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Process method for refining aluminum alloy solidified structure by in situ generation of TiC particles

A technology of solidification structure and process method, which is applied in the preparation of high-performance aluminum alloy castings and refines the solidification structure of aluminum alloys. It can solve the problems of high temperature use restrictions, negative electrode potential, and low melting temperature, and achieve easy and simple operation. , The effect of simple production process

Inactive Publication Date: 2017-03-29
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, the current application of aluminum alloys is far less than that of steel materials. The main reason is that the current aluminum alloys: low hardness, poor wear resistance; low melting temperature, limited use at high temperatures; Contact is easy to form galvanic corrosion

Method used

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  • Process method for refining aluminum alloy solidified structure by in situ generation of TiC particles
  • Process method for refining aluminum alloy solidified structure by in situ generation of TiC particles
  • Process method for refining aluminum alloy solidified structure by in situ generation of TiC particles

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Embodiment 1

[0038] Embodiment 1: 7075 alloy, tetrafluoroethane (CH 2 f 4 ) and CO 2 Mixed gas protection, melting temperature 1100°C-1150°C, heat preservation 10min, add carbon powder and titanium powder and stir evenly, then add C 2 Cl 6Refining, mechanical stirring for 30mim, stop heating until the melt temperature is cooled to 720°C with the furnace, pouring, metal casting mold preheating 300°C, the achieved indicators: tensile strength 278Mpa, yield strength 112Mpa, elongation 7.4%.

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Abstract

The invention provides a process method for refining aluminum alloy solidified structure, and belongs to the field of solidification technology. The invention aims at the problem of coarse microstructure of aluminium alloy castings, an aluminium alloy casting is prepared by using an in situ reaction generated TiC particle permanent mold casting method, aluminium alloy solidified structure is refined, and the purpose for improving performance of castings is realized. The concrete method is as follows: (1) aluminium alloy which is prepared from specific components is placed in a crucible electric resistance furnace, the electric resistance furnace is heated to 1100-1150 DEG C, and alloy is totally melted to a certain degree of superheat; (2) after each component of molten metal is uniformized, powdered carbon is firstly added into the molten melt with uniform stirring, titanium powder is added, and the power is reacted in the molten metal and TiC particles are generated; (3) after the reaction is sufficiently carried out and diffusion is uniform, heating is stopped, and the molten metal is cooled in furnace to a casting temperature 710-730 DEG C, and refining is carried out; (4) the molten aluminium alloy metal is poured into a metal casting mold, and after natural cooling, the casting is taken out. The aluminium alloy casting has refined solidified structure and improved casting performance, and application fields of aluminium alloy castings are extended.

Description

technical field [0001] The invention belongs to the technical field of solidification and relates to a process method for refining the solidification structure of aluminum alloys, which is suitable for the preparation of high-performance aluminum alloy castings required by industrial fields such as automobiles, communication electronics and aerospace. Background technique [0002] With the wide application and rapid development of aluminum and aluminum alloy materials, especially in the fields of automobiles, electronics, and aerospace, the automotive industry has successfully applied aluminum for automobiles such as seat frames, gearboxes, wheels, and engine blocks. Alloy die castings, which put forward strict requirements on the cast aluminum alloy and its deep-processed structure. Microstructure refinement can not only improve the strength of the material, but also improve the plasticity of the material. The microstructure refinement technology can significantly improve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/10
Inventor 何业增隋艳伟罗海波戚继球委福祥孟庆坤陈章波王瑞
Owner CHINA UNIV OF MINING & TECH
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