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Casting process of 7475 aluminium alloy slab ingot

A technology of aluminum alloy and flat ingot, which is applied in the field of aluminum alloy casting, can solve problems such as cracks and porosity easily, and achieve the effect of improving the purity of the melt, preventing cracks, and strengthening grain refinement

Inactive Publication Date: 2014-02-12
JIANGSU JIANGXU CASTING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, cracks and loose defects are prone to occur during casting of 7475 aluminum alloy flat ingots

Method used

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Examples

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Embodiment Construction

[0011] (1) For ingredients, use this alloy’s primary scrap ≤ 30%, pure aluminum ingot ≥ 30%, the Cu, Mg, Zn required in the alloy are added in the form of pure metal, and Cr is added in the form of Al-Cr intermediate alloy, which is not allowed to be used Compounding materials and additives, control Si<0.25wt%, Fe<0.1wt%, Cu: 1.3-1.5wt%, Mn≤0.20wt%, Zn: 5.2-5.8wt%, Mg: 2.3-2.8wt% , Ti≤0.10wt%, Cr content is added according to the middle limit;

[0012] Impurity Fe can form some coarse compounds with other elements, affecting the strength and plasticity of the alloy. The negative effect of Si is greater than that of Fe. With the increase of Si content, the hot brittleness of the alloy increases sharply. Therefore, control Fe<0.1wt%, Si< 0.25wt%;

[0013] Through multiple tests, the crack tendency decreases with the increase of Mg content. Therefore, in the case of little impact on performance, the Mg content should be increased as much as possible, and Mg should be controlled...

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Abstract

The invention relates to a casting process for a 7475 aluminium alloy slab ingot. By the control to chemical components, regulation of the casting stress, improvement on melt purity, strengthening of grain refinement and the like, the defects of cracks and loosening of the 7475 aluminium alloy slab ingot in the casting process are prevented.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy casting, and in particular relates to a 7475 aluminum alloy flat ingot melting and casting process. Background technique [0002] 7475 aluminum alloy is used to produce aerospace structural parts, which are required to have high strength, high toughness, fatigue resistance, corrosion resistance and other properties, and the final products are required to pass Class A flaw detection inspection and fracture oxide film inspection. In order to ensure the performance and service life of alloy products, in the melting and casting stage, in addition to requiring good casting and forming, the main components should be strictly controlled to reduce the impurity content and ensure the high purity of the metal. [0003] At present, cracks and loose defects are prone to occur during casting of 7475 aluminum alloy flat ingots. Contents of the invention [0004] The object of the present invention is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06B22D27/04B22D27/20B22D7/00
Inventor 潘敏徐军赵金生徐伟侯文洪盛积
Owner JIANGSU JIANGXU CASTING GROUP
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