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Method for controlling microstructure of recycled aluminum alloy

A microstructure and control method technology, applied in the field of recycled metals, can solve the problems of low product quality, unsatisfactory microstructure, high content, etc., and achieve the effect of optimizing the deformed structure

Inactive Publication Date: 2018-12-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of high content of gas and inclusions, unsatisfactory microstructure, and low product quality in secondary aluminum alloys, the present invention provides a method for controlling the microstructure of secondary aluminum alloys, which can control the microstructure of secondary aluminum alloys and eliminate pores , inclusions and other defects

Method used

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  • Method for controlling microstructure of recycled aluminum alloy
  • Method for controlling microstructure of recycled aluminum alloy
  • Method for controlling microstructure of recycled aluminum alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Waste miscellaneous aluminum was smelted at 650°C for 300 minutes to obtain aluminum alloy melt, and the scum on the surface was removed, and then the online composition of the aluminum alloy melt was adjusted to 2024 aluminum alloy composition, and then refined. Refining includes degassing and deterioration, the refining temperature is 700°C, and the refining time is 60 minutes. Will N 2The mixed gas with Ar volume ratio of 5:1 is passed into the aluminum alloy melt, and the gas in the melt is removed by the bubble flotation method, the gas flow rate is 1L / min, and the pressure is 0.12MPa; the aluminum alloy melt after degassing Add 0.5kg / t of Al-Ti-B modifier to refine the grain. After refining, the hydrogen content is 0.02ml / 100gAl, and the inclusions in the metallographic field are 0.4area%. The metamorphic aluminum alloy melt is filtered through a ceramic filter plate with a pore size of 10 mesh to remove inclusions and then cast into an ingot with an average gra...

Embodiment 2

[0040] Waste miscellaneous aluminum was smelted at 700°C for 250 minutes to obtain aluminum alloy melt, and the scum on the surface was removed, and then the online composition of the aluminum alloy melt was adjusted to 2024 aluminum alloy composition, and then refined. Refining includes degassing and deterioration, the refining temperature is 750°C, and the refining time is 50 minutes. Will N 2 The mixed gas with Ar volume ratio of 2:1 is passed into the aluminum alloy melt, and the gas in the melt is removed by the bubble flotation method, the gas flow rate is 3L / min, and the pressure is 0.20MPa; the aluminum alloy melt after degassing Add 1.0kg / t of Al-Ti-C modifier to refine the grain. After refining, the hydrogen content is 0.05ml / 100gAl, and the inclusions in the metallographic field of view are 0.4area%. The modified aluminum alloy melt is filtered through a ceramic filter plate with a pore size of 20 mesh to remove inclusions and then cast into an ingot. The average ...

Embodiment 3

[0042] Waste miscellaneous aluminum was smelted at 750°C for 200 minutes to obtain an aluminum alloy melt, and the scum on the surface was removed, and then the online composition of the aluminum alloy melt was adjusted to 2024 aluminum alloy composition, and then refined. Refining includes degassing and deterioration, the refining temperature is 800°C, and the refining time is 40 minutes. Will N 2 The mixed gas with a volume ratio of 1:1 to Ar is passed into the aluminum alloy melt, and the gas in the melt is removed by the bubble flotation method, the gas flow is 6L / min, and the pressure is 0.25MPa; the aluminum alloy melt after degassing Add 1.5kg / t of mixed modifier of Al-Ti-B and Al-Ti-C to refine the grain. After refining, the hydrogen content is 0.10ml / 100gAl, and the inclusions in the metallographic field of view are 0.5area%. The modified aluminum alloy melt is filtered through a ceramic filter plate with a pore size of 30 mesh to remove inclusions and then cast int...

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Abstract

The invention mainly belongs to the technical field of secondary metals, and particularly relates to a method for controlling the microstructure of a recycled aluminum alloy. The method for controlling the microstructure of the recycled aluminum alloy comprises the following steps that gas and inclusions in an aluminum alloy melt are removed, crystal grain refining is carried out, and deformed structure controlling is carried out; and an air bubble floating method is adopted to remove the gas of the aluminum alloy melt, a filtration method is adopted to remove the inclusions of the aluminum alloy melt, modificator is added to refine an aluminum alloy ingot structure, and extrusion or rolling or forging is adopted to control an aluminum alloy section structure, an aluminum alloy product with a good microstructure is achieved. The method for controlling the microstructure of the recycled aluminum alloy has good degassing and impurity removal effects, the hydrogen content after refining is 0.02-0.26 ml / 100 gAl, and the inclusions in the metallographic phase filed is 0.4-0.7 area%; the average grain size of an as-cast structure of the aluminum alloy is 25-50[mu]m, and a second phase isshort rod-shaped or elliptical particles with10-100nm; and the grain length-diameter ratio of a deformed structure of the aluminum alloy is 10:1-100:1, and a second phase is short rod-shaped or elliptical particles with 5-80 nm.

Description

technical field [0001] The invention mainly belongs to the technical field of recycled metals, and in particular relates to a method for controlling the microstructure of recycled aluminum alloys. Background technique [0002] Aluminum and aluminum alloys are widely used in various fields due to their excellent mechanical properties, processing properties, and recyclability. The leftovers, scrapped products and waste products that have completed the service life of aluminum and aluminum alloy products are collectively referred to as scrap aluminum, including process scraps, scrapped aircraft aluminum alloys, scrapped automotive aluminum alloys, scrap aluminum cans, scrap aluminum alloy doors and windows, etc. . As energy, resource and environmental issues become increasingly prominent, the resource and environmental protection value of scrap aluminum is increasing day by day, the secondary aluminum industry has received more and more global attention, and the output of seco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/06C22F1/04
CPCC22C1/026C22C1/06C22F1/04C22C21/00
Inventor 张深根刘波兰雪影
Owner UNIV OF SCI & TECH BEIJING