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Process capable of improving mechanical properties of A356.2 aluminum alloy

A process method and aluminum alloy technology, which is applied in the field of non-ferrous metal materials and their preparation and forming, can solve problems such as increased production costs, achieve short processing time, meet performance requirements, and significantly improve the effect

Inactive Publication Date: 2018-11-16
SHANDONG HUAYU ALUMINUM & POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For aluminum parts that require higher performance, usually only aluminum alloy forgings can be considered, and the production cost will be greatly increased

Method used

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  • Process capable of improving mechanical properties of A356.2 aluminum alloy
  • Process capable of improving mechanical properties of A356.2 aluminum alloy
  • Process capable of improving mechanical properties of A356.2 aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A process method that can improve the mechanical properties of A356.2 aluminum alloy includes the following steps:

[0029] (1) Use crucible resistance furnace to smelt A356.2 aluminum alloy ingot, first fully preheat and dry the crucible, then add the weighed A356.2 aluminum alloy ingot and continue heating and melting. When the temperature of the molten aluminum reaches 740℃, add 0.6% by weight of Al-3B refiner and 0.3% by weight of Al-10Sr modifier, add Al-3B and Al-10Sr When using aluminum foil to wrap it and press it into the aluminum liquid level and gently stir.

[0030] (2) After the Al-3B and Al-10Sr alloys are melted, argon gas with a purity of ≥99.99% is passed into the melt for degassing and refining, the temperature is 725°C, and the degassing time is 10 minutes. After degassing and refining, let it stand for 20 minutes to remove scum on the surface of the melt. Control the melt temperature to 710°C during the standing process. A batch of φ8mm standard tensil...

Embodiment 2

[0034] The production process of the A356.2 alloy of Example 2 of the present invention is the same as that of Example 1, but the weight of the Al-3B alloy added in step (1) is 0.5% of the total weight, and the A356.2 alloy obtained in Example 2 The sample is marked as A2.

Embodiment 3

[0036] The production process of the A356.2 alloy of Example 3 of the present invention is the same as that of Example 1, but the refiner added in step (1) is Al-3Ti-3B alloy, and the A356.2 alloy sample obtained in Example 3 Marked as A3.

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Abstract

The invention discloses a process capable of improving the mechanical properties of an A356.2 aluminum alloy. The process comprises following main steps: a melt combined modification-refinement treatment after alloy melting, casting, solid solution, and a double stage aging heat treatment. Specifically, the process comprises following steps: (1) heating and melting A356.2 aluminum alloy, and adding a refining agent and a modifying agent to process the melt; (2) removing gas from the alloy melt, refining the alloy melt, allowing the alloy melt to stand still, removing the slag, and carrying outcasting to obtain a casting; (3) maintaining the temperature of the casting in a range of 530 to 550 DEG C for 4 to 8 hours, and carrying out quenching by using water with a temperature of 20 to 80 DEG C; and (4) maintaining the temperature of the casting in a range of 100 to 120 DEG C for 0.5 to 2 hours, then maintaining the temperature of the casting in a range of 165 to 185 DEG C for 2 to 6 hours, taking out the casting out of a furnace, and cooling the casting in the air. After processing, the mechanical properties of the A356.2 aluminum alloy are obviously enhanced, the yield strength isimproved by 40 to 50%, and the elongation rate is increased by 20 to 40%.

Description

Technical field [0001] The invention relates to a process for improving the mechanical properties of A356.2 aluminum alloy, and belongs to the field of non-ferrous metal materials and their preparation and forming. Background technique [0002] A356 (AlSi7Mg0.3) aluminum alloy has been widely used in automobiles, rail transit, aviation, aerospace and other fields due to its good casting formability and mechanical properties. Especially in the automobile industry, wheel hubs, steering knuckles, brakes, etc. Cast aluminum parts such as calipers are usually made of A356 alloy. A356.2 alloy strictly controls the Fe content (≤0.12%) and impurity elements, and is used as a raw material for the production of A356 alloy castings with high strength and toughness requirements. For castings produced with A356.2 alloy, even if the production process is properly controlled, the yield strength after T6 heat treatment is still <200MPa and the elongation is only 3 to 6%. By adding Al-S...

Claims

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Application Information

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IPC IPC(8): C22C1/06C22C1/03C22C21/04C22F1/043
CPCC22C1/026C22C1/03C22C1/06C22C21/04C22F1/043
Inventor 高喜柱邹纯王际海钟鼓李志强邱楚李德杰张保存徐杰于恒章王磊孙瑞霞
Owner SHANDONG HUAYU ALUMINUM & POWER
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