Preparation method of pure aluminium having uniform fine equiaxed grain structure

A technology of equiaxed crystal and pure aluminum, which is applied in the field of metallographic control of metal heat treatment, can solve the problems of difficult Al-Ti-C alloying, complicated preparation process, difficult process control, etc., and achieves short response time, simple process, Good refinement effect

Inactive Publication Date: 2005-05-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the aluminum melt does not wet the carbon, Al-Ti-C alloying is difficult, and the process is difficult to control, the construction period is long, and the energy consumption is large
[0008] ③Titan

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: After conventional melting of pure aluminum, KBF is added to the mother liquor at a rate of 1.5wt% at a temperature of 750°C 4 and K 2 TiF 6 Compound salt powder refiner; KBF 4 and K 2 TiF 6 The mixing ratio of compound salt is: KBF 4 10wt%, K 2 TiF 6 90wt%; then stir to mix evenly, then go through conventional degassing and slag removal, and then cast after 30 minutes of heat preservation; the metal mold needs to be preheated to 200°C; then cooled to room temperature with the mold to obtain a fine and uniform grain structure Pure aluminum billet. According to the instrument detection, the middle part of the aluminum ingot, the 1 / 4 diameter from the center of the ingot or the edge of the ingot, are all fine and uniform grain structures, and the distribution is consistent everywhere; in addition, the uniform, fine and equiaxed The mechanical properties of the pure aluminum ingot with crystal structure are greatly improved compared with the original p...

Embodiment 2

[0016] Example 2: The preparation process and steps of this example are exactly the same as those of Example 1 above. The difference is: add KBF to the mother liquor 4 and K 2 TiF 6 The amount of compound salt is 0.4wt% of mother liquor weight. Use the same compound salt mixing ratio, ie KBF 4 15wt%, K 2 TiF 6 85wt%; holding time is 30 minutes. Finally, a pure aluminum billet with fine and uniform grain structure can also be obtained. After testing by the instrument, the middle part of the aluminum ingot, the 1 / 4 diameter away from the center of the ingot or the edge of the ingot, are all fine and uniform grain structures, and the distribution is consistent everywhere; in addition, its mechanical properties are better than those of the original pure aluminum casting The ingot has been greatly improved.

Embodiment 3

[0017] Embodiment 3: The preparation process and steps of this embodiment are exactly the same as those of Embodiment 1 above. Add KBF to the mother liquor 4 and K 2 TiF 6 The amount of the compound salt is 1.5wt% of the weight of the mother liquor; the holding time is 30 minutes. The difference is that the mixing ratio of the compound salt is: KBF 4 30wt%, K 2 TiF 6 70wt%. Finally, a pure aluminum billet is obtained. The ingot structure is fine and uniform, but compared with the aluminum ingot in Example 1, its grain size is slightly larger; in addition, the mechanical properties of the aluminum ingot are also slightly worse.

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PUM

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Abstract

A technology for preparing the high-purity aluminium with uniform and fine equiaxed crystal structure includes conventionally smelting high-purity aluminium, adding KBF4 and K2TiF6 powder as fining agent to the molten Al at 700-850 deg.C, stirring, degassing, removing slag, holding the temp for 30-60 min, casting and cooling.

Description

technical field [0001] The invention relates to a preparation method of pure aluminum with uniform fine equiaxed crystal structure, and belongs to the technical field of metallographic control in metal heat treatment processing. Background technique [0002] It is well known that the fine and equiaxed grain structure of metals can improve the mechanical properties and process performance of materials. There are three main ways of grain refinement: [0003] (1) During the solidification process of the liquid ingot, strong agitation is carried out to break the dendritic grid skeleton of the primary solid phase that is easy to form during the solidification process, and to retain the dispersed and uniform granular structure to obtain non-dendritic ingots . US Patent 3902544 proposes a method for preparing non-dendritic ingots by mechanical stirring. Another US patent 3995678 proposes the use of electromagnetic stirring to prepare non-dendritic ingots. [0004] (2) The metho...

Claims

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Application Information

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IPC IPC(8): B22D27/20C22F1/04
Inventor 张恒华唐轩邵光杰许珞萍
Owner SHANGHAI UNIV
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