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Manufacturing method of ultrahard aluminium alloy

A manufacturing method and technology of hard aluminum alloy, applied in the field of manufacturing process of aluminum alloy, can solve the problems of many oxide films in ingots, affecting the force-bearing section area of ​​the plate, and reducing the performance of the plate.

Active Publication Date: 2009-06-03
NORTHEAST LIGHT ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the 25-ton new production line produced aluminum alloy ingots according to conventional processes not only have a greater tendency to crack, but also have more oxide films in the ingots.
The oxide film in the ingot is a relatively small defect that destroys the continuity of the metal caused by gas and non-metallic inclusions. Although it does not cause cracks in the ingot, it will be elongated and the area will increase during the press process. When it reaches a certain level, it will affect the stress-bearing cross-sectional area of ​​the plate, generate stress concentration, and significantly reduce the performance of the plate (σ b =213.58N / mm 2 , Φ=6.0%)

Method used

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specific Embodiment approach 1

[0004] Specific embodiment 1: The method of this embodiment is realized in the following way: First, the ingredients are prepared: the superhard aluminum alloy is composed of the following mass percentages: Fe2 The mixed gas is refined for 20-30 minutes, and the standing time is not less than 30 minutes. Then, it is cast at the same level by the semi-continuous casting method at 720°C to make alloy ingots. The pulse water control is adopted at the beginning of the casting, the pulse water stops when the casting length is 170-250mm, and the water barrier is pressed tightly when the casting length is 350mm; the casting speed is 60-70mm / min; the mold metal liquid level is 70mm; the cooling water The flow rate is 65~72m 3 / h; ALPUR online degassing is used during the casting process, and the filter uses a 30PPI ceramic plate as the filter element, and a layer of filter screen is added between the variable diameter launder and the distribution launder. Ar-Cl 2 The volume ratio of ...

specific Embodiment approach 2

[0005] Specific embodiment two: In this embodiment, the pulse water is stopped when the casting length is 180mm, the casting speed is 62mm / min, and the cooling water flow rate is 67m 3 / h.

specific Embodiment approach 3

[0006] Specific embodiment three: In this embodiment, the pulse water is stopped when the casting length is 240mm, the casting speed is 68mm / min, and the cooling water flow rate is 70m 3 / h.

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Abstract

A process for preparing the ultra-hard Al-alloy includes such steps as proportionally mixing raw materials in such manner that Fe / Si=2-3, Mg(2.5-5%) and CutMg+Zn is less than or equal to 9.6%, smelting at 700-730 deg.C, refining by Ar-Cl2 mixture, laying aside, and horizontal casting.

Description

Technical field: [0001] The invention relates to a manufacturing process of aluminum alloy. Background technique: [0002] Adding a relatively high content of zinc to the existing aluminum alloy forms a high-zinc alloy with high strength and hardness. Adding a small amount of copper to the alloy can effectively improve the ability to resist stress corrosion. However, the aluminum alloy ingots produced by the conventional process on the 25-ton new production line not only have a greater tendency to crack, but also have more oxide films in the ingots. The oxide film in the ingot is a relatively small defect that destroys the continuity of the metal caused by gas and non-metallic inclusions. Although it does not cause cracks in the ingot, it will be elongated and the area will increase during the press process. When it reaches a certain level, it will affect the stress-bearing cross-sectional area of ​​the plate, generate stress concentration, and significantly reduce the perf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/00C22C1/02C22C1/06C22C21/10B22D7/00
Inventor 钟利吴欣凤单长智王德满周庆波潘永富郝志刚王贵福李海仙
Owner NORTHEAST LIGHT ALLOY CO LTD
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