A casting aluminum alloy for high power density piston and its preparation method

A technology of casting aluminum alloy and high power density, which is applied in the field of casting aluminum alloy, can solve the problems of decreased alloy strength and poor comprehensive mechanical properties, and achieve the goals of improving heat resistance, good comprehensive mechanical properties, and improving structure and performance stability Effect

Active Publication Date: 2021-12-17
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

By uniformly distributing Fe and Ni-rich intermetallic compounds in the alloy in the form of nanoparticles, the heat resistance is improved, and it has better tensile properties and strength at room temperature, and a higher temperature at 200°C. Strength, however, when the temperature exceeds 250°C, the strength of the alloy will drop sharply, and the comprehensive mechanical properties will be poor

Method used

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  • A casting aluminum alloy for high power density piston and its preparation method
  • A casting aluminum alloy for high power density piston and its preparation method
  • A casting aluminum alloy for high power density piston and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The total mass of the aluminum alloy of this embodiment is 50kg, and the cast aluminum alloy used for high power density pistons includes the following components: Si: 11.5%, Cu: 3.5%, Mg: 0.9%, Ni: 2.5% by mass percentage %, Fe: 0.6%, Mn: 0.25%, Sc: 0.13%, Zr: 0.15%, Ti: 0.15%, V: 0.1%, and the balance is Al and unavoidable impurities. The mass ratio of Fe / Mn in the prepared aluminum alloy is 2.4:1, and the mass percentage of the high-temperature support strengthening phase is 6.2%.

[0040] The preparation method of the above-mentioned cast aluminum alloy comprises the following steps in sequence:

[0041] S1: Prepare ingredients: use pure aluminum ingots, pure magnesium ingots, AlSi30, AlCu50, AlNi20, AlFe20, AlMn10 and AlSc2, according to the mass percentage of each component of the aluminum alloy, and preheat the ingredients at 160 ° C and keep them warm for 30 ~60min; according to the alloy composition and stoichiometric ratio, calculate the amount of required ra...

Embodiment 2

[0051]The total mass of the aluminum alloy of this embodiment is 50kg, and the cast aluminum alloy used for high power density pistons includes the following components in terms of mass percentage: Si: 11.8%, Cu: 3.8%, Mg: 0.9%, Ni: 2.8 %, Fe: 0.6%, Mn: 0.28%, Sc: 0.13%, Zr: 0.15%, Ti: 0.15%, V: 0.1%, and the balance is Al and unavoidable impurities. The mass ratio of Fe / Mn in the prepared aluminum alloy is 2.14:1, and the mass percentage of the high-temperature support strengthening phase is 7.2%.

[0052] The preparation method of the above-mentioned cast aluminum alloy comprises the following steps in sequence:

[0053] S1: Prepare ingredients: use pure aluminum ingots, pure magnesium ingots, AlSi30, AlCu50, AlNi20, AlFe20, AlMn10 and AlSc2, according to the mass percentage of each component of the aluminum alloy, and preheat the ingredients at 160 ° C and keep them warm for 30 ~60min; according to the alloy composition and stoichiometric ratio, calculate the amount of req...

Embodiment 3

[0063] The total mass of the aluminum alloy in this embodiment is 50kg, and the cast aluminum alloy used for high power density pistons includes the following components: Si: 12%, Cu: 4.0%, Mg: 0.9%, Ni: 3.0 %, Fe: 0.6%, Mn: 0.28%, Sc: 0.13%, Zr: 0.15%, Ti: 0.15%, V: 0.1%, and the balance is Al and unavoidable impurities. The mass ratio of Fe / Mn in the prepared aluminum alloy is 2.14:1, and the mass percentage of the high-temperature support strengthening phase is 7.6%.

[0064] The preparation method of the above-mentioned cast aluminum alloy comprises the following steps in sequence:

[0065] S1: Prepare ingredients: use pure aluminum ingots, pure magnesium ingots, AlSi30, AlCu50, AlNi20, AlFe20, AlMn10 and AlSc2, according to the mass percentage of each component of the aluminum alloy, and preheat the ingredients at 160 ° C and keep them warm for 30 ~60min; according to the alloy composition and stoichiometric ratio, calculate the amount of required raw materials, and the ...

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Abstract

The present invention relates to a cast aluminum alloy used for high power density pistons and a preparation method thereof, wherein, a cast aluminum alloy is characterized in that: in terms of mass percentage, the cast aluminum alloy comprises the following components: Si: 11.0 ~12.6%, Cu: 3.5~4.5%, Mg: 0.7~1.2%, Ni: 2.2~3.2%, Fe: 0.6~0.8%, Mn: 0.25~0.35%, Sc: 0.10~0.15%, Zr: 0.13~ 0.17%, Ti: 0.13-0.17%, V: 0.08-0.12%, and the balance is Al and unavoidable impurities. Heat-resistant aluminum alloy is based on the thermodynamic analysis of the material system, microstructure control and experimental testing, by appropriately increasing and adjusting the relative addition of elements such as Fe, Ni, Cu, etc., to increase the 350‑420 °C high temperature support strengthening phase Al 9 FeNi, Al 15 Si 2 (Fe,Mn) 3 、Al 3 CuNi, Al 7 Cu 4 The content of Ni makes the solidification structure present scattered network, petal and diffuse stripe distribution. These high-temperature strengthening phases can hinder the grain boundary slip and dislocation movement in the alloy, and improve the heat resistance and grain boundary. Strength and creep resistance.

Description

technical field [0001] The invention belongs to the technical field of casting aluminum alloys, and in particular relates to a casting aluminum alloy for high power density diesel engine pistons and a preparation method thereof. Background technique [0002] At present, as a power machine with high thermal efficiency and wide application, diesel engine will be in an irreplaceable dominant position for a long time. [0003] As a high-frequency moving part, the piston of a high-power-density diesel engine has a maximum temperature of 420°C at its throat, a calibrated speed increased from 2100r / min to 4200r / min, and a maximum combustion pressure increased from 14MPa to 22MPa. Excellent high-temperature mechanical performance and reliability will directly affect the technical indicators and service life of the whole machine. Therefore, the development of heat-resistant cast aluminum alloys and their preparation methods for service at higher temperatures of 350°C-420°C is a mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/04C22C1/03C22C1/06
CPCC22C21/04C22C1/03C22C1/026C22C1/06
Inventor 汤进军梁翠陈大辉高德张学昌王炳涛张炜许晨光
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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