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Heat treatment technique of thick-wall aluminum alloy hollow extruded section

A technology for extruded profiles and aluminum alloys, which is applied in the field of heat treatment of Al–Zn–Mg series deformed aluminum alloy extruded profiles, can solve the problems of unsuitable heat treatment for large cross-sections and thick parts, and achieve inhibition of recrystallization and crystal grains Coarse, increase supersaturation, eliminate the effect of tissue internal stress

Active Publication Date: 2016-05-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the regression treatment in this system is not suitable for heat treatment of large cross-section and thick parts due to the characteristics of high temperature and short time
In the literature that has been reported so far, there is no relevant heat treatment process that can make the strength of thick-walled aluminum alloy hollow extrusion profiles exceed 400MPa, and still have excellent ductility and corrosion resistance

Method used

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  • Heat treatment technique of thick-wall aluminum alloy hollow extruded section
  • Heat treatment technique of thick-wall aluminum alloy hollow extruded section
  • Heat treatment technique of thick-wall aluminum alloy hollow extruded section

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Experimental program
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Effect test

Embodiment 1

[0060] In this embodiment, the components (wt.%) are: Zn3.5~3.8; Mg1.2~1.5; Cu0.08~0.10; Fe0.06~0.10; Si0.10~0.15; Mn0.30~0.35; Cr0. 18~0.22; Zr0.10~0.15; Ti0.04~0.06; V0.01~0.03; the total of other impurity elements≤0.20; the balance is Al, the aluminum alloy hollow extrusion profile for rail transit is heated to 430 ℃ for heat preservation 5h, continue to heat to 480°C for 2h, the heating time is 45min, then take out of the oven, cool to room temperature with strong wind; after artificial aging at 120°C for 40 minutes, cool to room temperature with strong wind; after artificial aging at 65°C for 7 days, take out of the oven and cool in air; Artificial aging at 120°C for 40h, heating time for 1h10min, then out of the oven, natural air cooling. Tensile samples were cut along the extrusion direction of the profile to measure the tensile properties of the alloy at room temperature.

[0061] Such as figure 1 As shown in the 2# curve, the strength of the alloy has increased sign...

Embodiment 2

[0063] In this embodiment, the components (wt.%) are: Zn3.5~3.8; Mg1.2~1.5; Cu0.08~0.10; Fe0.06~0.10; Si0.10~0.15; Mn0.30~0.35; Cr0. 18~0.22; Zr0.10~0.15; Ti0.04~0.06; V0.01~0.03; the total of other impurity elements ≤0.20; the balance is Al aluminum alloy hollow extruded profiles for rail transit, and the temperature is raised to 420 ℃ for heat preservation 5h, continue to heat to 480°C for 2h, the heating time is 50min, then take it out of the furnace, and cool it to room temperature with strong wind; after artificial aging at 115°C for 90 minutes, cool it to room temperature with strong wind; Artificial aging at 115°C for 48 hours, heating time for 1 hour, then out of the oven, and natural air cooling. Tensile samples were cut along the extrusion direction of the profile to measure the tensile properties of the alloy at room temperature.

[0064] Such as figure 1 As shown in the 3# curve, the yield strength of the alloy is 383.0MPa, the tensile strength is 453.0MPa, the e...

Embodiment 3

[0066] In this embodiment, the components (wt.%) are: Zn3.5~3.8; Mg1.2~1.5; Cu0.08~0.10; Fe0.06~0.10; Si0.10~0.15; Mn0.30~0.35; Cr0. 18~0.22; Zr0.10~0.15; Ti0.04~0.06; V0.01~0.03; the total of other impurity elements ≤0.20; the balance of aluminum alloy hollow extrusion profiles for rail transit is heated to 400 ℃ for heat preservation 8h, continue to heat up to 490°C for 1.5h, the heating time is 1.5h, then take it out of the oven, and cool it to room temperature with strong wind; after artificial aging at 120°C for 60 minutes, take it out of the oven and cool it to room temperature with strong wind; after artificial aging at 65°C for 10 days, take it out of the oven and cool it in air ; Then artificial aging at 120 ℃ for 42 hours, heating time is 1h15min, then out of the oven, natural air cooling. Tensile samples were cut along the extrusion direction of the profile, and the tensile properties of the alloy at room temperature were measured, and the exfoliation corrosion test...

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Abstract

The invention relates to a heat treatment technique of a thick-wall aluminum alloy hollow extruded section. After double-stage reinforced solution treatment is carried out on the aluminum alloy section, three-stage artificial aging is sequentially carried out. By adopting the double-stage reinforced solution treatment, part of soluble phases can be firstly dissolved, thereby lowering the stored energy of deformation of the alloy, eliminating most stress in the structure, and inhibiting the subsequent recrystallization and coarse crystal grains; and the second phase and insoluble phase in the structure are further dissolved, thereby enhancing the degree of supersaturation of the quenched alloy. The three-stage aging treatment is implemented by interrupting the traditional single-stage aging, so that the alloy has the structure characteristics of the dispersive and fine intracrystalline precipitated phase and the isolated and discontinuous grain boundary precipitated phase; and the three-stage aging treatment intercepts the intercrystalline corrosion channel and enhances the corrosion resistance of the alloy. Compared with the traditional technique, the technique provided by the invention enhances the strength of the aluminum alloy section by 15% or above on the premise of not lowering the plasticity, obviously improves the corrosion resistance, and is simple and easy to implement and convenient for industrial production. The technique is especially suitable for heat treatment reinforcement of aluminum alloy hollow extruded sections for rail transit.

Description

technical field [0001] The invention relates to a heat treatment process of a thick-walled aluminum alloy hollow extruded profile, belongs to the technical field of heat treatment of aluminum alloy materials, and in particular relates to a heat treatment process of an Al-Zn-Mg series deformed aluminum alloy extruded profile. Background technique [0002] Al–Zn–Mg series deformed aluminum alloys, because of their high strength, good plasticity, weldability and heat treatment strengthening, are used to extrude profiles to make high-strength, high-toughness welded structural stress parts, such as rail transit vehicles traction beams, frame bolsters, large heat exchanger components, etc. Sports bikes, tennis racquets, and softball bats can also be made. Therefore, the quality requirements are strict. [0003] Although the Al–Zn–Mg series deformed aluminum alloy is a member of the 7xxx series aluminum alloy family, its strength is insufficient due to the low degree of alloying,...

Claims

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Application Information

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IPC IPC(8): C22F1/053C22C21/10
CPCC22C21/10C22F1/053
Inventor 李慧中姚三成梁霄鹏李鹏伟朱泽晓
Owner CENT SOUTH UNIV
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