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Modificator for modifying ferrum-rich phase in hypereutectic high-ferrum-aluminum-silicon alloy, and preparation method thereof

An aluminum-silicon alloy, hypereutectic technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve the problems of inability to completely eliminate acicular β-Fe phase, harsh operating conditions, etc. Tensile strength and elongation, diffusion-friendly effect

Active Publication Date: 2018-11-06
JIANGSU UNIV OF SCI & TECH IND TECH RES INST OF ZHANGJIAGANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defects of harsh operating conditions and inability to completely eliminate the acicular β-Fe phase in existing methods for modifying the iron-rich phase in aluminum-silicon alloys, and to provide a method for hypereutectic high-iron aluminum-silicon alloys A modification agent for modifying the iron-rich phase and its preparation method, and further provides a method for modifying the iron-rich phase in the hypereutectic high-iron-silicon alloy and the use of the hypereutectic high-iron-aluminum-silicon alloy prepared by the method

Method used

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  • Modificator for modifying ferrum-rich phase in hypereutectic high-ferrum-aluminum-silicon alloy, and preparation method thereof
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  • Modificator for modifying ferrum-rich phase in hypereutectic high-ferrum-aluminum-silicon alloy, and preparation method thereof

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Effect test

Embodiment 1

[0036] The preparation method of the modification agent for the modification of the iron-rich phase in the hypereutectic high-iron aluminum-silicon alloy provided in this embodiment includes the following steps:

[0037] (1) Start the high-frequency induction furnace, set the initial frequency at 1.5kw, sandwich the graphite crucible to preheat for 3 minutes, then mix the metal Al, Mn and Ti according to the mass ratio of 73%: 22.8%: 4.2%, and quickly add them to the crucible middle. Then increase the frequency by 1kw every 2min until the heating rate is 5.5kw for smelting, keep warm for 10min, at this time the metal in the crucible is completely melted and a molten metal is formed;

[0038] (2) Refining the molten metal with hexachloroethane powder, then keeping warm, stirring, removing slag, pouring into a copper mold preheated to 250°C, cooling at room temperature, and the casting obtained is the modifier, and the mold is opened Pour out the castings. Wherein, the mass ra...

Embodiment 2

[0047] The preparation method of the modification agent for the modification of the iron-rich phase in the hypereutectic high-iron aluminum-silicon alloy provided in this embodiment includes the following steps:

[0048] (1) Start the high-frequency induction furnace, set the initial frequency at 1.5kw, sandwich the graphite crucible to preheat for 3 minutes, then mix the metal Al, Mn and Ti according to the mass ratio of 72%: 23%: 3.5%, and quickly add them to the crucible middle. Then increase the frequency by 1kw every 2min until the heating rate is 5.5kw for smelting, keep warm for 12min, at this time the metal in the crucible is completely melted and forms a molten metal;

[0049] (2) Refining the molten metal with hexachloroethane powder, then keeping warm, stirring, removing slag, pouring into a copper mold preheated to 300°C, cooling at room temperature, the casting obtained is the modifier, and the mold is opened Pour out the castings. Wherein, the mass ratio of the...

Embodiment 3

[0055] The preparation method of the modification agent for the modification of the iron-rich phase in the hypereutectic high-iron aluminum-silicon alloy provided in this embodiment includes the following steps:

[0056] (1) Start the high-frequency induction furnace, set the initial frequency at 1.5kw, sandwich the graphite crucible to preheat for 3 minutes, then mix the metal Al, Mn and Ti according to the mass ratio of 74%: 22.5%: 5%, and quickly add them to the crucible middle. Then increase the frequency by 1kw every 2min until the heating rate is 5.5kw for smelting, keep warm for 8min, at this time the metal in the crucible is completely melted and forms a molten metal;

[0057] (2) Refining the molten metal with hexachloroethane powder, then keeping warm, stirring, removing slag, pouring into a copper mold preheated to 280°C, cooling at room temperature, the obtained casting is the modifier, and opening the mold Pour out the castings. Wherein, the mass ratio of the he...

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Abstract

The invention provides a modificator for modifying a ferrum-rich phase in a hypereutectic high-ferrum-aluminum-silicon alloy, and belongs to the technical field of modification of the ferrum-rich phase in the alloy. The modificator is prepared from a binary quasicrystal Al78Mn22 and a ternary quasicrystal Al72Mn10Ti18; on one hand, compared with a common Al-Mn alloy, according to the binary Al78Mn22 quasicrystal, the binary quasicrystal at the metastable state is easily dissolved in a melt, and an Mn atom is favorably diffused in the hypereutectic high-ferrum-aluminum-silicon alloy, so that aneedle flaky beta-Fe phase is favorably promoted to convert into an alpha-Fe phase with less adverse effect, the adverse effect on the beta-Fe phase is eliminated, and the tensile strength and the ductility of the hypereutectic high-ferrum-aluminum-silicon alloy are improved; and on the other hand, according to the high-melting-point ternary quasicrystal Al72Mn10Ti18, the size of a primary crystalSi phase in the hypereutectic high-ferrum-aluminum-silicon can be refined.

Description

technical field [0001] The invention belongs to the technical field of modification of iron-rich phases in alloys, and in particular relates to a modification agent for modification of iron-rich phases in hypereutectic high-iron-aluminum-silicon alloys and a preparation method thereof. Background technique [0002] Al-Si alloy has the advantages of low density, low thermal expansion coefficient, good wear resistance, high castability, and strong machinability, so it is widely used in machine manufacturing and other fields, especially in the field of automotive engine pistons. However, the machine made of Al-Si alloy due to eutectic composition has been difficult to meet the high requirements of the continuous development of the current machine (high strength, light weight and other properties). Therefore, the hypereutectic Al-Si alloy with a Si content of 16-26wt% and a better weight reduction effect has attracted more and more attention. However, untreated hypereutectic Al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/06C22C21/04C22C21/00F02F3/00
CPCC22C1/026C22C1/06C22C21/00C22C21/04F02F3/0084
Inventor 张静程朝霞颜寒陈洪美刘宁庞周怡王媛媛王逸飞
Owner JIANGSU UNIV OF SCI & TECH IND TECH RES INST OF ZHANGJIAGANG