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Multi-stage spray quenching process for achieving low residual stress of age hardening aluminum alloy

A technology of aging hardening and aluminum alloy, which is applied in the field of heat treatment of aluminum alloy and non-ferrous metal materials, and achieves the effect of simple process method and low hardenability

Active Publication Date: 2014-12-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a multi-stage spray quenching process for age-hardening aluminum alloys with low residual stress that can not only ensure the hardening of age-hardening aluminum alloy materials but also effectively reduce the residual stress of quenching

Method used

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  • Multi-stage spray quenching process for achieving low residual stress of age hardening aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]The size of the 7050 aluminum alloy thick plate is 80mm×500mm×1500mm. After solution treatment at 470°C×4 hours, it is subjected to multi-stage spray quenching, and enters the first-stage spray quenching area at a uniform speed of 240mm / s. The pressure leaving the nozzle is 300kPa, and the flow density of the spray water on the aluminum alloy plate is 100Lm -2 s -1 , after 5s, enter the second-stage spray quenching area, the pressure of the water leaving the nozzle in this area is 10kPa, and the flow density of the spray water on the aluminum alloy thick plate is 25Lm -2 s -1 , After 5s, enter the third-level air-cooling area, stop spraying water, and let it stand to room temperature. The average value of residual compressive stress on the surface obtained from the test is 144.6MPa. After the sample is subjected to T74 aging treatment, the average Vickers hardness of the core is 164.

Embodiment 2

[0041] The size of the 7050 aluminum alloy thick plate is 120mm×500mm×1500mm. After solution treatment at 470°C×4 hours, it is subjected to multi-stage spray quenching, and enters the first-stage spray quenching area at a uniform speed of 150mm / s. The pressure leaving the nozzle is 400kPa, and the flow density of the spray water on the aluminum alloy plate is 125Lm -2 s -1 , after 8s, enter the second-stage spray quenching area, the pressure of the water leaving the nozzle in this area is 20kPa, and the flow density of the spray water on the aluminum alloy thick plate is 35Lm -2 s -1 After 8 seconds, enter the third-level air-cooling area, stop spraying water, and let it stand to room temperature. The average value of the surface residual stress obtained from the test is 189.5MPa. After the sample has undergone T74 aging treatment, the average Vickers hardness of the core is 162.

Embodiment 3

[0045] The size of the 7050 aluminum alloy thick plate is 150mm×500mm×1500mm. After solution treatment at 470°C×4 hours, it is subjected to multi-stage spray quenching, and enters the first-stage spray quenching area at a uniform speed of 120mm / s. The pressure leaving the nozzle is 500kPa, and the flow density of the spray water on the aluminum alloy plate is 150Lm -2 s -1 , after 10s, enter the second-stage spray quenching area, the pressure of the water leaving the nozzle in this area is 25kPa, and the flow density of the spray water on the aluminum alloy thick plate is 60Lm -2 s -1 After 10s, enter the third-level air-cooling area, stop spraying water, and let it stand to room temperature. The average value of surface residual stress obtained from the test is 222.2MPa. After the sample has undergone T74 aging treatment, the average Vickers hardness of the core is 162.

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Abstract

The invention relates to a multi-stage spray quenching process for achieving the low residual stress of an age hardening aluminum alloy. The material of the age hardening aluminum alloy is thermally insulated at the solution temperature, three stages of cooling with different surface cooling speeds are sequentially and continuously conducted, a first-stage surface cooling speed is at least up to 40 DEG C / s, a second-stage surface cooling speed is 10-20 DEG C / s, and a third-stage cooling is naturally cooled in the air to the room temperature. The first-stage cooling and the second-stage cooling adopt spray cooling, and the cooling medium is water. Compared with a single-stage spray quenching method, the multi-stage spray quenching effectively reduces the quenching residual stress on the premise of guaranteeing that the core of the material is quenched through. The process provided by the invention is simple in method and convenient in operation, the quenching degree and the lower quenching residual stress of the age hardening aluminum alloy are guaranteed, and the process is suitable for industrial production and is of great significance for the production of age hardening aluminum low-residual-stress boards, sectional materials and forge pieces.

Description

technical field [0001] The invention relates to a multi-stage spray quenching process for aluminum alloy materials, in particular to a multi-stage spray quenching process for age-hardened aluminum alloys with low residual stress, and belongs to the technical field of heat treatment of non-ferrous metal materials, in particular to the heat treatment technology for aluminum alloys field. Background technique [0002] With the continuous improvement of material performance requirements of modern aircraft, the structural design of aircraft tends to adopt large-scale high-precision integral structural parts, which require age-hardening high-performance aluminum alloy materials with low residual stress. The so-called age-hardening aluminum alloy needs to be quenched to room temperature after high temperature solution heat treatment to form a supersaturated solid solution, and then undergo aging treatment to decompose the supersaturated solid solution, precipitate the aging strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053C22F1/057
Inventor 陈康华娄瑾陈送义祝昌军叶升平
Owner CENT SOUTH UNIV
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