Aluminium alloy low frequency electromagnetic oscillation semicontinuous casting crystal grain fining method and device

A technology of electromagnetic oscillation and grain refinement, applied in the field of material processing, can solve the problems of limited penetration capacity and poor intragranular solidification effect, and achieve the effects of eliminating segregation nodules, reducing internal casting stress and improving yield.

Inactive Publication Date: 2003-06-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the main frequency of the oscillation is twice that of the power frequency magnetic field, its penetrating ability is limited, especially the effect of intragranular solid melting is poor

Method used

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  • Aluminium alloy low frequency electromagnetic oscillation semicontinuous casting crystal grain fining method and device
  • Aluminium alloy low frequency electromagnetic oscillation semicontinuous casting crystal grain fining method and device
  • Aluminium alloy low frequency electromagnetic oscillation semicontinuous casting crystal grain fining method and device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0056] Example 1. Pure aluminum:

[0057] Ingot size: 200

[0058] Casting conditions: casting temperature 680-700°C, casting speed: 100mm / min, cooling water pressure: 0.08Mpa, aluminum alloy dummy rod, no bottom laying.

[0059] to cast

example 27075

[0060] Example 2.7075 alloy low-frequency electromagnetic oscillation semi-continuous casting:

[0061] 7075 aluminum alloy chemical composition Zn Mg Cu Cr Mn Fe Si Al5.1~6.1 2.0~3.0 1.2~2.0 0.16~0.3 ≤0.15 ≤0.5 ≤0.5 balance

[0062] Ingot size: 200

[0063] Casting conditions: casting temperature 680-720°C, casting speed: 80mm / min, cooling water pressure: 0.08Mpa, aluminum alloy dummy rod, no bottom laying.

[0064] Electromagnetic field conditions: AC frequency 30Hz, realized on an external crystallizer, electromagnetic field strength: DC magnetic field: 10000At, AC magnetic field: 20000At

[0065] to cast

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Abstract

The present invention belongs to the field of material processing technology. The equipment includes one crystallizer, one coil over the crystallizer with DC current passing through, one magnet over the DC coil to introduce the DC magnetic field into the melt in the upper part of the crystallizer, one coil outside the crystallizer with low-frequency current passing through. It has low-frequency electromagnetic field frequency of 15-30 Hz, DC magnetic field strength of 0.01-0.06 T, and AC magnetic field strength in the margin inside the crystallizer of 0.01-0.06 T. The semi-continuous low-frequency aluminium alloy casting process has casting temperature 680-750 deg.c, casting speed 50-150 mm/min and cooling water pressure 0.06-0.12 MPa. The present invention has fined cast ingot structure, isometric crystal grains, low cost internal stress, improved surface quality and hgh ingot quality.

Description

Technical field [0001] The invention belongs to the technical field of material processing Background technique [0002] Modern material preparation technology pursues low cost and high performance, that is, high performance price ratio. Melting and casting is no longer just a means of material shaping, but more importantly, it is the first important link in material quality control. Fine grain and homogeneity are the basic directions for improving the performance of modern metal materials. After the material is fine-grained, the strength and plasticity of the material can be greatly increased, and the fracture toughness and fatigue strength of the material can be improved at the same time. Therefore, fine-graining is the basic method to improve the properties of materials. [0003] In order to achieve fine grain, people have adopted a lot of methods, the following methods are more obvious microstructure refinement methods in the solidification process of aluminum alloy. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/114B22D11/115
Inventor 崔建忠张勤秦克
Owner NORTHEASTERN UNIV
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