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Heat-resistant cast aluminum alloy and pressure casting method thereof

A technology for casting aluminum alloy and aluminum alloy melt, which is applied in the fields of heat-resistant cast aluminum alloy and its pressure casting preparation, cast aluminum alloy and its preparation field, can solve the problems of difficult grain boundary pinning and other problems, and achieves improved performance and high temperature. Excellent performance and strong operability

Inactive Publication Date: 2015-05-20
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

[0028] 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, 1.3% Fe , other unavoidable impurities are less than 0.2%, and the rest is Al. 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 aluminum...

Embodiment 2

[0031]The alloy composition (percentage by weight) of the heat-resistant cast aluminum alloy described in this embodiment: 9.0% Si, 2.0% Cu, 1.0% Ni, 0.6% Mg, 0.05% Mn, 0.05% Ti, 0.01% Gd, 0.05% Y , 1.2% Fe, other unavoidable impurities are less than 0.2%, and the rest is Al. The specific steps of the melting process of the alloy are as follows: (1) Preheat the melting raw material in an oven to 250°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 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 alu...

Embodiment 3

[0034] 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. 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 when the...

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Abstract

The invention relates to a heat-resistant cast aluminum alloy and a pressure casting method thereof. The aluminum alloy consists of the following elements according to certain weight percentage: Si, Cu, Ni, Mg, Ti, RE, Mn, Fe and the balance of Al. After pressure casting of the heat-resistant cast aluminum alloy provided by the invention, the tensile strength (sigma)b of the alloy at room temperature is greater than or equal to 400MPa, the tensile strength (sigma)b at 300 DEG C is greater than or equal to 210MPa, and the tensile strength (sigma)b at 350 DEG C is greater than or equal to 130MPa; and the elongation delta at room temperature is greater than or equal to 2.0%, the elongation delta at 300 DEG C is greater than or equal to 6.0%, and the elongation delta at 350 DEG C is greater than or equal to 14.0%. By comparing the alloy and pressure casting preparation method thereof provided by the invention with the existing Al-Si cast aluminum alloy and the pressure casting preparation method thereof, the casting performance is improved, the room-temperature and high-temperature mechanical properties of the alloy are remarkably improved, and the application range of the Al-Si cast aluminum alloy is widened.

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 pressure 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): C22C21/02C22C1/03B22D17/00
Inventor 王渠东隋育栋
Owner SHANGHAI JIAO TONG UNIV
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