Method for compounding hypereutectic aluminium-silicon alloy melt

A melt composite treatment, aluminum-silicon alloy technology, applied in the field of metal materials and metallurgy, can solve the problems of coarse performance and decline of primary silicon

Inactive Publication Date: 2012-11-28
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the coarse primary silicon in the above hypereutectic Al-Si alloy causes performance degradation, the present invention provides a primary silicon with a smaller size and improved Hypereutectic aluminum-silicon alloy melt composite treatment method for tensile strength and hardness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 80% of the alloy material accounting for the mass of the aluminum-18% silicon alloy into an electric furnace and superheat it to 930°C. After holding it for 20 minutes, add the remaining alloy material preheated to about 100°C into the melt and stir it rapidly to make it The temperature of the melt is rapidly cooled to around 770°C. After refining and slag removal, it is returned to the furnace and kept for 8 minutes, and the metal mold is poured at a pouring temperature of about 750°C.

[0023] After heat treatment, the size of primary silicon in the alloy is refined from about 70um to about 18um, the edges and corners are passivated, and the distribution is uniform; the tensile strength increases from 152MPa before heat treatment to 178MPa, and the hardness increases from 45HB to 52HB.

Embodiment 2

[0025] Put 375g of Al-14%Si alloy in an electric furnace and overheat it to 870°C, keep it warm for 30min, add 65g of solid Al-14%Si alloy preheated to about 130°C into the melt, and carry out rapid melting Stir to cool the melt temperature to around 770°C rapidly. After refining, remove slag and return to the furnace to keep it warm for 8 minutes, then pour the metal mold at a pouring temperature of about 750°C.

[0026] After heat treatment, the size of the primary silicon in the alloy is refined from about 65um to about 25um, the edges and corners are passivated, and the distribution is relatively uniform; the tensile strength increases from 156MPa to 163MPa, and the hardness increases from 43HB to 47HB.

Embodiment 3

[0028] Put 80% of the alloy material accounting for the mass of the aluminum-22% silicon alloy into an electric furnace and superheat it to 930°C, keep it warm for 15 minutes, add the remaining alloy material preheated to about 80°C into the melt, and stir rapidly to make The temperature of the melt is rapidly cooled to around 770°C. After refining and slag removal, it is returned to the furnace and kept for 10 minutes, and the metal mold is poured at a pouring temperature of about 750°C.

[0029] After heat treatment, the average size of primary silicon in the alloy is refined from about 100um to about 30um, and the edges and corners are passivated and dispersed; the tensile strength rises from 145MPa to 170MPa, and the hardness rises from 52HB to 60HB.

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Abstract

The invention relates to the field of metal materials and metallurgy, and in particular relates to a method for compounding hypereutectic aluminium-silicon alloy melt. The method comprises the following steps of: mixing 67-90% of the total weight of aluminium and silicon, copper which accounts for 0-2.0% of the alloy total weight and magnesium which accounts for 0-1.5% of the alloy total weight, heating to 870 DEG C-980 DEG C, and thermally insulating for 10 minutes-30minutes, thus obtaining overheating alloy liquid; and adding the residual aluminium and silicon into the overheating alloy liquid at room temperature, quickly cooling to 730 DEG C-780 DEG C, adding mischmetal which accounts for 0.1-0.8% of the total weight of hypereutectic aluminium-silicon alloy and phosphorus which accounts for 0-0.05% of the total weight of hypereutectic aluminium-silicon alloy, refining, standing, then pouring, and thus obtaining the hypereutectic aluminium-silicon alloy melt. After the aluminium-18 silicon-1.5% copper-0.6 magnesium alloy is subjected to mischmetal and phosphorus modification and heat treatment compounding, the alloy tensile strength is improved to 287MPa, and the Brinell hardness is 102HB.

Description

technical field [0001] The invention relates to the field of metal materials and metallurgy, in particular to a composite treatment method for a hypereutectic aluminum-silicon alloy melt. Background technique [0002] Hypereutectic Al-Si alloys have been widely valued and applied in the automotive piston manufacturing industry due to their characteristics of low density, small thermal expansion coefficient, good volume stability, corrosion resistance, wear resistance and high temperature strength. However, there are coarse primary silicon in the structure of hypereutectic Al-Si alloy, which severely splits the matrix, making its performance decrease and cannot meet the needs of practical applications. Therefore, it is necessary to take effective measures to improve the morphology and distribution of primary silicon. In addition, changing the silicon phase morphology in the eutectic phase also contributes to the improvement of mechanical and other properties. [0003] The t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/02
Inventor 耿浩然王庆磊李灿灿张振伟闫兴臣彭熙
Owner UNIV OF JINAN
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