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Method for regulating and controlling overall performance of hypereutectic aluminum-silicon alloy casting

An aluminum-silicon alloy and hypereutectic technology, which is applied in the field of particle-reinforced aluminum-matrix composite material forming, can solve the problems of low strength and toughness, uneven distribution of microstructure, and achieve improved yield strength, improved performance and service life, increased The effect of viscosity

Inactive Publication Date: 2019-09-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of non-uniform performance and low strength and toughness existing in the prior art, the present invention provides a method for regulating the overall performance uniformity and strength and toughness of hypereutectic aluminum-silicon alloy castings. The combination of technologies can effectively solve the problems of uneven microstructure distribution and low strength and toughness in hypereutectic aluminum-silicon alloys, and improve the service performance and service life of castings

Method used

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  • Method for regulating and controlling overall performance of hypereutectic aluminum-silicon alloy casting
  • Method for regulating and controlling overall performance of hypereutectic aluminum-silicon alloy casting
  • Method for regulating and controlling overall performance of hypereutectic aluminum-silicon alloy casting

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Embodiment 1

[0024] Embodiment 1: ZrB prepared in this embodiment 2 Reinforced hypereutectic Al-Si alloy composite with 1% in situ self-generated ZrB 2 Particles (500nm~3μm), the matrix is ​​Al~20%Si, the liquidus temperature is 706°C, the specific steps are as follows;

[0025] 1. According to the molar ratio of 1:2, K with a purity of 99.9% 2 ZrF 6 And purity 99.9% for KBF 4 Mix well, and then dehydrate at 200°C;

[0026] 2. According to the mass ratio of 4:1, put industrially pure Al with a purity of 99.7% and metallurgical silicon with a purity of 98% in a resistance furnace to melt, and when the melt temperature reaches and remains at 850°C, put the fluorine The salt is sent into the molten pool by blowing powder from the bottom of the molten pool with an inert gas, the amount of fluorine salt added is 2% of the mass of the melt, and the particle-reinforced hypereutectic aluminum-silicon alloy composite material is prepared under vigorous mechanical stirring at 500r / min for 50min;...

Embodiment 2

[0030] Embodiment 2: the TiB that this embodiment makes 2 The composition of the reinforced hypereutectic aluminum-silicon alloy composite material is 6% in-situ self-generated TiB2 particles (80nm~1μm), the matrix is ​​Al-17%Si-4Cu-0.4Mg alloy (A390 alloy), and the liquidus temperature is 700°C;

[0031] 1. According to the molar ratio of 1:2, K with a purity of 99.9% 2 TiF 6 And purity 99.9% for KBF 4 Mix well, and then dehydrate at 200°C;

[0032] 2. Melt the A390 alloy in a resistance furnace. When the melt temperature reaches and maintains at 850°C, the fluorine salt in step 1 is sent into the molten pool by blowing powder from the bottom of the molten pool through an inert gas. The amount of fluorine salt added It is 11% of the mass of the melt, and the particle reinforced hypereutectic aluminum-silicon alloy composite material is prepared under vigorous mechanical stirring at 500r / min for 50min;

[0033] 3. Add C to the composite material 2 Cl 6 Carry out slag and...

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Abstract

The invention discloses a method for regulating and controlling the overall performance of a hypereutectic aluminum-silicon alloy casting. According to the method, in the preparation process of an eutectic aluminum-silicon alloy casting, submicron second-phase particles are introduced into a melt to prepare a particle-reinforced hypereutectic aluminum-silicon alloy composite material, when the temperature of the particle-reinforced hypereutectic aluminum-silicon alloy composite material subjected to slag removal and degassing is cooled to 20-30 DEG C above the liquidus temperature, the melt is subjected to over-flow cooling treatment, and the casting with uniform and strengthened micro structures is obtained through semi-solid forming. According to the method, the second-phase reinforcement and the over-flow cooling treatment are combined together, so that the synergistic optimization of the uniformity of the overall performance and the strength and toughness of the particle-reinforced hypereutectic aluminum-silicon alloy composite material casting is realized; and the method is convenient to operate, low in cost, and has high engineering application value.

Description

technical field [0001] The invention relates to a method for regulating the overall performance uniformity and toughness of a hypereutectic aluminum-silicon alloy casting, and belongs to the field of forming particle-reinforced aluminum-based composite materials. Background technique [0002] Hypereutectic aluminum-silicon alloy (12~25% Si) has the advantages of low thermal expansion coefficient (close to cast iron), high thermal fatigue performance, high temperature wear resistance and corrosion resistance, etc. Due to the requirements of high dimensional stability and high-speed friction conditions, such materials have been used in pistons, cylinder liners and cylinder blocks in engines at home and abroad. [0003] However, the nucleation and growth of the primary silicon phase are highly sensitive to the nucleation substrate and cooling rate, and the complex temperature field, concentration field, and flow field in the solidification and filling process of the alloy melt ...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C1/10C22C32/00C22F3/00
CPCC22C21/02C22C1/1036C22C32/00C22F3/00C22C32/0073C22C1/1052
Inventor 李璐肖赢席帅营耿保玉李永坤王秋平周荣锋
Owner KUNMING UNIV OF SCI & TECH
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