw detection pass rate, etc., and achieve the effect of improving the ingot yield

Active Publication Date: 2018-07-13
NORTHEAST LIGHT ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem of low yield of aluminum alloy flat cast ingots produced by existing methods due to surface crack defects and low pass rate of flaw detection, and provides an aluminum alloy flat cast ingot for aviation and its manufacturing method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0013] Specific Embodiment 1: In this embodiment, the flat cast ingot of aluminum alloy for aviation is composed of Si < 0.12%, Fe < 0.15%, Cu 1.9% to 2.5%, Mn < 0.10%, and Mg 2.0% to 2.7%. , Cr<0.04%, Ni<0.05%, Zn 5.9%-6.9%, Zr 0.08%-0.15%, Ti<0.06% and the balance of high-purity aluminum ingots are manufactured as smelting raw materials.

[0014] The content of Mg and Zn in the aluminum alloy slab ingot for aviation obtained by proportioning the raw materials in this embodiment is relatively high. Zn is 5.9% to 6.9%, Mg is 2.0% to 2.7%, and the Zn / Mg ratio is close to 3. The effects of Zn, Mg and Cu on the effect of heat treatment are different. Increasing the concentration of Zn and Mg can improve the quenching and aging effects at the same time, and the strengthening phase MgZn is mainly formed in the alloy 2 . MgZn 2 The solubility of the phase in the alloy decreases sharply with the decrease of temperature, and it has a strong age hardening ability. Within the range...

specific Embodiment approach 2

[0017] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the aviation aluminum alloy slab is Si<0.12%, Fe<0.15%, Cu: 2.10%, Mn<0.10%, Mg: 2.4%, Cr<0.04%, Ni<0.05%, Zn: 6.5%, Zr: 0.11%, Ti<0.06% and the rest of high-purity aluminum ingots are manufactured from smelting raw materials; the high-purity aluminum ingots mentioned The purity is 99.996%. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0018] Specific implementation mode three: the manufacturing method of the aviation aluminum alloy slab ingot in this implementation mode is realized according to the following steps:

[0019] 1. According to mass percentage, Si<0.12%, Fe<0.15%, Cu is 1.9%~2.5%, Mn<0.10%, Mg is 2.0%~2.7%, Cr<0.04%, Ni<0.05%, Zn is 5.9% ~6.9%, Zr is 0.08%~0.15%, Ti<0.06% and the proportion of high-purity aluminum ingots with the balance, high-purity aluminum ingots, metal Cu, metal Mg, metal Zn and Al-5Zr master alloy are weighed as smelting raw materials;

[0020] 2. Add the smelting raw materials weighed in step 1 into the resistance reverberatory furnace for melting. The order of adding the smelting raw materials is: first add high-purity aluminum ingots, then add metal Cu and metal Zn, then add Al-5Zr intermediate alloy, wait Add metal Mg when the melt temperature is 700-720°C, then stir at 720-760°C for 10-15 minutes, sample and analyze the chemical composition, and cover with flux to obt...

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Abstract

The invention discloses an aluminum alloy slab ingot for aviation and a manufacturing method thereof, and relates to an aluminum alloy slab ingot material and the manufacturing method. The problem of low finished product rate of ingots caused by surface cracking defect and flaw detection pass rate of the aluminum alloy slab ingot manufactured by adopting the existing method is solved. The aluminum alloy slab ingot for aviation is prepared from Si, Fe, Cu, Mn, Mg, Cr%, Ni, Zn, Zr, Ti and the balance of high-purity aluminum used as melting raw materials. The method comprises the steps: 1, weighing the melting raw materials; 2, melting the melting raw materials according to sequences; 3, putting the alloy melt into a resistance reflecting furnace to carry out casting to obtain the aluminum alloy slab ingot. By adopting combination of existing casting process and scientific proportions of the raw materials and refined operation in the production process, the crack defect of the ingot can be reduced, and a relatively pure melt can be obtained, so that the finished product rate of the ingot can reach 86%. The aluminum alloy slab ingot and the manufacturing method thereof can be applied to the field of manufacturing of the aluminum alloy slab ingots.

Description

technical field [0001] The invention relates to an aluminum alloy flat casting ingot for aviation and a manufacturing method thereof. Background technique [0002] This product belongs to Al-Zn-Mg-Cu super duralumin, which has high strength, good fracture toughness, stress corrosion resistance and spalling resistance, good quenching sensitivity, compressive stress and other advantages. Its thick plate It is widely used in wing skin parts. However, due to the complex chemical composition and phase composition of this alloy, it shows a great tendency to crack during casting, and the range of melting and casting process parameters is extremely narrow. Low, the ingot yield is only 60%, so through the control of the alloy composition and process parameters, thereby reducing the crack tendency of the slab ingot, solving the crack defect on the surface of the ingot and improving the purity of the melt, so as to improve the quality of the ingot Yield. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22C1/03C22C1/06B22D11/117B22D11/119B22D11/11
CPCB22D11/003B22D11/11B22D11/117B22D11/119C22C1/026C22C1/03C22C1/06C22C21/10
Inventor 殷云霞李海仙刘洪王金花高新宇黄岩超马月姜德俊张珺玲王殿坤孙庆福
Owner NORTHEAST LIGHT ALLOY CO LTD
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