Supercharge Your Innovation With Domain-Expert AI Agents!

Improved process for manufacturing sheets made of aluminium-copper-lithium alloy for aircraft fuselage manufacture

A manufacturing method, technology for aluminum alloys, applied in the manufacture of fuselage panels, in the field of constraints in the aviation and aerospace industry, capable of solving problems such as degraded performance and not being able to withstand optimized manufacturing methods

Pending Publication Date: 2020-08-04
CONSTELLIUM ISSOIRE
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as detailed in Example 2 below, this product cannot withstand a manufacturing method optimized in terms of aging treatment time without reducing its properties, in particular the compromise between its mechanical strength and toughness

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Improved process for manufacturing sheets made of aluminium-copper-lithium alloy for aircraft fuselage manufacture
  • Improved process for manufacturing sheets made of aluminium-copper-lithium alloy for aircraft fuselage manufacture
  • Improved process for manufacturing sheets made of aluminium-copper-lithium alloy for aircraft fuselage manufacture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Alloy A having the composition shown in Table 1 is an alloy of the present invention.

[0058] Table 1 - Chemical composition (weight %)

[0059] Casting mark Si Fe Cu mn Mg Zr Li Ag Ti A 0.01 0.03 2.3 0.3 0.3 <0.01

1.4 <0.01

0.03

[0060] SOES (Spark Optical Emission Spectroscopy) analysis was performed on the solid.

[0061] Average values ​​were taken for three samples.

[0062] The method used to manufacture plates made of Alloy A was as follows: An ingot made of Alloy A with a thickness of about 400 mm was cast, homogenized at 508° C. for about 12 hours, and then peeled. The ingot was hot rolled to obtain a plate with a thickness of 4 mm. It is solution heat treated at about 500°C and then quenched with cold water. The panels were then stretched with a permanent elongation of 3 to 4%. The following aging treatments were performed on each plate sample: 48h-152°C, 40h-155°C, 30h-160°C and 25h-165°C.

[0063] For e...

Embodiment 2

[0072] Alloy B with the composition shown in Table 4 is a reference alloy known inter alia from document EP 1 966 402 B2.

[0073] Table 4 - Chemical composition (weight %)

[0074] Casting mark Si Fe Cu mn Mg Zr Li Ag Ti B 0.03 0.03 2.4 0.3 0.3 <0.01

1.4 0.34 0.02

[0075] SOES (Spark Optical Emission Spectroscopy) analysis was performed on the solid.

[0076] Take the average of the three samples.

[0077] The method used to manufacture plates made of alloy B was as follows: an ingot made of alloy B with a thickness of about 400 mm was cast, homogenized at 500° C. for about 12 hours, and then peeled. The ingot was hot rolled to obtain a plate with a thickness of 5 mm. It is solution heat treated at about 500°C and then quenched with cold water. The panels are then stretched with a permanent elongation of 1 to 5%. The following aging treatments were performed on each panel sample: 48h-152°C and 25h-165°C.

[0078] According ...

Embodiment 3

[0086] The effect of high temperature aging treatments has also been studied in the literature. This example reproduces the data presented in the articles cited below that disclose the known effects of high temperature aging treatments, such as the high temperature aging treatment of the present invention, on the toughness of aluminum alloys containing, inter alia, copper and lithium:

[0087] _Effects of aging treatment on strength and fracture toughness of 2A97 aluminum-lithium alloy, S.Zhong et al., The Chinese Journal of Nonferrous Metals, Volume 21, n3, 2011

[0088] _The effect of aging temperature on the fracture toughness of an8090 Al-Li alloy, K.J.Duncan and J.W.Martin, Journal of Materials Science Letters, Vol. 10, No. 18, pp. 1098-1100, 1991.

[0089] The article by Zhong et al. deals with Al-Cu-Li alloy 2A97. It reveals a reduction in toughness caused by an increase in temperature in the second aging treatment step of a product made of 2A97 alloy in a two-step agi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The subject of the invention is a process for manufacturing a wrought product made of aluminium alloy comprising the following steps : a) casting a plate made of alloy comprising, in percentages by weight, Cu: 2.1 to 2.8; Li: 1.1 to 1.7; Mg: 0.2 to 0.9; Mn: 0.2 to 0.6; Ti: 0.01-0.2; Ag < 0.1; Zr < 0.08; Fe and Si <= 0.1 each; unavoidable impurities <= 0.05% each and 0.15% in total; remainder aluminium; b) homogenizing said plate at 480-520 DEG C for 5 to 60 hours; c) hot-rolling and optionally cold-rolling said homogenized plate to give a sheet; d) solution annealing the sheet at 470-520 DEG Cfor 5 minutes to 4 hours; e) quenching the solution-annealed sheet; f) controlled tensioning of the solution-annealed and quenched sheet with a permanent set of 1 to 6%; g) tempering of the tensionedsheet by heating at a temperature of at least 160 DEG C for a maximum time of 30 hours.

Description

technical field [0001] The present invention generally relates to a method for the manufacture of metal sheets made of aluminum-based 2XXX alloys containing lithium, and in particular this improved method is particularly adapted to the constraints of the aeronautical and aerospace industry. The method of the invention is particularly suitable for the manufacture of fuselage panels. Background technique [0002] Alloy compositions and fabrication methods are continuously studied in the aerospace and aerospace industries. Al-Cu-Li alloys are of interest for the manufacture of rolled products made of aluminum alloys, especially airframe components, as they generally have higher performance trade-offs than conventional alloys, especially fatigue, damage A compromise between tolerance and mechanical strength. This makes it possible in particular to reduce the thickness of wrought products made of Al-Cu-Li alloys, thereby minimizing the weight they have. Furthermore, in the man...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/12C22C21/16C22F1/057C22C21/14
CPCC22C21/12C22C21/14C22C21/16C22F1/057C21D8/0226C21D8/0236C21D8/0273
Inventor P·洛伦齐诺
Owner CONSTELLIUM ISSOIRE
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com