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Heat-resistant cast aluminum alloy and extrusion casting method thereof

A technology for casting aluminum alloys and aluminum alloy melts, which is applied in the fields of casting aluminum alloys and their preparation, heat-resistant casting aluminum alloys and their extrusion casting preparations, can solve problems such as difficult-to-grain boundary pinning, and achieves improved performance, The effect of high hardness and increased elongation

Active Publication Date: 2015-04-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the piston is mainly used at high temperature, the Mg that mainly improves the strength of the alloy at room temperature 2 Si, Al 2 Cu and other aging precipitates are coarsened at high temperature, and it is difficult to play an effective pinning effect on the grain boundary

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The alloy composition (percentage by weight) of the heat-resistant cast aluminum alloy described in this embodiment: 11.69% Si, 3.96% Cu, 2.0% Ni, 0.76% Mg, 0.18% Mn, 0.1% Ti, 1.5% Gd, 0.6% Fe , other unavoidable impurities are less than 0.2%, and the rest is Al.

[0032]The specific steps of the melting process of the alloy are as follows: (1) Preheat the melting raw material in an oven to 200°C, keep it warm for more than 2 hours, clean and derust the surface of slag removal tools, bell jars, etc., and apply paint. The paint uses 25% Talcum powder and 5% water glass are mixed with an appropriate amount of water, and then placed on the surface of the furnace for baking at 200°C. After baking for 1 hour, clean up to prevent the alloy from increasing iron during the smelting process; (2 ) Preheat the crucible to 400°C, add commercially pure aluminum to the bottom of the crucible, the pure aluminum starts to melt at 680-700°C, add Al-35Si intermediate alloy when the pure ...

Embodiment 3

[0041] The alloy composition (percentage by weight) of the heat-resistant cast aluminum alloy described in this embodiment: 9.5% Si, 5.5% Cu, 3.5% Ni, 1.5% Mg, 0.25% Mn, 0.2% Ti, 0.05% Gd, 0.1% Y , 0.02% Nd, 1.0% Fe, other unavoidable impurities are less than 0.2%, and the rest is Al.

[0042] The specific steps of the melting process of the alloy are as follows: (1) Preheat the melting raw material in an oven to 220°C, keep it warm for more than 2 hours, clean and derust the surface of the slag removal tools, bell jars, etc., and paint the surface with 25% Talcum powder and 5% water glass are mixed with an appropriate amount of water, and then placed on the surface of the furnace for baking at 200°C. After baking for 1 hour, clean up to prevent the alloy from increasing iron during the smelting process; (2 ) Preheat the crucible to 500°C, add commercially pure aluminum to the bottom of the crucible, the pure aluminum starts to melt at 680-700°C, add Al-35Si intermediate alloy...

Embodiment 4

[0046] The alloy composition (percentage by weight) of the heat-resistant cast aluminum alloy described in this embodiment: 10.5% Si, 4.5% Cu, 2.5% Ni, 0.9% Mg, 0.2% Mn, 0.1% Ti, 0.2% Gd, 0.3% Y , 0.15% Nd, 0.02% Sm, 1.3% Fe, other unavoidable impurities are less than 0.2%, and the rest is Al.

[0047] The specific steps of the melting process of the alloy are as follows: (1) Preheat the melting raw material in an oven to 220°C, keep it warm for more than 2 hours, clean and derust the surface of the slag removal tools, bell jars, etc., and paint the surface with 25% Talcum powder and 5% water glass are mixed with an appropriate amount of water, and then placed on the surface of the furnace for baking at 220°C. After baking for 1 hour, clean up to prevent the alloy from increasing iron during the smelting process; (2 ) Preheat the crucible to 450°C, add commercially pure aluminum to the bottom of the crucible, the pure aluminum will start to melt at 680-700°C, add Al-35Si inter...

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Abstract

The invention relates to a heat-resistant cast aluminum alloy and an extrusion casting method thereof, and belongs to the fields of metallic materials and metallurgy. The alloy consists of the following elements in percentage by weight: Si, Cu, Ni, Mg, Ti, RE, Mn, Fe and Al. The heat-resistant cast aluminum alloy is prepared by virtue of extrusion casting, and after performing solution treatment and artificial aging treatment on the alloy, the room temperature tensile strength sigma b of the alloy is more than or equal to 420MPa, the tensile strength sigma b at 300 DEG C is more than or equal to 220MPa, the tensile strength sigma b at 350 DEG C is more than or equal to 140MPa, the room temperature extensibility delta is more than or equal to 2.5%, the extensibility delta at 300 DEG C is more than or equal to 6.5%, and the extensibility delta at 350 DEG C is more than or equal to 14.5%. According to the alloy and the extrusion casting method thereof provided by the invention, the casting performance is improved, the room-temperature and high-temperature mechanical properties of the alloy are greatly improved, and the application range of Al-Si series cast aluminum alloys is expanded.

Description

technical field [0001] The invention relates to a cast aluminum alloy and a preparation method thereof, in particular to a heat-resistant cast aluminum alloy and a squeeze casting preparation method thereof, belonging to the field of metal materials and metallurgy. Background technique [0002] With the shortage of global oil resources, various countries have introduced increasingly stringent vehicle exhaust emission standards, and the production of new vehicles with light weight, low fuel consumption and environmental protection is an increasingly serious topic in the automotive industry. In order to reduce energy consumption, reduce air pollution, and improve engine efficiency, increasing combustion temperature has become an important development trend of engines, and correspondingly higher requirements are put forward for the high-temperature strength of engine accessories. The piston is called the heart of the engine. It is one of the most important parts in the engine. ...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C1/03C22C1/06C22F1/043B22D18/02
CPCB22D18/02C22C1/03C22C1/06C22C21/02C22F1/043
Inventor 隋育栋王渠东
Owner SHANGHAI JIAO TONG UNIV
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