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High-strength heat-resistant casting aluminum-silicon alloy for engine piston

A heat-resistant aluminum and engine technology, used in engine components, machines/engines, pistons, etc., can solve the problems of difficult mass production of materials, and achieve the effect of improving creep resistance, good mechanical properties at room temperature, and meeting the requirements of high temperature performance.

Inactive Publication Date: 2022-01-07
济南科为达新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But TiB 2 The density of the reinforcement phase 4.52g / cm3 is much higher than that of the aluminum melt, and the aluminum alloy melt is larger than 0.2-0.5 micron TiB 2 Reinforced particles will undergo rapid sedimentation and aggregation in a short period of time, making it difficult for this type of material to be mass-produced at the production site
[0007] At present, there is a lack of a casting aluminum-silicon alloy that is suitable for existing equipment and can be produced on a large scale, and whose tensile strength is not lower than 90MPa or higher at a temperature above 350°C

Method used

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  • High-strength heat-resistant casting aluminum-silicon alloy for engine piston
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  • High-strength heat-resistant casting aluminum-silicon alloy for engine piston

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Experimental program
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Effect test

Embodiment 1

[0027] Aluminum silicon alloy composition: Si 15.0%, Cu 4.5%, Mg 1.2%, Mn 0.2%, Ni 3%, Zr 0.3%, Ti0.2%, Hf 0.5%, Sc 0.2%, the balance is Al and unavoidable Impurities.

[0028] microstructure: figure 1 For the microstructure of the aluminum alloy piston material in this embodiment, the particle size and distribution of the primary silicon are uniform, and the particle size is generally between 30-60 μm; the length of the needle-shaped heat-resistant phase is between 60-150 μm.

[0029]Mechanical properties: the tensile strength at room temperature is 320MPa, the elongation after fracture is about 2.0%, and the tensile strength and elongation after fracture at 350°C are 98MPa and 2.9% respectively (see figure 2 )

Embodiment 2

[0031] Aluminum silicon alloy composition: Si 13.5%, Cu 4.0%, Mg 1.2%, Mn 0.2%, Ni 4%, Zr 0.40%, Ti0.30%, Er 0.2%, Nd 0.3%, the balance is Al and unavoidable Impurities.

[0032] microstructure: image 3 It is the microstructure after solution aging of the aluminum alloy piston material of this embodiment. Compared with the as-cast aluminum-silicon alloy, the primary silicon is slightly refined and the corners are spheroidized, the needle-shaped heat-resistant phase does not change significantly, and the eutectic silicon appears as tiny particles due to back-dissolving precipitation.

[0033] Mechanical properties: the tensile strength at room temperature is 295MPa, the elongation after fracture is about 1.5%, and the tensile strength and elongation after fracture at 350°C are 93MPa and 2.1% respectively

Embodiment 3

[0035] Aluminum silicon alloy composition: Si 13.5%, Cu 3.5%, Mg 1.0%, Mn 0.2%, Ni 3.8%, Zr 0.33%, Ti 0.2%, Hf0.4%, Nb 0.3%, the balance is Al and unavoidable Impurities.

[0036] microstructure: Figure 4 It is the scanning electron microscope structure of the aluminum alloy piston material of this embodiment. After high-temperature solution treatment, evenly distributed spherical nanoscale Al 3 Zr-type precipitated particles, the size of which is generally 50nm.

[0037] Mechanical properties: 425°C high temperature tensile strength and elongation after fracture are 59MPa and 27% respectively.

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Abstract

The invention discloses an aluminum-silicon alloy material for an engine piston. The aluminum-silicon alloy material comprises the following elements in percentage by mass, 12.0%-15.0% of Si, 2.0%-4.5% of Cu, 0.5%-1.5% of Mg, 0.2%-0.5% of Mn, 2.2%-4.5% of Ni, 0.1%-0.6% of Zr, Al, incidental elements and impurities. The microalloying incidental elements are one or more of Er, Hf, Nb, Nd, Sc and Ti, and the total adding amount of the microalloying incidental elements meets the condition that (Er + Hf + Nb + Nd + Sc + Ti) wt% is larger than or equal to 0.1% and smaller than or equal to 0.9%. The content of each inevitable impurity element in the aluminum-silicon alloy is less than or equal to 0.05 wt%, and the total content is less than or equal to 0.15 wt%; and the high-temperature performance of the alloy exceeds that of the existing ZL109 alloy, and particularly, the high-temperature strength at 350 DEG C reaches up to 98 MPa.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to the technical field of aluminum-silicon alloy materials for engine pistons. Background technique [0002] At present, high-strength diesel engines are developing toward high power and high load, and aluminum pistons are important reciprocating components of internal combustion engines, and their performance directly affects the performance and reliability of high-strength diesel engines. [0003] As the engine develops towards high power density, the combustion pressure and operating temperature of the piston are getting higher and higher, which puts forward higher requirements on the heat resistance of aluminum-silicon alloys such as high-temperature strength, linear expansion coefficient and volume stability. The widely used ZL109Al-Si alloy material is still poor in high temperature performance at 350°C (not yet required by the existing national standard) and above, and its over...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02F02F3/00
CPCC22C21/02F02F3/0084
Inventor 张海涛魏伟郑强
Owner 济南科为达新材料科技有限公司
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