High-strength cast aluminum-silicon alloy for engine body and preparation method thereof

A technology of casting aluminum-silicon alloy and engine body, which is applied to high-strength casting aluminum-silicon alloy and its preparation. The alloy is in the field of smelting and heat treatment process corresponding to its composition range, which can solve the obstacles to popularization and application, and the increase of production cost to reduce the content of precious elements, refine grains, and strengthen the matrix

Inactive Publication Date: 2010-07-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this improves the performance of the alloy to a certain extent, it also leads to a substantial increase in production costs
This situation has hindered the popularization and application of this kind of alloy under normal industrial production conditions.

Method used

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  • High-strength cast aluminum-silicon alloy for engine body and preparation method thereof
  • High-strength cast aluminum-silicon alloy for engine body and preparation method thereof
  • High-strength cast aluminum-silicon alloy for engine body and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1: smelting alloy is composed as follows:

[0057] Si: 12.5wt%; Ni: 0.25wt%; Cu: 5.0wt%; Fe: 0.3wt%; Mn: 0.5wt%; Mg: 0.3wt%; Ti: 0.15wt%; Al.

example

[0058] Example alloy number: CF3.

[0059] The alloy preparation steps are as follows: Spread a layer of flux on the bottom of the crucible, then put industrial pure aluminum (purity > 99.0wt%) and intermediate alloys into the crucible in layers, place the ones with low melting point and low density in the lower layer, and put the ones with high melting point and high density Place it on the upper layer; raise the furnace temperature to 780°C, keep warm until the raw materials are in paste form, press the Al-Ti, Al-Zr intermediate alloy into the bottom of the crucible with a bell jar, and then spread flux on the surface of the melt; wait for the raw materials to melt completely Finally, insert a clean Ti rod into the melt and stir gently for 3-5 circles to remove the slag on the surface of the melt; use a bell jar to press AlP into the melt twice for deterioration treatment, and take out the bell jar after it is completely melted. Raise the temperature to 800°C and keep it war...

Embodiment 2

[0064] Embodiment 2: The smelted alloy is composed of the following components:

[0065] Si: 13.5wt%; Ni: 0.3wt%; Cu: 5.0wt%; Fe: 0.8wt%; Mn: 0.6wt%; Mg: 0.4wt%; Ti: 0.10wt%; Zr: 0.27wt%. Al.

[0066] Example alloy number: CF8.

[0067] The alloy preparation steps are as follows: Spread a layer of flux on the bottom of the crucible, then put industrial pure aluminum (purity > 99.0wt%) and intermediate alloys into the crucible in layers, place the ones with low melting point and low density in the lower layer, and put the ones with high melting point and high density Place it on the upper layer; raise the furnace temperature to 780°C, keep warm until the raw materials are in paste form, press the Al-Ti, Al-Zr intermediate alloy into the bottom of the crucible with a bell jar, and then spread flux on the surface of the melt; wait for the raw materials to melt completely Finally, insert a clean Ti rod into the melt and stir gently for 3-5 circles to remove the slag on the surfa...

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Abstract

The invention relates to a high-strength cast aluminum-silicon alloy for an engine body and a preparation method thereof, belonging to the field of metal materials. The alloy comprises the following components in percentage by weight: 12.0-14.0% of Si, less than 0.3% of Ni, 3.0-5.0% of Cu, 0.3-0.8% of Fe, 0.4-0.8% of Mn, less than 0.4% of Mg, 0.1-0.2% of Ti, less than 0.27wt% of Zr and balance of Al. Heat treatment parameters are as follows: the solution treatment is carried out at 510+/-5 DEG C for 5-8h and then water quenching is carried out at room temperature; and the aging treatment is carried out at 160+/-5 DEG C for 6-10h and then air cooling is carried out. The tensile strength and the yield strength of the alloy at room temperature after heat treatment respectively reach 316-336MPa and 245-263MPa, the elongation of the broken alloy reaches 0.72-0.83%, and the Brinell hardness reaches 155-166HBW to the maximum. Compared with the similar alloys, the alloy of the invention has the advantages of high mechanical properties, low content of Ni elements, reduction of content of noble elements in the alloy, wider allowed fluctuation range of content of Fe elements, good cast ingot quality, simple processes and strong operability.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a high-strength cast aluminum-silicon alloy for an engine body and a preparation method thereof, in particular to a melting and heat treatment process corresponding to the alloy within its composition range. Background technique [0002] When the engine is working, the body continues to bear complex mechanical loads such as tension, compression, bending, and twisting; the cylinder wall is in direct contact with the high-temperature gas in the combustion chamber, and it bears high thermal loads for a long time. In order to meet the material requirements of the harsh working environment, the alloy used in the preparation of the body should have sufficient strength and rigidity, and have good wear resistance and corrosion resistance. [0003] Under the industry background of reducing vehicle weight, increasing speed and saving energy, the application of cast aluminum alloy body on engin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/03C22F1/043
Inventor 惠希东王恩睿王树申王云亮刘胜男
Owner UNIV OF SCI & TECH BEIJING
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