A homogeneous heat treatment process for aluminum alloys used in aviation

A technology of homogenization heat treatment and homogenization treatment, applied in the field of high-strength aluminum alloy heat treatment, can solve problems such as affecting production efficiency and slow heating speed, and achieve the effects of improving productivity, reducing total time, and improving homogenization effect.

Active Publication Date: 2018-12-18
江苏华昌铝厂有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of multi-stage heat treatment, the production efficiency is often affected due to the slow heating rate.

Method used

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  • A homogeneous heat treatment process for aluminum alloys used in aviation
  • A homogeneous heat treatment process for aluminum alloys used in aviation
  • A homogeneous heat treatment process for aluminum alloys used in aviation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0045] The aluminum alloy casting ingot for aviation has good effect after homogenization treatment at 420℃×8h+450℃×8h+475℃×12h. Compared with the as-cast structure, the coarse eutectic structure at the grain boundary basically disappears, and only a small amount of structure It is no longer continuous, disconnected, granular or short-line, and the grain boundary is no longer obvious. After energy spectrum analysis, the energy spectrum analysis results are shown in Table 2. Zn element diffusion is completed, and the grain boundary no longer contains Zn element. The granular and short-line elements are mainly Al, Cu, and Mg, and there is no more brittle T phase, mainly composed of S phase and θ phase.

[0046] Table 2 Energy spectrum analysis results of homogenized three-stage heat treatment process

[0047] Element

Embodiment example 2

[0049] The aluminum alloy casting ingot for aviation has good effect after homogenization treatment at 420℃×7h+450℃×7h+475℃×11h. Compared with the as-cast structure, the coarse eutectic structure at the grain boundary basically disappears, and only a small amount of structure It is no longer continuous, disconnected, granular or short-line, and the grain boundary is no longer obvious. After energy spectrum analysis, the results of energy spectrum analysis are shown in Table 3. The Zn element has basically diffused, and the content is extremely low. The grain boundary is granular and short-line The main elements are Al, Cu, Mg, no more brittle T phase, mainly composed of S phase and θ phase.

[0050] Table 3 Energy spectrum analysis results of homogenized three-stage heat treatment process

[0051] Element

Embodiment 3

[0053] The aluminum alloy ingot for aviation use is homogenized at 420℃×6h+450℃×6h+475℃×10h, and the effect is good. Compared with the as-cast structure, the coarse eutectic structure at the grain boundary basically disappears, and only a small amount of structure It is no longer continuous, disconnected, granular or short-line, and the grain boundary is no longer obvious. After energy spectrum analysis, the energy spectrum analysis results are shown in Table 3. Zn element diffusion is completed, and the grain boundary no longer contains Zn element. The granular and short-line elements are mainly Al, Cu, and Mg, and there is no more brittle T phase, mainly composed of S phase and θ phase.

[0054] Table 4 Homogenized three-stage heat treatment process energy spectrum analysis results

[0055] Element

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Abstract

The invention discloses a homogenizing thermal treatment process for 7-series aluminum alloy for aviation. A three-stage homogenizing thermal treatment method is adopted, cast ingot internal stress can be eliminated at the first stage, a low melting point phase disappears, the final homogenizing temperature is raised to be slightly higher than a T-phase melting point, and a cast ingot can achieve high-temperature homogenizing without being overburnt. The total time in the homogenizing process is shortened, the homogenizing effect is improved, the method of increasing the temperature rise rate through metal constant temperature is adopted, therefore, production efficiency can be improved, and an energy saving effect is achieved.

Description

technical field [0001] The invention relates to a heat treatment method for high-strength aluminum alloys, in particular to a homogenization heat treatment process for aluminum alloys used in aviation, which can increase the heating rate, shorten the homogenization time, and improve productivity Background technique [0002] The main characteristics of aviation aluminum alloys are high alloy content, many components, complex phases after smelting and casting, and brittle eutectic compounds distributed on the grain boundaries. In order to ensure the production and processing of sheet metal and parts, it is necessary to perform homogenization annealing on the ingot . [0003] The higher the temperature, the higher the homogenization effect, and the shorter the time required, but there is a T phase with a low melting point in the aluminum alloy ingot. In order to prevent overburning, the traditional homogenization annealing process is below the melting point of the T phase, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/053C22C21/10
CPCC22C21/10C22F1/002C22F1/053
Inventor 房洪杰史春丽孙杰初晋华戴菡孙伟力张倩赵俊凤
Owner 江苏华昌铝厂有限公司
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