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Preparation process for improving comprehensive performance of aluminum-lithium alloy product

A technology of aluminum-lithium alloy and preparation process, which is applied in the field of aluminum alloy thermal deformation and heat treatment process, can solve the problems affecting the comprehensive performance of the alloy, and achieve the effect of improving the comprehensive performance, improving the morphology of the grain boundary, and not reducing the strength

Active Publication Date: 2019-11-08
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is: to propose a preparation process for improving the comprehensive performance of aluminum-lithium alloy products, so as to solve the large-size flaky "Widmanstenbergites" existing on grain boundaries and sub-grain boundaries in high-alloy content aluminum-lithium alloy plates and forgings. "Microstructure and a large number of original straight grain boundaries affect the overall performance of the alloy. Through this method, the comprehensive performance of the alloy plate such as plasticity, fracture toughness, corrosion performance, and fatigue performance can be greatly obtained without reducing the strength. promote

Method used

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  • Preparation process for improving comprehensive performance of aluminum-lithium alloy product

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Embodiment 1

[0028] Using the process for improving the comprehensive performance of aluminum-lithium alloy products involved in the present invention, the corresponding alloy components and weight percentages are: Cu 3.89%, Li 1.73%, Mg 0.38%, Zn 0.35%, Mn 0.44%, Ag 0.35%, 0.10% Zr, 0.02% Ti, 0.06% Si, 0.11% Fe, and the balance is Al. Heat a slab with a thickness of 400mm at 380°C, then hot-roll it out of the furnace, quickly roll it to 70mm, and cool it to room temperature . Subsequently, the plate is subjected to solution quenching (495°C / 7h, water quenching at room temperature), and after quenching, the plate is placed in a heating furnace for heating at a heating temperature of 220°C, kept for 12h, and then rolled to 50mm on a rolling mill. The rolled plate is subjected to secondary solution quenching (495°C / 3h, water quenching at room temperature) + pre-stretching treatment (pre-stretching deformation 4.5% to 5.5%) + artificial aging treatment (aging process 140°C to 160°C / 15~33h) ...

Embodiment 2

[0034] Adopting the process of improving the comprehensive performance of aluminum-lithium alloy products involved in the present invention, the alloy composition and weight percentage are: Cu4.2%, Li1.8%, Mg0.42%, Mn0.38%, Zn0.48%, Zr0.12 %, Ti 0.03%, Si0.06%, Fe 0.10%, the balance is Al, the round ingot with a diameter of 500mm after homogenization treatment is heated at 560°C, hot forged out of the furnace, and 20% is reserved for forging The amount of deformation, air cooling to room temperature, and then solution quenching (545 ℃ / 3h, water quenching at room temperature). The quenched forging is put into a heating furnace for heating at a heating temperature of 340°C and kept for 18 hours, then taken out for forging treatment, and stopped after reaching the predetermined size, and air-cooled to room temperature. Finally, carry out secondary solution treatment, solution temperature 550℃ / 1.5h, room temperature water quenching, after quenching, carry out 3.5~6.5% cold defor...

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Abstract

The invention relates to the technical field of aluminum alloy thermal deformation and heat treatment, and in particular relates to a preparation process for improving the comprehensive performance ofan aluminum-lithium alloy product. The preparation process comprises the following steps that after a hot rolled plate / a hot forging completed forge piece is subjected to solution and quenching treatment, heat preservation is carried out for a period of time at a certain temperature, rolling treatment of certain deformation is carried out, and then secondary solution and quenching temperature, cold deformation and artificial aging treatment are carried out; after the solution and quenching temperature is carried out, medium-temperature heating and heat preservation are carried out; and a certain deformation energy storage is introduced in subsequent medium-temperature rolling deformation rolling, so that the plate is re-crystallized to a certain degree in the secondary solution and quenching temperature, the horizontal grain boundary among grains in the hot rolled plate is eliminated, a part of " nested " morphology is formed, improvement is achieved from two aspects of grain boundarymorphology and interface " purity ", and the comprehensive performance of an alloy is improved.

Description

technical field [0001] The invention relates to aluminum alloy thermal deformation and heat treatment processes, in particular to a preparation process for improving the comprehensive performance of aluminum-lithium alloy products, in particular to a preparation process for improving the comprehensive performance of aluminum-lithium alloy plates and forgings. Background technique [0002] With the continuous development of high reliability and high weight reduction requirements in the aerospace field, aluminum-lithium alloys with high specific stiffness, high specific strength and excellent damage resistance have gradually become important materials for the above-mentioned fields. In order to further reduce the density and improve the strength, it has become the development trend of high-performance aluminum-lithium alloys to increase the content of Li and Cu while adopting multi-element microalloying. However, as the content of Cu and Li increases, the coarse and large need...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/057
CPCC22F1/002C22F1/057
Inventor 李国爱郝敏陈高红吴秀亮陆政
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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