Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Heat treatment method for achieving T77 three-stage aging and aviation aluminum alloy panel

A heat treatment method and three-stage aging technology, applied in the field of aluminum alloy sheet production, can solve the problems of decreased alloy strength, coarsening of intragranular strengthening particles, undisclosed specific parameters of the three-stage aging process, etc. The effect of strong damage tolerance

Inactive Publication Date: 2018-02-23
SHANDONG NANSHAN ALUMINUM +3
View PDF1 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these over-aging states not only obtain intermittently distributed grain boundary particles, but also coarsen the intragranular strengthening particles, resulting in a decrease in the strength of the alloy.
The regression reaging (RRA) three-stage aging treatment technology developed in recent years, represented by T77, can treat the grain boundary particles into an over-aged intermittent distribution state while maintaining the dispersed structure in the grain, and better realize The synergistic improvement of tensile strength and corrosion resistance is achieved, but the specific parameters of this type of three-stage aging process have not yet been disclosed

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
  • Heat treatment method for achieving T77 three-stage aging and aviation aluminum alloy panel
  • Heat treatment method for achieving T77 three-stage aging and aviation aluminum alloy panel
  • Heat treatment method for achieving T77 three-stage aging and aviation aluminum alloy panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides an aluminum alloy plate for aviation, which is prepared according to the following preparation process:

[0043] Melting: Prepare raw materials according to the alloy element composition of 7751 aluminum alloy: Zn: 10%; Mg: 2%; Cu: 2.5%; Mn: 0.4%; Zr: 0.1%; Fe: 0.3%; Si: 0.3%; the balance For Al, the aluminum alloy raw material is smelted under the condition of 720°C. When the aluminum alloy raw material is completely melted, other ingredients are added, and the slag is removed and the composition is adjusted.

[0044] Casting: pour the melt into an aluminum alloy ingot (480×1560×8650mm).

[0045] Two-stage homogenization treatment: Heat the aluminum alloy ingot to 460°C at a heating rate of 30°C / h, keep it for 25 hours, continue to heat it up to 475°C, keep it for 8 hours, and then air cool it out of the furnace.

[0046] Face milling: cut off the expansion end and gate end of the aluminum alloy ingot, and mill the upper and lower surfaces and...

Embodiment 2

[0056] This embodiment provides an aluminum alloy plate for aviation, which is prepared according to the following preparation process:

[0057] Melting: Prepare raw materials according to the alloy element composition of 7751 aluminum alloy: Zn: 6%; Mg: 1.8%; Cu: 2.2%; Mn: 0.3%; Zr: 0.06%; Fe: 0.2%; Si: 0.2%; Al. The aluminum alloy raw material is smelted at 760°C. When the aluminum alloy raw material is completely melted, other ingredients are added, and the slag is removed and the composition is adjusted.

[0058] Casting: pour the melt into an aluminum alloy ingot (480×1560×8650mm).

[0059] Two-stage homogenization treatment: Heat the aluminum alloy ingot to 470°C at a heating rate of 38°C / h, keep it for 20 hours, continue to heat it up to 480°C, hold it for 6 hours, and cool it out of the furnace in air.

[0060] Face milling: cut off the expansion end and gate end of the aluminum alloy ingot, and mill the upper and lower surfaces and both sides of the ingot; face mill...

Embodiment 3

[0070] This embodiment provides an aluminum alloy plate for aviation, which is prepared according to the following preparation process:

[0071] Melting: Prepare raw materials according to the alloy element composition of 7751 aluminum alloy: Zn: 12%; Mg: 2.2%; Cu: 2.5%; Mn: 0.5%; Zr: 0.2%; Fe: 0.5%; Si: 0.5%; For Al, the aluminum alloy raw material is smelted under the condition of 740°C. When the aluminum alloy raw material is completely melted, other ingredients are added, and the slag is removed and the composition is adjusted.

[0072] Multi-stage purification treatment: transfer the melt to the holding furnace, refine the mixed gas of Ar and Cl2 on the side of the furnace, and degas the melt through the SNIF degassing equipment; then heat the foam ceramic plates of 30PPI and 50PPI to 600 ℃, make the melt successively pass through 30PPI and 50PPI ceramic foam plates for melt filtration. After degassing and impurity removal, a modifier is added to the melt, and the mass r...

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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a heat treatment method for achieving T77 three-stage aging and an aviation aluminum alloy panel, and relates to the field of aluminum alloy panel production. The heat treatment method for achieving T77 three-stage aging includes the steps that a heating zone is heated to 120 DEG C to 140 DEG C, heat preservation is carried out for 20 min to 30 min, an aluminum plate to besubject to aging is fed into the heating zone, and first-time heating and heat preservation are carried out for 20 h to 25 h; the temperature of a heat preservation zone is increased to 180 DEG C to195 DEG C with the rate larger than 3-5 DEG C / min, and second-time heating and heat preservation are carried out for 30 min to 60 min; the aluminum plate in the heating zone is fed into a quenching zone, and water quenching is carried out to obtain the room temperature; and the aluminum plate in the quenching zone is blown to be dry and is fed into an aging furnace to be subject to third-time aging. According to the heat treatment method for achieving T77 three-stage aging, sufficient alloy solid solution can be achieved, an oversaturation solid solution object is formed, wee and even separation exists in crystals, and grain boundaries are coarsened. A prepared aviation aluminum alloy panel is high in strength and is strong in durability and damage tolerance.

Description

technical field [0001] The invention relates to the field of aluminum alloy plate production, and in particular to a heat treatment method for realizing T77 three-stage aging and an aluminum alloy plate for aviation. Background technique [0002] 7XXX series aluminum alloys (Al-Zn-Mg-Cu) have high room temperature strength and good comprehensive properties, and are indispensable structural materials in the fields of aviation, aerospace, transportation and other countries in the world. After decades of development, 7XXX series aluminum alloys have been successfully developed into 7050, 7055 and other series alloys, and have been widely used. With the increasing size of aircraft and the increasing requirements for the integration of structural parts, the requirements for various properties of materials are becoming more and more stringent. Aluminum alloys are not only required to have ultra-high strength and excellent corrosion resistance, but also require excellent fatigue r...

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): C22F1/053C22C21/10
CPCC22F1/053C22C21/10
Inventor 程仁策吕正风赵巍程志远隋信增史春丽张启东辛涛李辉余鑫祥祝贞凤
Owner SHANDONG NANSHAN ALUMINUM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com