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Method and equipment for inhibiting crack of high-alloying aluminium alloy square billet

An aluminum alloy and alloying technology, applied in the field of aluminum alloy casting, can solve problems such as ingot crack suppression, and achieve the effect of suppressing cracks

Inactive Publication Date: 2008-02-20
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The basic idea of ​​the above technology is to refine the structure, and does not specifically address the problem of crack suppression in ingots

Method used

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  • Method and equipment for inhibiting crack of high-alloying aluminium alloy square billet
  • Method and equipment for inhibiting crack of high-alloying aluminium alloy square billet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Low-frequency electromagnetic field semi-continuous casting of 7055 aluminum alloy slab:

[0030] Test 7055 aluminum alloy chemical composition (wt%)

[0031] Zn

[0032] Ingot size: 200×600×1600mm corner radius R40mm, unshielded

[0033] Casting conditions: casting temperature: 710-725°C, casting speed: 40mm / min, cooling water flow: large surface: 120 liters / minute, small surface: 60 liters / minute, pure aluminum base.

[0034] Electromagnetic field conditions: frequency 20Hz, electromagnetic field strength: 25000 ampere turns

[0035] Microstructure comparison between low frequency electromagnetic casting and traditional DC casting of 7055 alloy

[0036] casting method

[0037] Dendrite

[0038] Segregation rate of alloying elements: [highest point of alloying elements (facet surface) - lowest point (center)] / average

Embodiment 2

[0040] Semi-continuous casting of 7050 aluminum alloy with low frequency electromagnetic field:

[0041] Test 7050 aluminum alloy chemical composition (wt%)

[0042] Zn

Mg

Cu

Zr

mn

Fe

Si

Al

6.1～6.5

2.0～2.4

2.1～24

0.12～0.14

[0.15

[0.15

[0.10

margin

[0043] Ingot size: 200×600×1600mm corner radius R40mm, unshielded

[0044] Casting conditions: casting temperature: 710-725°C, casting speed: 45mm / min, cooling water flow rate: large surface: 120 liters / minute, small surface: 60 liters / minute, pure aluminum base.

[0045] Electromagnetic field conditions: frequency 25Hz, electromagnetic field strength: 30000 ampere-turns

[0046] Microstructure comparison between 7050 alloy low-frequency electromagnetic casting and traditional DC casting

[0047] casting method

Embodiment 3

[0049] Semi-continuous casting of ultra-high strength aluminum alloy with low frequency electromagnetic field

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Abstract

The invention relates to a method for restraining crack of high-alloyed aluminum alloy and relative device. Said device is the plate blank electromagnetic continuous casting crystallizer, while the electromagnetic coil is inside water tank; the water baffle plate is arranged inside the water tank; and the crystallizer comprises four water supply chambers which are independently arranged in two large surfaces and two small surfaces; the water supply chambers supply water independently while the water amount is controllable; a shield matter is arranged at the angle; the inlet of melt aluminum alloy at the upper part of crystallizer is mounted with a bridge fusion current divider; and the inner side of internal wall of crystallizer is adhered with thermal isolated film. When using said device to 7000 alloy square blanks whose thickness is 150-450mm, the frequency should be 10-50Hz, and the intensity of magnetic field should be 10000-80000 ampere-turns; at the different process of casting, the water supply chambers supply different water amount; the casting speed is 20-50% higher than present technique. The invention can effectively restrain the crack of high-alloyed plate blank.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy casting, in particular to a method and equipment for suppressing cracks in high-alloyed aluminum alloy billets. Background technique [0002] In order to greatly improve the performance of aluminum alloys, the addition of alloying elements in aluminum alloys developed in recent years has continued to increase. For example, the 7075 alloy developed in the United States in the 1950s, with a total content of 10% of alloying elements such as Zn, Mg, and Cu, was developed in the 1970s. The 7050 alloy, the total content of Zn, Mg, Cu and other alloying elements reaches 12%, the 7055 alloy developed in the 1990s, the total content of Zn, Mg, Cu and other alloying elements reaches 14%, and the ultra-high-strength aluminum alloy developed in China recently, The total content of Zn, Mg, Cu and other alloying elements reaches 15%, and the strength of the alloy increases from 500MPa to nearly 800MPa. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/11B22D21/04
Inventor 崔建忠赵志浩左玉波张海涛
Owner NORTHEASTERN UNIV LIAONING