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METHOD OF MANUFACTURING A 7xxx-SERIES ALUMINIUM ALLOY PLATE PRODUCT HAVING IMPROVED FATIGUE FAILURE RESISTANCE

An aluminum alloy plate, anti-fatigue technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problem of increasing the cost of aluminum alloy

Active Publication Date: 2021-01-22
NOVELIS KOBLENZ GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, keeping the impurities Si and Fe at such very low levels increases the cost of the aluminum alloy produced because the source is a very high purity grade material

Method used

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  • METHOD OF MANUFACTURING A 7xxx-SERIES ALUMINIUM ALLOY PLATE PRODUCT HAVING IMPROVED FATIGUE FAILURE RESISTANCE
  • METHOD OF MANUFACTURING A 7xxx-SERIES ALUMINIUM ALLOY PLATE PRODUCT HAVING IMPROVED FATIGUE FAILURE RESISTANCE
  • METHOD OF MANUFACTURING A 7xxx-SERIES ALUMINIUM ALLOY PLATE PRODUCT HAVING IMPROVED FATIGUE FAILURE RESISTANCE

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Embodiment Construction

[0085] The rolled ingots were DC cast of aluminum alloy AA7055 with the composition given in Table 1.

[0086] Table 1

[0087] Si Fe Cu Mg Zn Zr batch A, B, C, D, E 0.07 0.07 2.35 1.94 8.05 0.12

[0088]The thickness of the rolled ingot was about 400 mm. Homogenization of the ingot was carried out as a two-step homogenization process at 465°C (first step) and 475°C (second step), followed by cooling to ambient temperature. After trimming, the ingot was preheated to 410°C for hot rolling. Hot rolling was performed on a hot rolling mill with a work roll radius of about 575 mm. Batches A and B were treated according to the invention, ie both batches were subjected to high pressure reduction passes during the hot rolling process. Batch A received a thickness reduction of about 30% (167mm to 117mm) and Batch B received a thickness reduction of about 28% (165mm to 118mm) during the high pressure rolling pass. The rolling spe...

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Abstract

The invention relates to a method of manufacturing an 7xxx-seriesaluminium alloy plate product having improved fatigue failure resistance, the method comprising the steps of (a) casting an ingot madeof an aluminium alloy of the 7xxx-series comprising (in wt.%): Zn 5 to 9, Mg 1 to 3, Cu 0 to 3,balance aluminium and incidental elements and impurities;(b) homogenizing and / or preheating the cast ingot; (c) hot rolling the ingot into a plate product by rolling the ingot with multiple rolling passes, characterized in that when the intermediate thickness of the plate is between 80 and 220 mm,at least a high reduction hot rolling pass is carried out with a thickness reduction of at least 25%,wherein the plate product has a final thickness of less than 75 mm. The invention is also related to an aluminium alloy plate product and an aerospace structural member produced by this method.

Description

technical field [0001] The invention relates to a method for manufacturing 7xxx series aluminum alloy plate products with improved fatigue failure resistance. The panel products are ideal for aerospace structural applications such as wing skin panels and members and other high strength end users. Background technique [0002] Al-Zn-Mg-(Cu) type alloys or alloys of the AA7xxx series have been used in aircraft construction for more than 50 years and especially for eg wing components the AA7055 series alloys are used especially. These aluminum alloys have the required balance of strength, fracture toughness, and corrosion resistance, and are particularly suitable for aerospace structural applications, such as skin panels on wings. This is disclosed, for example, in US Patent No. 5,221,377. This US patent discloses that in order to obtain these high mechanical characteristics it is necessary to subject the alloy to a three-stage artificial aging process. However, this US pate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22F1/053
CPCC22C21/10C22F1/053B22D7/005C21D8/0226C21D9/46
Inventor S·M·斯潘格尔P·迈耶A·布尔格M·吕布纳S·拉赫尼特
Owner NOVELIS KOBLENZ GMBH