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Semi-finished product made of aluminium alloy having improved microporosity and manufacturing process

A technology of semi-finished products and aluminum alloys, applied in the field of semi-finished products made of aluminum alloys, which can solve the problems of reduced porosity, inconvenient installation of ultrasonic heads, and reduced hydrogen content

Active Publication Date: 2013-11-13
CONSTELLIUM ISSOIRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method simultaneously leads to the formation of uniform sub-dendritic structures, a reduction in hydrogen content, and a reduction in porosity
It is inconvenient to install the ultrasonic head in the coagulation device

Method used

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  • Semi-finished product made of aluminium alloy having improved microporosity and manufacturing process
  • Semi-finished product made of aluminium alloy having improved microporosity and manufacturing process
  • Semi-finished product made of aluminium alloy having improved microporosity and manufacturing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0082] In this example, 16 kg of aluminum in the form of alloy AA5182 were melted in a crucible. The molten metal was kept at a temperature of 700+5°C during the test. Use Alscan TM The device measures the hydrogen content, which is always used outside of the sonication cycle so as not to interfere with the operation of the probe. The surface of the molten metal was purged permanently with argon at a rate of 5 l / min. No degassing or stirring was performed.

[0083]Sonication was performed at a frequency of 18 kHz with a 500 W ultrasonic transmitter. Samples were collected a few minutes after each treatment. Treatment time is considered cumulatively: the first 2-minute treatment is performed; the second 4-minute treatment is performed, which corresponds to 2+4=6 minutes of treatment time, and so on.

[0084] The microporosity at a rate (representing a rolled slab or extruded billet) was characterized by optical microscopy on a sample taken in the shape of a solidified bloc...

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Abstract

The invention relates to a manufacturing method for making an unwrought semi-finished product having at mid thickness a density of micropores of size greater than 90 μm less than 50% and preferably less than 20% of the density of micropores of size greater than 90 μm obtained by a method according to prior art. The method according to the invention comprises in particular an ultrasound treatment step for the molten metal bath in a furnace and / or a vessel using an immersed device comprising at least one ultrasound transmitter. The semi-finished products obtained according to the method of the invention are particularly advantageous for manufacturing by rolling sheets designed for the aircraft industry to produce spars, ribs, upper and lower wing skins and for manufacturing by extrusion sections designed for the aircraft industry to produce stiffeners.

Description

technical field [0001] The present invention relates to semi-finished products made of aluminum alloys, such as rolled slabs and extruded billets, manufactured by vertical direct chill semi-continuous casting, and more particularly to said semi-finished products, their manufacturing method and use , especially for aerospace engineering. Background technique [0002] Aluminum alloy sheets and thick sections are especially used in the aerospace engineering industry. These products are usually obtained by a process comprising: vertical semi-continuous casting of semi-finished products (rolled slabs and extruded billets), optional homogenization of aluminum alloys, hot working by rolling or extrusion, solidification Solution heat treatment and quenching. The most commonly used alloys are the 2XXX series, 7XXX series alloys and certain lithium-containing 8XXX series alloys. [0003] These products must in particular have certain conventional properties, especially with regard ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22B9/02C22F1/04B22D1/00
CPCC22B9/02C22B21/06C22F1/04C22B9/026C22C21/00B22D1/00Y02P10/20
Inventor P·扎瑞
Owner CONSTELLIUM ISSOIRE
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