Composite treatment method of regenerated deformed aluminum alloy melt

A technology of deformed aluminum alloy and composite treatment, applied in the direction of improving process efficiency, can solve problems such as performance decline, process yield reduction, complex composition, etc., and achieve the effect of reducing crack sources, broadening industrial applications, and comprehensive mechanical properties.

Active Publication Date: 2020-07-14
QINGYUAN ZHENGTONG METAL PROD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After remelting and recycling, its composition is complex, which leads to a great tendency of thermal cracking in

Method used

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  • Composite treatment method of regenerated deformed aluminum alloy melt
  • Composite treatment method of regenerated deformed aluminum alloy melt
  • Composite treatment method of regenerated deformed aluminum alloy melt

Examples

Experimental program
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Embodiment 1

[0054] Preparation of 6xxx series regenerated deformed aluminum alloy treated with Mg / Sr / C-containing refining agent: According to the method of Comparative Example 1, melted 6xxx series recycled scrap aluminum after preliminary screening, the initial basic composition is the same as that of Comparative Example 1, stripped off The slag is kept warm and kept for 20 minutes. Add Mg ingot, Al-10Sr modifier and Al-5Ti-0.3B-0.2C refiner to the melt, keep the melt temperature at 720℃, stir evenly after melting, keep it at rest for 20 minutes; among them, Al-10Sr is degraded The addition amount of the agent is 0.6% of the melt mass, and the addition amount of Al-5Ti-0.3B-0.2C refiner is 0.7% of the melt mass. After the Mg ingot is added, the mass percentage of Mg in the melt is adjusted to 1.2%. The melt was refined and slag-removed according to the method of Comparative Example 1, and the refining and slag-removed melt was cast into an ingot. Subsequently, the ingot was placed in a...

Embodiment 2

[0057] Preparation of 6xxx series regenerated deformed aluminum alloy treated with Mg / Sr / C-containing refining agent: The preparation method of this embodiment 2 is similar to that of embodiment 1, except for the Mg ingot, Al-10Sr modifier and Al The addition amount of -5Ti-0.3B-0.2C refiner is different. In this example 2, the amount of Al-10Sr modifier added is 0.6% of the melt mass, and the amount of Al-5Ti-0.3B-0.2C refiner added is 0.3% of the melt mass. Mg ingots are added and melted. The mass percentage of Mg in the body is adjusted to 1.0%.

[0058] The optical microstructure of the regenerated deformed aluminum alloy prepared in this example is similar to the microstructure of the regenerated deformed aluminum alloy prepared in Example 1, but the eutectic structure of this example is reduced, and needle-like dendrites are broken. In the as-cast state, the thermal crack sensitivity coefficient HTS of the alloy of this example is 130, the tensile strength is 207.3 MPa, th...

Embodiment 3

[0060] Preparation of 6xxx series regenerated deformed aluminum alloy treated with Mg / Sr / C-containing refining agent: The preparation method of this embodiment 3 is similar to that of embodiment 1, except that Mg ingot, Al-10Sr modifier and Al The addition amount of -5Ti-0.3B-0.2C refiner is different. In Example 3, the addition amount of Al-10Sr modifier is 0.2% of the melt mass, and the addition amount of Al-5Ti-0.3B-0.2C refiner is 0.5% of the melt mass. The Mg ingot is added and melted. The mass percentage of Mg in the body is adjusted to 1.2%.

[0061] The optical microstructure of the regenerated deformed aluminum alloy prepared in this example is similar to that of the regenerated deformed aluminum alloy prepared in Example 1. The grains are refined, and the eutectic structure is distributed in dots or blocks at the grain boundaries. around. In the as-cast state, the thermal crack sensitivity coefficient HTS of the alloy of this example is 126, the tensile strength is 21...

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Abstract

The invention discloses a composite treatment method of a regenerated deformed aluminum alloy melt. The composite treatment method mainly comprises the following steps of carrying out composite treatment on a 6xxx-series regenerated aluminum alloy melt by using Mg, Sr and a C-containing refiner to change the form and distribution of a second phase of the alloy, so that a needle-like impurity phaseis converted into a Chinese character shape, and an eutectic structure is uniformly distributed; and meanwhile, grains are refined, and the alloy solidification mode is changed. After the composite treatment, the ingot casting heat crack sensitivity of the regenerated deformed aluminum alloy is obviously reduced, the reduction rate is up to 32%, the comprehensive mechanical property is also obviously improved, the tensile strength is maximally improved by 35%, and the hardness is maximally improved by 45%.

Description

Technical field [0001] The invention relates to the technical field of composite treatment of regenerated deformed aluminum alloy melts, and in particular to a composite treatment method capable of reducing the thermal cracking sensitivity of 6xxx series regenerated deformed aluminum alloy ingots and improving its comprehensive mechanical properties. Background technique [0002] Aluminum and aluminum alloys have the characteristics of small specific gravity, good electrical conductivity, good heat dissipation performance, high specific strength and easy processing. They have been more and more used in the fields of automobiles, transportation, aviation, etc., and have become an indispensable foundation of the national economy. Sexual raw materials. On the one hand, the rapid development of the national economy has continuously increased the demand for aluminum products. On the other hand, large quantities of aluminum materials reach the service life every year, resulting in the ...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C1/06C22C21/00C22F1/04C22B7/00
CPCC22B7/001C22C1/026C22C1/03C22C1/06C22C21/00C22F1/04Y02P10/20
Inventor 何健松杜军史明波周炳坚何杏霖
Owner QINGYUAN ZHENGTONG METAL PROD CO LTD
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