Heat treatment method for spray forming of 7055 aluminium alloy

A heat treatment method and spray forming technology, applied in the field of aluminum alloy processing technology, can solve the problems of difficulty in ensuring material strength, increase in the coarsening rate of precipitated phases, and difficult control of regression time, etc., and achieve long holding time, small performance fluctuations, and high strength and toughness Effect

Active Publication Date: 2019-07-05
JIANGSU HAORAN SPRAY FORMING ALLOY
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  • Abstract
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Problems solved by technology

[0005] At present, the heat treatment process of spray-formed 7055 aluminum alloy is mostly focused on the T6, T73, T74, T76, T77 heat treatment process for the traditional cast Al-Zn-Mg-Cu alloy, but these heat treatment processes are difficult to maintain the high strength of the alloy. , especially with high plasticity at the same time of yield strength, such as achieving the performance index of 7055 aluminum alloy with yield strength greater than 700MPa and elongation at break higher than 10%
Chinese patent CN103911568A proposes a heat treatment method suitable for spray forming Al-Zn-Mg-Cu ultra-high-strength aluminum alloys, that is, regression reaging treatment through underaging pretreatment + high temperature regression treatment + peak aging retreatment method to obtain higher strength and corrosion resistance. This heat treatment process makes the yield strength of spray-formed 7055 aluminum alloy reach 700MPa, but the peak aging at 120°C after regression treatment is not conducive to the high plasticity of the material, and the tensile elongation of the material Only around 8%
In addition, since the regression treatment temperature in this process is above 200 °C, the coarsening rate of the precipitated phase is greatly increased, and it is difficult to control the regression time in actual production, so it is difficult to ensure that the material has a stable strength

Method used

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  • Heat treatment method for spray forming of 7055 aluminium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052]Example 1: Two specifications of extruded materials are first-level solid solution: heat preservation at 450° C. for 3 hours. Secondary solid solution: raise the temperature to 475°C for 3 hours in half an hour, and then quench in water. Under-aging pretreatment: the quenched material is kept at 120°C for 6 hours and then water-quenched to room temperature. Regression treatment: followed by holding at 170°C for 2 hours and then water quenching to room temperature. Low temperature re-aging treatment: followed by heat preservation at 45°C for 200 hours. After the heat treatment, the tensile test is carried out on the material, and the tensile strength, yield strength and elongation at break of the material are measured.

Embodiment 2

[0053] Example 2: two specifications of extruded material primary solid solution: heat preservation at 450°C for 3 hours. Secondary solid solution: raise the temperature to 475°C for 3 hours in half an hour, and then quench in water. Under-aging pretreatment: the quenched material is kept at 120°C for 9 hours and then water-quenched to room temperature. Regression treatment: followed by holding at 180°C for 70 minutes and then water quenching to room temperature. Low temperature re-aging treatment: followed by heat preservation at 65°C for 168 hours. After the heat treatment, the tensile test is carried out on the material, and the tensile strength, yield strength and elongation at break of the material are measured.

Embodiment 3

[0054] Example 3: First-level solid solution of two specifications of extruded materials: heat preservation at 450° C. for 3 hours. Secondary solid solution: raise the temperature to 475°C for 3 hours in half an hour, and then quench in water. Under-aging pretreatment: the quenched material is kept at 120°C for 12 hours and then water-quenched to room temperature. Regression treatment: followed by holding at 190°C for 50 minutes and then water quenching to room temperature. Low temperature re-aging treatment: followed by heat preservation at 85°C for 60 hours. After the heat treatment, the tensile test is carried out on the material, and the tensile strength, yield strength and elongation at break of the material are measured.

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Abstract

The invention provides a heat treatment method for spray forming of a 7055 aluminium alloy. The heat treatment method includes the following steps of two-stage solid solution, retrogression low temperature reageing treatment, underaging pretreatment, regression treatment and low temperature reageing treatment. The two-stage solid solution comprises first-stage solid solution and second-stage solidsolution. Underaging is used as pretreatment before regression treatment, the number of eta phases in an alloy matrix is controlled, only a small amount of the eta phases are generated in the matrix,and thus it is guaranteed that the material has certain yield strength, subsequent regression treatment redissolves most of the GP regions in the matrix into the matrix, and the organization is prepared for a large number of dispersed GP regions precipitated by low temperature reaging. Meanwhile, regression treatment also avoids the aging process needing to take a long time to strengthen the phases in a single GP region to achieve the high strength and toughness of the 7055 aluminum alloy.

Description

technical field [0001] The invention belongs to an aluminum alloy treatment process, in particular to a heat treatment method for a spray-formed 7055 aluminum alloy. Background technique [0002] 7055 aluminum alloy is an Al-Zn-Mg-Cu series heat-treatable and strengthened ultra-high-strength aluminum alloy. Compared with other 7000-series aluminum alloys, 7055 aluminum alloy has higher strength and good comprehensive performance, commonly known as "ace". Aluminum alloys have been widely used in the aerospace field. [0003] The 7055 aluminum alloy can obtain different mechanical properties through the adjustment of the heat treatment process. This is mainly through the adjustment of the number, distribution and size of the precipitated phase particles through the heat treatment aging process to regulate the mechanical properties and corrosion resistance of the material. For example, Alcoa has successively developed T73, T76, T74 and T77 aging processes for 7000 series alumi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053
CPCC22F1/002C22F1/053
Inventor 汤志浩张豪张捷马万太范曦
Owner JIANGSU HAORAN SPRAY FORMING ALLOY
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