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Method for improving Fe content allowedness of high-strong and high-toughness aluminum alloy for automobile structural part

A technology for aluminum alloys and structural parts, applied in the field of aluminum alloys, can solve the problems of difficulty in stirring Fe phase uniformly, increase the preparation cost of aluminum-silicon alloys, etc., and achieve the effects of easy recycling, low cost, and easy recycling.

Active Publication Date: 2019-12-10
GUANGDONG HONGTUNANTONGDIE CASTING +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese patent (patent application publication number CN103820683A) discloses a method for multi-element composite refinement modification of Fe phase in high-Fe aluminum-silicon alloy, wherein the mass percentage of Fe is 0.8%~2.0%, by adding Al-Ti-C , Mn and RE combine Fe phase refinement and modification treatment in high-Fe aluminum-silicon alloy to reduce the harmful effect of Fe phase, but in this patent it is necessary to add Al-Ti-C, Mn and Ce+La mixture at the same time Rare earths increase the production cost of aluminum-silicon alloys; Chinese patent (patent application publication number CN108048679A) discloses a method for preparing aluminum alloys with high Fe content and refined Fe-rich precipitates, by adding metal elements Mn, Mg, Ca One or more of them, and then add grain refiner for modification, and add electromagnetic stirring, but because the stirring effect of the magnetic field on the aluminum alloy melt is not as strong as that on the black metal melt, it is difficult to stir the Fe phase evenly

Method used

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  • Method for improving Fe content allowedness of high-strong and high-toughness aluminum alloy for automobile structural part
  • Method for improving Fe content allowedness of high-strong and high-toughness aluminum alloy for automobile structural part
  • Method for improving Fe content allowedness of high-strong and high-toughness aluminum alloy for automobile structural part

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Experimental program
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Effect test

Embodiment 1

[0040] According to the mass percentage Mg: 0.2%, Si: 9.0%, Mn: 0.4%, Fe: 0.25%, Ti: 0.05%, Zn: 0.05%, Cu: 0.02%, Sr: 0.006%, the balance is Al alloy and Carry out smelting, add Al-Sr master alloy according to the Sr yield of 0.006% at 730 ° C, and pass argon gas into the melt at 710 ° C ~ 720 ° C for 10 minutes. After passing the argon gas, perform ultrasonic vibration Treatment, the vibration time is 3min, the frequency of ultrasonic vibration is 20-80kHz, the aluminum alloy melt is obtained after the vibration stops, the obtained aluminum alloy is die-casted, the casting temperature is 680°C, and the aluminum alloy is solid solution treated at 480°C for 5h, After water quenching, aging treatment at 170°C for 6 hours, the metallographic structure is as follows figure 2 shown.

Embodiment 2

[0042] According to mass percentage Mg: 0.2%, Si: 9.0%, Mn: 0.4%, Fe: 0.25%, Ti: 0.05%, Zn: 0.05%, Cu: 0.02%, Ce+La mixed rare earth: 0.1%, Sr: 0.006 %, the balance is Al to prepare the alloy and smelt it. When the melting temperature is ≥760°C, add Ce+La mixed rare earth to the melt, and press the mixed rare earth into the alloy liquid and stir evenly. When the temperature is 730°C, press The yield of Sr is 0.006% and Al-Sr master alloy is added. When the melt is 710℃~720℃, argon gas is introduced for 10 minutes. After the argon gas is passed, ultrasonic vibration treatment is carried out. The frequency of vibration is 20-80kHz. After the vibration stops, the aluminum alloy melt is obtained, and the obtained aluminum alloy is die-casted. The casting temperature is 680°C. The aluminum alloy is solid solution treated at 480°C for 5h, and after water quenching, it is aged at 170°C. Treated for 6h, its metallographic structure is as follows image 3 As shown, in order to compare...

Embodiment 3

[0044] According to mass percentage Mg: 0.3%, Si: 10.0%, Mn: 0.3%, Fe: 0.35%, Ti: 0.05%, Zn: 0.07%, Cu: 0.03%, Ce+La mixed rare earth: 0.30%, Sr: 0.01 %, the balance is Al sample preparation and smelting. When the melting temperature is ≥760°C, add Ce+La mixed rare earth to the melt, and press the mixed rare earth into the alloy liquid and stir evenly. When the temperature is 730°C, press The yield of Sr is 0.01% and Al-Sr master alloy is added. When the melt is 710 ℃ ~ 720 ℃, argon is introduced. The time of argon is 10 minutes. The time is 3 minutes, the frequency of ultrasonic vibration is 20-80kHz, after the vibration stops, the aluminum alloy melt is obtained, the obtained aluminum alloy is die-casted, the casting temperature is 680°C, the aluminum alloy is solution treated at 500°C for 4h, and after water quenching , aged at 180°C for 4h.

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Abstract

The invention provides a method for improving the Fe content allowedness of a high-strong and high-toughness aluminum alloy for an automobile structural part. A cast aluminum alloy material which is easily recycled and has high-strength and high-toughness performance is obtained, by means of reasonable component design, by means of the method that adding of Ce+La mixed rare earth elements and adding of ultrasonic vibration are combined, a Fe-rich phase is refined, harm of the Fe phase to the mechanical performance is reduced, it is guaranteed that the aluminum alloy still has high strength andhigh toughness when the Fe content in the aluminum alloy is larger than 0.20% and smaller than or equal to 0.5%, the Fe content allowedness is improved, the high-strength and high-toughness cast aluminum alloy can meet the requirements of the large complex thin-wall structural part for the high-strength and high-toughness die-cast aluminum alloy material while keeping good die-cast formation performance, meanwhile, the aluminum alloy can be recycled, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to a method for increasing the Fe content tolerance of high-strength and tough aluminum alloys used in automobile structural parts. Background technique [0002] Due to the need for lightweight automobiles and the development of new casting technologies, especially the vigorous development of electric vehicles in recent years, it has become an inevitable trend to replace some steel parts, aluminum forgings or multi-component combinations with cast aluminum alloy complex structural parts. Aluminum alloy structural parts are load-bearing parts, which put forward higher requirements for alloy materials. Unlike traditional die-casting alloys with low elongation, aluminum alloy materials for structural parts must have both high strength and high toughness, and take into account good formability. At present, aluminum alloy materials for structural parts are mostly de...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C1/03C22F1/043
CPCC22C21/02C22C1/03C22C1/026C22F1/043
Inventor 钟鼓万里路通汪学阳黄志垣肖博
Owner GUANGDONG HONGTUNANTONGDIE CASTING
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