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High-speed rail train body Al-zinc-Mg alloy profile aging heat treatment method

A technology of aging heat treatment and alloy profiles, which is applied in the field of aluminum alloy processing, can solve the problems of inability to meet the requirements of high-speed railway car bodies, insufficient fracture toughness and fatigue resistance, and reduce the fracture toughness of products, so as to achieve high fracture toughness and fatigue resistance High performance and high performance

Inactive Publication Date: 2015-08-12
广西南南铝加工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the aging heat treatment process adopted by the Al-Zn-Mg alloy profiles for high-speed rail car bodies in industrial production can guarantee the mechanical properties of the alloy, but there are problems such as low corrosion resistance, insufficient fracture toughness and fatigue strength, which cannot meet the requirements Requirements for the use of high-speed railway car bodies
[0003] Technical disadvantages of the existing aging process: single-stage or double-stage aging process is currently used in industrial production
However, because the high temperature aging stage of T73 and T74 products takes a long time, the strength loss is too large and the fracture toughness of the product is reduced

Method used

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  • High-speed rail train body Al-zinc-Mg alloy profile aging heat treatment method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The aging heat treatment method of Al-Zn-Mg alloy profiles for high-speed rail car bodies is carried out sequentially after the Al-Zn-Mg alloy profiles are extruded (extrusion temperature 450°C, extrusion speed 2m / min) and on-line water cooling and quenching. Low-temperature aging, second-level aging and third-level aging treatment, namely: first put the alloy profile into the heating device for heat preservation treatment, the heat preservation temperature is 30 ℃, and the heat preservation time is 48 hours; then the alloy profile is heated in the heating device to 65°C and keep it warm for 15 hours; finally, raise the temperature of the alloy profile to 120°C in the heating device and keep it warm for 30 hours.

Embodiment 2

[0017] The aging heat treatment method of Al-Zn-Mg alloy profiles for high-speed rail car bodies is carried out sequentially after the Al-Zn-Mg alloy profiles are extruded (extrusion temperature 450°C, extrusion speed 2m / min) and on-line water cooling and quenching. Low-temperature aging, second-level aging and third-level aging treatment, namely: first put the alloy profile into the heating device for heat preservation treatment, the heat preservation temperature is 40 ℃, and the heat preservation time is 480 hours; then the alloy profile is heated in the heating device to 120°C and keep it warm for 8 hours; finally, raise the temperature of the alloy profile to 120°C in the heating device and keep it warm for 30 hours.

Embodiment 3

[0019] The aging heat treatment method of Al-Zn-Mg alloy profiles for high-speed rail car bodies is carried out sequentially after the Al-Zn-Mg alloy profiles are extruded (extrusion temperature 450°C, extrusion speed 2m / min) and on-line water cooling and quenching. Low-temperature aging, second-level aging and third-level aging treatment, namely: first put the alloy profile into the heating device for heat preservation treatment, the heat preservation temperature is 20°C, and the heat preservation time is 720 hours; then the alloy profile is heated in the heating device to 150°C and keep it warm for 8 hours; finally, raise the temperature of the alloy profile to 100°C in the heating device and keep it warm for 60 hours.

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Abstract

The invention discloses a high-speed rail train body Al-zinc-Mg alloy profile aging heat treatment method, and relates to aluminum alloy processing technical field. The method includes low temperature aging, secondary aging and tertiary aging three parts, the aging temperature of the low temperature aging is 20-50 DEG C, the aging time of the low temperature aging is 24-720 hours; the temperature of the secondary aging is 50-150 DEG C, the aging time of the secondary aging is 5 to 40 hours; the tertiary aging temperature is 100-200 DEG C, and the tertiary aging time is 2 to 60 hours. The aging heat treatment method ensures the profile has good strength, high resistance to stress corrosion, high fracture toughness and fatigue resistance performance and other comprehensive performances, and can fully meet the technical requirements of high strength, high toughness, corrosion resistance and high fatigue resistance of a high-speed rail train body Al-zinc-Mg alloy.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy processing, in particular to an aging heat treatment method for Al-Zn-Mg alloy profiles for high-speed rail car bodies. Background technique [0002] Al-Zn-Mg alloy has high strength and excellent welding performance, and has become one of the main structural materials of high-speed railway car bodies. The use of Al-Zn-Mg alloy as the profile for the high-speed rail car body can not only ensure the strength of the car body, but also greatly reduce the weight of the car and effectively reduce energy consumption. At present, the aging heat treatment process adopted by the Al-Zn-Mg alloy profiles for high-speed rail car bodies in industrial production can guarantee the mechanical properties of the alloy, but there are problems such as low corrosion resistance, insufficient fracture toughness and fatigue strength, which cannot meet the requirements Requirements for the use of high-speed railwa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053
Inventor 张新明周文标乐永康谢尚昇李剑赵巍向晶覃珊何锋
Owner 广西南南铝加工有限公司