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Preparation process of an al-si-mg-b-mn casting alloy with excellent flow properties

An al-si-mg-b-mn, flow performance technology, applied in the field of aluminum alloy materials, can solve the problem that the fluidity requirements of aluminum alloy thin-wall casting cannot be met, the refinement limit refinement effect is unstable, and the improvement effect is not good. Obvious and other problems, to achieve the effect of reducing loose pores, enhancing feeding ability, and reducing the possibility of cracks

Active Publication Date: 2022-03-15
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of rare earth elements such as La and Ce in aluminum-silicon alloys can significantly improve fluidity, but the production cost is high and the improvement effect is not obvious
Al-Ti-B master alloy is also widely used as a grain refiner in the current aluminum alloy melt treatment to improve the fluidity of the alloy, but it has a certain refinement limit and its refinement effect is not good when applied to production. Stablize
At present, these methods still cannot meet the fluidity requirements of aluminum alloy thin-wall casting.

Method used

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  • Preparation process of an al-si-mg-b-mn casting alloy with excellent flow properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment prepares hypoeutectic Al-Si-Mg-B-Mn casting alloy according to the following steps:

[0040] 1. Calculation of ingredients: according to the mass percentage of 91.43% Al, 6.5% Si, 0.45% Mg, 0.02% B, 1.50% Mn and 0.10% Ti, weigh pure aluminum, Al-Si master alloy, Al-Mg master alloy, Al-B master alloy, Al-Mn master alloy and Al-Ti master alloy complete the batching;

[0041] 2. Coating and drying: In order to prevent the aluminum alloy melt from reacting with the tool during the casting process, the coating (mainly composed of ZnO and NaSiO 3 , the composition ratio is 3:1) evenly coated on the graphite clay crucible, melting tools and molds, and put the graphite clay crucible in the melting furnace to dry. Drying and preheating in a drying oven at -300°C;

[0042] 3. Smelting and casting: Add the weighed Al-Si master alloy and pure aluminum into the graphite crucible which has been preheated to 300°C in sequence, and then raise the temperature to 730°C ...

Embodiment 2

[0048] The ingredients of this embodiment are shown in Table 1.

[0049] The preparation method of this embodiment is the same as that of Example 1.

Embodiment 3

[0051] The ingredients of this embodiment are shown in Table 1.

[0052] The preparation method of this embodiment is the same as that of Example 1.

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Abstract

The invention discloses a preparation process of an Al-Si-Mg-B-Mn casting alloy with excellent fluidity, wherein the composition of the Al-Si-Mg-B-Mn casting alloy is composed of: Si 6.50-7.50 %, Mg 0.25-0.45%, B0.02-0.03%, Mn 1.50-2.00%, Fe≤0.12%, Ti 0.10-0.20%, and the balance is aluminum. The present invention improves the microstructure and properties of the Al-Si alloy through batching, smelting and casting, heat treatment and other technological processes, which can ensure high strength and hardness while improving the fluidity of the alloy and reducing costs, which is beneficial It is widely used in the manufacturing industry of auto parts.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy materials, and in particular relates to a preparation process of an Al-Si-Mg-B-Mn casting alloy with excellent fluidity. Background technique [0002] Al-Si-Mg alloys are widely used in automobiles, aerospace, ships and other fields because of their good toughness, medium strength, superior corrosion resistance and good processability. Today, with the rapid development of the automobile industry, the requirements for energy saving and consumption reduction are constantly rising, safety and environmental protection regulations are becoming increasingly strict, and the demand for lightweight automobiles is even more urgent. Aluminum alloy thin-wall casting is of great significance to the light weight and energy saving of transportation. If the fluidity of the molten metal is poor, the molten metal in the thin-walled casting mold will solidify prematurely, resulting in incomplete filling and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/04C22C1/03C22F1/043C21D1/18B22D7/06
CPCC22C21/04C22C1/026C22C1/03C22F1/043C22F1/002B22D7/068
Inventor 杜晓东李志施豪杰吴玉程
Owner HEFEI UNIV OF TECH
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