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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1:

[0028] The alloy composition (weight percentage) 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 alloy smelting process are as follows: (1) Preheat the smelting raw materials in an oven to 200°C, keep them warm for more than 2 hours, clean and remove rust on the surface of the slagging tools, bell jars, etc., and coat them with 25% paint. Talc powder and 5% water glass are mixed with appropriate amount of water, and then placed on the surface of the furnace for baking, the baking temperature is 200 ℃, and cleaned after baking for 1 hour to prevent the alloy from increasing iron during the smelting process; (2 ) Preheat the crucible to 400°C, add industrial pure aluminum to the bottom of the crucible, and the pure aluminum will begin to melt at 680-700°C. When the pu...

Example Embodiment

[0030] Example 2:

[0031] The alloy composition (weight percentage) 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 inevitable impurities are less than 0.2%, and the rest is Al. The specific steps of the alloy smelting process are as follows: (1) Preheat the smelting raw materials in an oven to 250°C, keep them warm for more than 2 hours, clean and remove rust on the surface of the slagging tools, bell jars, etc., and coat the coating with 25% Talc powder and 5% water glass are mixed with appropriate amount of water, and then placed on the surface of the furnace for baking at 220 ℃, and cleaned after baking for 1 hour to prevent the alloy from increasing iron during the smelting process; (2) ) Preheat the crucible to 400°C, add industrial pure aluminum to the bottom of the crucible, and the pure aluminum will begin to melt at 680-700°C. When the pure aluminum is h...

Example Embodiment

[0033] Example 3:

[0034] The alloy composition (weight percentage) 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 inevitable impurities are less than 0.2%, and the rest is Al. The specific steps of the alloy smelting process are as follows: (1) Preheat the smelting raw materials in an oven to 220°C, keep them warm for more than 2 hours, clean and remove rust on the surface of the slagging tools, bell jars, etc., and coat them with 25% paint. Talc powder and 5% water glass are mixed with appropriate amount of water, and then placed on the surface of the furnace for baking. The baking temperature is 200°C. After baking for 1 hour, it is cleaned to prevent the alloy from increasing iron during the smelting process; (2) ) Preheat the crucible to 500°C, add industrial pure aluminum to the bottom of the crucible, and the pure aluminum will begin to melt at 680...

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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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