Heating processing process for improving ageing strengthening type Al-Mg-Zn alloy intergranular corrosion performance

A technology of intergranular corrosion and al-mg-zn, which is applied in the field of aluminum alloy heat treatment, can solve the problems such as the decrease of alloy intergranular corrosion resistance, achieve improved intergranular corrosion resistance, high elongation, good research and application prospects Effect

Active Publication Date: 2017-08-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Invention patent (Patent No. ZL201410577461.5) on the basis of AA5059 alloy, further increases the content of Zn in the alloy, changes the strengthening method of traditional 5xxx alloys, that is, transforms from traditional solid solution s

Method used

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  • Heating processing process for improving ageing strengthening type Al-Mg-Zn alloy intergranular corrosion performance
  • Heating processing process for improving ageing strengthening type Al-Mg-Zn alloy intergranular corrosion performance
  • Heating processing process for improving ageing strengthening type Al-Mg-Zn alloy intergranular corrosion performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Al-Mg-Zn alloy samples were solid-dissolved at 530°C for 10 minutes, quenched with water to room temperature, and placed directly in a resistance heating furnace at 390°C after quenching for 1 hour, then quenched with water and then 90°C / 24h T6 peak aging at +140°C / 25h. After aging, hardness, tensile test and intergranular corrosion were measured. The experimental results are shown in Table 3.

Embodiment 2

[0028] Example 2: Al-Mg-Zn alloy samples were solid-dissolved at 530°C for 10 minutes, quenched with water to room temperature, and placed in a resistance heating furnace at 400°C after quenching for 1 hour, taken out and quenched with water, then carried out at 90°C / 24h T6 peak aging at +140°C / 25h. After aging, hardness, tensile test and intergranular corrosion were measured. The experimental results are shown in Table 3.

Embodiment 3

[0029] Example 3: Al-Mg-Zn alloy samples were solid-dissolved at 530°C for 10 minutes, quenched with water to room temperature, and placed directly in a resistance heating furnace at 410°C after quenching for 1 hour, taken out and quenched with water for 90°C / 24h T6 peak aging at +140°C / 25h. After aging, hardness, tensile test and intergranular corrosion were measured. The experimental results are shown in Table 3.

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Abstract

The invention relates to a heating processing process for improving ageing strengthening type Al-Mg-Zn alloy intergranular corrosion performance, and belongs to the field of nonferrous metal and preparation of the nonferrous metal. According to the heating processing process, after an ageing strengthening type Al-Mg-Zn alloy is subject to solution hardening treatment, high temperature preageing treatment is carried out, in other words, heat preservation is carried out for 10 min to 3 h at the temperature ranging from 380 DEG C to 450 DEG C, quick quenching is carried out to the room temperature, then T6 peak aging treatment is carried out, two-step aging is carried out, heat preservation is firstly carried out for 12 h to 36 h at the temperature ranging from 60 DEG C to 100 DEG C, then heat preservation is carried out for 10 h to 40 h at the temperature ranging from 110 DEG C to 160 DEG C, and cooling is carried out to the room temperature. According to the heating processing process, alloy crystal boundary and crystal interior microstructures are changed, on the premise that the alloy strength and the extending rate are basically not lost, and the alloy intergranular corrosion resistance is remarkably improved; and in addition, compared with a traditional retrogression and reaging process, the process flow is greatly shortened, and industrial production is facilitated. The heating processing process has the important reference value on developing the novel high-strength corrosion-resistant ship and armored vehicle ageing strengthening type Al-Mg-Zn alloy.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of aluminum alloys, and in particular relates to a heat treatment method for improving the intergranular corrosion performance of an aging-strengthened Al-Mg-Zn alloy and ensuring that its strength and elongation are not substantially reduced. Background technique [0002] It is an inevitable development trend to improve the fuel efficiency of large vehicles and reduce their structural weight. 5xxx aluminum alloys are aluminum alloys with Mg as the main alloying element. This series of alloys cannot be strengthened by heat treatment. The alloy can only be strengthened by solid solution strengthening and cold work hardening of Mg element. High Mg 5xxx series aluminum alloy has good corrosion resistance, formability, weldability and medium strength, and is one of the best choices for armor and ship weight reduction plates. For example, the 5xxx series aluminum alloys in the state of H321 and...

Claims

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Application Information

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IPC IPC(8): C22F1/047C22C21/08C22C21/06
CPCC22C21/06C22C21/08C22F1/047
Inventor 张迪候胜利张济山庄林忠
Owner UNIV OF SCI & TECH BEIJING
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