A t7x heat treatment method for high-strength aluminum alloy rivets
A heat treatment method and technology for aluminum alloys, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problem that the riveting performance cannot meet the requirements of use, and achieve the effect of good matching, improving the matching relationship and improving the riveting performance.
Active Publication Date: 2020-06-30
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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[0003] The present invention designs a special method for T7X heat treatment of high-strength aluminum alloy rivets in order to improve the mechanical properties and riveting formability of the rivets, aiming at the fact that the riveting performance in the above-mentioned existing heat treatment process cannot meet the requirements of use. match
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[0018] (1) A high-strength aluminum alloy rivet with a specification of Φ5mm is selected, and the T7X heat treatment system of the present invention is adopted, and the obtained mechanical properties and riveting forming properties all meet the requirements. The experimental results are shown in Table 1.
[0019] Table 1
[0020]
[0021] (2) Choose high-strength aluminum alloy rivets with specifications of Φ3mm, Φ4mm, Φ5mm, and Φ6mm, adopt the secondary and tertiary aging parameters of the present invention, select the solid solution temperature at 475°C, and use 20% to 30% of the quenching liquid at 40°C to 50°C % polyglycol solution, the obtained mechanical properties and riveting formability test results all meet the design requirements. The experimental results are shown in Table 2.
[0022] Table 2
[0023]
[0024]
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The invention discloses a T7X heat treatment method of high-strength aluminum alloy rivets, and belongs to the technical field of aluminum alloy heat treatment. The T7X heat treatment method can be applied to heat treatment of the aluminum alloy rivets for aviation. A process technology of the T7X heat treatment method comprises the following steps of solid solution treatment, quenching, thermal-cold cycling and aging, and a traditional T73 heat treatment system is improved. The problems of unqualified shearing performance of the rivets and riveting cracking occur due to the facts that the internal stress of the rivets is high and toughness is reduced after the rivets obtain the high strength. In order to reduce the quenching stress of the rivets and improve riveting performance, organic solvent quenching liquid is adopted in the T7X heat treatment method, the temperature of the quenching liquid is increased to 40-50 DEG C from the traditional room temperature, and a thermal-cold cycling treatment process is additionally adopted. In order to obtain intracrystalline dispersed and refined distribution of precipitated phases and interrupted spherifying distribution of grain boundary precipitated phases, a three-step aging process is adopted in the T7X heat treatment method, and the matching relation between the performance and the toughness of the rivets is enhanced. A T7X heat treatment system suitable for the high-strength aluminum alloy rivets is obtained.
Description
technical field [0001] The invention relates to a T7X heat treatment method for high-strength aluminum alloy rivets, which belongs to the technical field of aluminum alloy heat treatment and can be applied to the heat treatment of aviation aluminum alloy rivets. Background technique [0002] High-strength aluminum alloy rivets are widely used in the aerospace field, achieving structural weight reduction, high reliability, and maintainability. The rivet needs to be heat treated after the pier head is formed, and the riveting process is performed after the heat treatment. The heat treatment process is an important process that determines the mechanical properties and riveting formability of the rivet. Improper treatment can easily cause riveting cracking. At present, there is a lack of special heat treatment system for high-strength aluminum alloy rivets in China. The existing T73 heat treatment system is: solid solution temperature: 471 ° C ~ 482 ° C, water quenching at room...
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IPC IPC(8): C22C1/04C21D9/00
CPCC21D9/0068C22C1/04
Inventor 李惠曲汝继刚郝敏臧金鑫何维维吴秀亮陈高红
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS