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High-strength cast aluminum alloy for automobile

A casting aluminum alloy, high-strength technology, applied in the field of aluminum alloy material research, can solve the problems affecting the mechanical properties of casting parts, coarse primary silicon and eutectic silicon phase, and the inability to manufacture shape parts, etc., to eliminate microscopic shrinkage porosity , refine the grain, eliminate the effect of macroscopic shrinkage cavity

Active Publication Date: 2021-03-12
安徽军明机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-silicon aluminum alloys (silicon content greater than 17%) are prone to form coarse primary silicon and eutectic silicon phases during casting due to their high silicon content.
Shrinkage cavities and porosity often appear in molded parts, which seriously affects the mechanical properties of cast parts, making it impossible to manufacture parts with complex shapes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A high-strength cast aluminum alloy for automobiles, containing the following elements in terms of mass percentage: 11% Si, 3.7% Cu, 0.46% Zn, 0.08% Mg, 0.3% Mn, 0.06% V, and 0.06% Zr 0.09%, Ti accounted for 0.06%, RE elements accounted for 0.02%, and the rest was Al and unavoidable impurities; the main preparation techniques include the following steps:

[0018] (1) Place the raw materials for alloy preparation in a resistance furnace for smelting: clean and remove impurities from each raw material, after drying, add Al and Mg first, and after all are dissolved, then add Ti, Cu, Zn, Mn, Zr in sequence, After all melting, finally add V, RE elements and Si, after all the furnace materials are melted, introduce argon gas for refining, the refining time is 11 minutes, stir gently after refining, raise the temperature to 810°C, and remove slag after standing for 5 minutes;

[0019] (2) Pour the refined alloy melt into the preheated mold cavity at a casting temperature of 74...

Embodiment 2

[0027] A high-strength cast aluminum alloy for automobiles, containing the following elements in terms of mass percentage: 12% Si, 3.8% Cu, 0.47% Zn, 0.09% Mg, 0.35% Mn, 0.07% V, and 0.07% Zr 0.10%, Ti accounted for 0.07%, RE elements accounted for 0.025%, and the rest was Al and unavoidable impurities; the main preparation techniques include the following steps:

[0028] (1) Place the raw materials for alloy preparation in a resistance furnace for smelting: clean and remove impurities from each raw material, after drying, add Al and Mg first, and after all are dissolved, then add Ti, Cu, Zn, Mn, Zr in sequence, After all melting, add V, RE elements and Si at the end, after all the charge is melted, introduce argon gas for refining, the refining time is 11-13 minutes, stir gently after refining, raise the temperature to 813°C, stand for 6.5 minutes and then remove slag;

[0029] (2) Pour the refined alloy melt into the preheated mold cavity at a casting temperature of 750°C f...

Embodiment 3

[0037] A high-strength cast aluminum alloy for automobiles, containing the following elements in terms of mass percentage: 13% Si, 4.0% Cu, 0.48% Zn, 0.10% Mg, 0.4% Mn, 0.08% V, and 0.08% Zr 0.12%, Ti accounted for 0.08%, RE elements accounted for 0.03%, and the rest was Al and unavoidable impurities; the main preparation techniques include the following steps:

[0038](1) Place the raw materials for alloy preparation in a resistance furnace for smelting: clean and remove impurities from each raw material, after drying, add Al and Mg first, and after all are dissolved, then add Ti, Cu, Zn, Mn, Zr in sequence, After all melting, finally add V, RE elements and Si, after all the charge is melted, pour argon gas into it for refining, the refining time is 13 minutes, stir gently after refining, raise the temperature to 817°C, let it stand for 8 minutes and then remove the slag;

[0039] (2) Pour the refined alloy melt into the preheated mold cavity at a casting temperature of 755°C...

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Abstract

The invention relates to the technical field of aluminum alloy material research, and discloses a high-strength cast aluminum alloy for an automobile. The content of each element in a silicon-aluminumalloy is adjusted, and the adverse effect of the silicon element on the alloy is eliminated; moreover, the effects of the conditions such as temperature and pressure on the microstructure and mechanical properties of a casting are controlled by utilizing an extrusion casting process; in the casting process, macroscopic shrinkage cavities and microscopic shrinkage porosity are remarkably eliminated, and crystal grains are refined; in the heat treatment process, the mechanical properties of the casting are further enhanced, and the strength of the casting is remarkably improved; and the tensilestrength reaches 375-380 MPa, the elongation reaches 12.7-13.0%, and the hardness reaches 126-128 HB. According to the high-strength cast aluminum alloy for the automobile, the problems that shrinkage cavities and shrinkage porosity occur in the casting process of a high-silicon aluminum alloy, and the crystal grains are coarse in the prior art can be solved, parts with complex properties can bemanufactured, the surface quality of the parts is high, the process is simple and efficient, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of research on aluminum alloy materials, and in particular relates to a high-strength cast aluminum alloy for automobiles. Background technique [0002] Due to the light weight, high strength and good toughness of aluminum alloy, many auto parts at home and abroad are made of aluminum alloy materials. Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, aluminum alloy and chemical industry. Because of their good physical and chemical properties, aluminum and aluminum alloys have been widely used in marine industry, power system and aviation and other fields. [0003] With the development of the automobile manufacturing industry, the proportion of aluminum alloy materials is increasing year by year. In order to improve the wear resistance and heat resistance of the aluminu...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C1/02B22D18/02C22F1/043
CPCC22C21/02C22C1/026B22D18/02C22F1/043C22F1/002
Inventor 王辅成
Owner 安徽军明机械制造有限公司
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