Method for improving stress corrosion resisting performance of aluminum lithium alloy

A corrosion performance, aluminum-lithium alloy technology, applied in the field of heat treatment process that can improve the stress corrosion resistance of aluminum-lithium alloys, can solve the problems of reducing the stress corrosion resistance of the alloy, cracking, and affecting the application range of the alloy, so as to improve the stress corrosion resistance The performance, the process is simple and feasible, and the effect of industrialization is strong

Active Publication Date: 2017-04-26
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
View PDF0 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the subsequent aging process, the precipitated phases are first precipitated at the grain boundaries to form continuous plates or granular precipitation belts. These grain boundary precipitates are first dissolved as anodic phases during the c

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
  • Method for improving stress corrosion resisting performance of aluminum lithium alloy
  • Method for improving stress corrosion resisting performance of aluminum lithium alloy
  • Method for improving stress corrosion resisting performance of aluminum lithium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Using the method for improving the stress corrosion resistance of aluminum-lithium alloy deformed products involved in the present invention, the alloy composition and weight percentage are: Cu 3.85%, Li 1.52%, Mg 0.43%, Zn 0.50%, Mn 0.42%, Zr 0.11% , Sc 0.08%, Ti 0.06%, Si 0.06%, Fe 0.08%, the balance is Al, and the hot-rolled plate with a thickness of 80mm is annealed. The annealing temperature is 465°C, the holding time is 4h, and the cold Rapidly cool to 240°C with the furnace, and air-cool after taking out the furnace. After cooling to room temperature, the cold rolling treatment with a total deformation of 25% is carried out on the rolling mill, and the final thickness is 60 mm. Then, the plate is subjected to solution treatment at 520 ° C, the holding time is 270 min, and water is sprayed and quenched at room temperature. After quenching, the plate is pre-stretched at 4.0%, and artificially aged at 150°C for 28 hours to measure the tensile, fracture properties an...

Embodiment 2

[0020] Using the method for improving the stress corrosion resistance of aluminum-lithium alloy deformed products involved in the present invention, the alloy components and weight percentages are: Mg 4.25%, Li 2.20%, Mn 0.21%, Zr 0.11%, Sc 0.08%, Ti 0.06% , Si0.07%, Fe 0.08%, the balance is Al, a 1m long section is taken from a free forging with a thickness of 50mm for annealing treatment, the annealing temperature is 380°C, the holding time is 3h, and the cooling rate is 25°C / h. Cool with the furnace To 260 ℃, out of the oven and air-cooled. After cooling to room temperature, the cold pressing treatment with a total deformation of 18% is carried out in the forging press, and then the free forging is subjected to solution treatment at 500°C, the holding time is 160min, and water quenching at room temperature. After quenching, the forgings were subjected to 1.5% cold compression, and then artificially aged at 120°C for 30 hours to measure the tensile, fracture properties and s...

Embodiment 3

[0026] The method for improving the stress corrosion resistance of aluminum-lithium alloy deformed products involved in the present invention has the following alloy components and weight percentages: Cu 3.60%, Li 1.10%, Mg 0.40%, Zn 0.20%, Mn 0.35%, Zr 0.11%, Ag0.45%, Ti 0.06%, Si 0.06%, Fe 0.08%, the balance is Al, and the hot-rolled plate with a thickness of 120mm is annealed. The annealing temperature is 480°C, the holding time is 6h, and the cooling rate is 40°C / h. Cool down to 220°C with the furnace, and air-cool after taking out the furnace. After cooling to room temperature, the cold rolling treatment with a total deformation of 20% is carried out on the rolling mill, and then the plate is subjected to solution treatment at 530°C, the holding time is 430min, and room temperature water spray quenching. After quenching, the plate is pre-stretched by 4.3%, and artificially aged at 150°C for 20h, and the tensile, fracture properties and stress corrosion properties (C ring)...

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 invention belongs to the aluminum lithium alloy heat treatment technology, in particular to a heat treatment technology capable of improving the stress corrosion resisting performance of an aluminum lithium alloy. Applicable alloy components of the technology comprise main alloying elements including, by weight percent, 0.5%-5.0% of Cu, 0.4%-2.5% of Li, 0.1%-4.0 % of Mg and 0.1%-4.0% of Zn, comprise microalloying elements including any one to four of, by weight percent, 0.04%-0.02% of Zr, 0.05%-0.60% of Sc, 0.20%-0.80% of Mn and 0.1%-0.9% of Ag and comprise, by weight percent, smaller than or equal to 0.10% of Si, smaller than or equal to 0.10% of Fe, smaller than or equal to 0.10% of Ti, smaller than or equal to 0.05% of each of other impurities and the balance Al, wherein the total amount of other impurities is smaller than or equal to 0.15%. After a deformed product is subjected to annealing treatment, cold deformation of a certain deformation amount is conducted, then solution hardening is conducted, regulation and control over the recrystallization degree and the grain boundary precipitates can be achieved through the manner, and other mechanical properties of the alloy are kept unchangeable while the stress corrosion resisting performance of the alloy is improved. The alloy preparing steps include annealing treatment, cold deformation treatment, solution treatment and ageing treatment. The technology is suitable for high-performance Al-Cu-Li-X series aluminum lithium alloy thick plates and forge pieces used in the fields of aviation, spaceflight and weapons.

Description

technical field [0001] The invention belongs to aluminum-lithium alloy heat treatment technology, in particular to a heat treatment process capable of improving the stress corrosion resistance performance of aluminum-lithium alloy. Background technique [0002] Al-Li alloys have attracted attention in the aerospace field due to their low density, high specific strength and specific stiffness. At present, Al-Mg-Li-X series and Al-Cu-Li-X series aluminum-lithium alloys are widely used. Thick plates and forgings are the main applications of these two types of Al-Li alloys. Due to the high recrystallization temperature of the alloy, it is difficult for the alloy to recrystallize during the hot working process and the subsequent solid solution process. Most of the grains are typical strip-shaped deformation structures, and the grain boundaries are straight. In the subsequent aging process, the precipitated phases are first precipitated at the grain boundaries to form continuous...

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
IPC IPC(8): C22C21/18C22C21/08C22F1/047C22F1/057
CPCC22C21/08C22C21/14C22C21/16C22C21/18C22F1/047C22F1/057
Inventor 陈高红李国爱汝继刚王亮
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap