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A method for improving the fatigue performance of high-strength aluminum alloy

A fatigue performance, aluminum alloy technology, applied in furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of re-solid solution of refractory phase, difficulty of refractory phase, reducing fatigue strength of aluminum alloy matrix, etc., to achieve easy promotion, Simple preparation method and strong practicability

Active Publication Date: 2022-02-18
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, large-sized inclusions or refractory phases tend to be the source of fatigue cracks, such as some Fe and Si intermetallic compounds containing impurity elements, especially inclusions or refractory phases with a size larger than 5 μm will greatly reduce The fatigue strength of the aluminum alloy matrix
[0004] However, it is not easy to eliminate the refractory phase. In the homogenization process or solution heat treatment process, the temperature used is difficult to re-dissolve some refractory phases back into the aluminum alloy matrix. Phase measures include improving the purity of raw materials, using filtering devices, and crushing coarse refractory materials into smaller particles through processing and deformation.

Method used

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  • A method for improving the fatigue performance of high-strength aluminum alloy
  • A method for improving the fatigue performance of high-strength aluminum alloy

Examples

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Embodiment 1

[0036] Embodiment 1: traditional craft

[0037] Melt, refine and cast the above proportioned alloys, and carry out solid solution treatment after the wagon. The solid solution treatment usually adopts two-stage treatment, heat preservation at 470 degrees for 1 hour, then heat preservation at 485 degrees for 2 hours, then quench at room temperature, and then place at room temperature Natural aging, that is, T4 heat treatment process, with the prolongation of the storage time, the strength of the alloy continues to increase, the tensile strength can reach more than 340MPa, and the fatigue strength is about 112MPa. figure 2 (a) is the metallographic structure obtained by the traditional preparation process.

Embodiment 2

[0038] Embodiment 2: process of the present invention

[0039]The present invention differs from Example 1 in that: before the above-mentioned solution heat treatment, the aluminum alloy is first heated to 250°C, and after being heated evenly, it is taken out and quickly twisted for a week before being put back into the furnace for the same process as in (1). Solid solution process, then water quenching at room temperature, and then natural aging. The tensile strength of the final product can reach 362MPa, and the fatigue strength can be increased to about 120MPa. figure 2 (b) is the metallographic structure obtained by using the present invention. Compared with (a), it can be found that the grains are obviously refined, which is attributed to the formation of a large number of dislocations in the twisting process, and a large number of recrystallized fine grains in the subsequent heat treatment process. crystallized.

Embodiment 3

[0040] Embodiment 3: process of the present invention

[0041] Similar to Example (2), the difference is that the aluminum alloy is heated to 400°C. After the heating is even, take it out and continue to twist it for two weeks, then put it back into the furnace for the same solid solution process as (1), and then quench it in water at room temperature , and then naturally aged. The tensile strength of the final product can reach 365MPa, and the fatigue strength can be increased to about 122MPa.

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Abstract

The invention belongs to the field of metal materials, and relates to a method for improving the fatigue performance of high-strength aluminum alloys. Before the solution heat treatment of the aluminum alloy bar, first heat the aluminum alloy to a certain temperature, generally not higher than 400 ℃, use a clamp to clamp the two ends of the aluminum alloy bar, and perform mechanical twisting, which can be twisted one or more times. , the torsion device has a clamping part that prevents flexural deformation during the torsion process. The large-sized inclusions or refractory phases are crushed by twisting to achieve the purpose of reducing the size of inclusions or refractory phases, the size of inclusions or refractory phases is controlled within a certain range, and the grains are refined by recrystallization. , to improve the fatigue properties and mechanical properties of the final product.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a method for improving the fatigue performance of high-strength aluminum alloys. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] With the continuous improvement of the strength of aluminum alloys, it is more and more widely used in industries such as transportation, such as Al-Mg-Zn series aluminum alloys. However, in the process of use, it is found that the aluminum alloy structural materials with high alloy elements have a complex external environment, high load, frequent acceleration and deceleration and other harsh environments, which may cause early fatigue fail...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/04C21D9/00
CPCC22F1/04C22F1/002C21D9/0075
Inventor 王瑫邹勇赵冠琳吴东亭郭富强
Owner SHANDONG UNIV