Homogenizing heat treatment process for 6-series aluminum-magnesium-silicon alloy bar

Abstract

The invention relates to a homogeneous heat treatment process for a 6-series aluminum-magnesium-silicon alloy bar, and belongs to the technical field of 6-series aluminum-magnesium-silicon alloy heat treatment. The heat treatment process adopts three-section temperature type treatment, and specifically comprises the following steps: the first-section temperature is 347-353 DEG C, and the heat preservation time is 2.4-2.6 hours; the temperature of the second stage is 487-493 DEG C, and the heat preservation time is 2.9-3.1 h; and the temperature of the third stage is 557-563 DEG C, and the heat preservation time is 9.8-10.2 h. Compared with a traditional homogenizing heat treatment process, the method has the advantages that the structure segregation of the product is improved, dendritic crystals in an as-cast structure are basically eliminated, a non-equilibrium eutectic structure at a grain boundary is dissolved in a matrix or is changed into particles, and the eutectic phase area fraction is reduced. Component segregation does not exist in the product, and all alloy elements are evenly distributed. The improvement of the structure inevitably improves the alloy performance, the strength and plasticity of the alloy after heat treatment are improved, and the hardness and conductivity are reduced.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of 6-series aluminum-magnesium-silicon alloys, and particularly relates to a homogeneous heat-treatment process for bars of 6-series aluminum-magnesium-silicon alloys. Background technique [0002] Aluminum-magnesium-silicon alloys are 6XXX series aluminum alloys, which are heat-treated deformed aluminum alloys. However, due to the non-equilibrium eutectic phase in the as-cast aluminum alloy, the microstructure and composition are not uniform, and the subsequent deformation plasticity of the aluminum alloy is poor. This problem has become a constraint on the formability of A1-Mg-Si aluminum alloys bottleneck. In order to improve the hot workability of the as-cast aluminum alloy and fully eliminate the non-equilibrium eutectic phase in the as-cast material, a homogeneous heat treatment process is usually used. Aluminum alloys are very sensitive to homogenization heat treatment, and differe...

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Problems solved by technology

[0003] Disadvantages of the existing homogeneous heat treatment process: 1. The room temperature of the existing homogeneous heat treatment process is directly heated to 560°C, and then heat preservation is carried out. Thoroughly; 2. The copper-containing phase with low melting point cannot be fully re-dissolved

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