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A production process of 7-series aluminum alloy thick plate with high damage tolerance and low quenching sensitivity

A technology of quenching sensitivity and damage tolerance, applied in the field of aluminum alloy materials, can solve the problems of affecting the fracture toughness, fatigue performance and corrosion resistance of the sheet, restricting the application of Al-Zn-Mg-Cu alloy, and uneven distribution of coarse compounds. , to inhibit the recrystallization process, reduce adverse effects, and improve the effect of solid solution

Active Publication Date: 2021-12-28
TIANJIN ZHONGWANG ALUMINUM IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Damage tolerance is a comprehensive manifestation of strength, toughness, corrosion resistance, and fatigue crack growth resistance. Strength and toughness are a pair of contradictions. When strength is increased, toughness will be lost.
Due to the high content of alloying elements in the Al-Zn-Mg-Cu alloy, it is inevitable that there will be macro segregation, dendrite segregation, eutectic structure, and uneven distribution of coarse compounds in the ingot, which will affect the fracture toughness and fatigue of the subsequent plate. Performance and corrosion resistance, these jointly restrict the application of Al-Zn-Mg-Cu alloy
Traditional Al-Zn-Mg-Cu alloys, such as 7075, can no longer meet these needs. Therefore, it is necessary to start with composition optimization and heat treatment process improvement to develop alloys with high strength, high toughness, high stress corrosion resistance, and high hardenability. Aluminum alloy thick plate material with excellent comprehensive performance

Method used

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  • A production process of 7-series aluminum alloy thick plate with high damage tolerance and low quenching sensitivity
  • A production process of 7-series aluminum alloy thick plate with high damage tolerance and low quenching sensitivity
  • A production process of 7-series aluminum alloy thick plate with high damage tolerance and low quenching sensitivity

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Experimental program
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Effect test

Embodiment 1

[0061] A production process of Al-Zn-Mg-Cu alloy thick plate with high damage tolerance and low quenching sensitivity for aviation, including ingredients: the alloy formula is composed of the following element components according to weight percentage: Si: 0.029%, Fe: 0.072%, Cu: 1.86%, Mn: 0.002%, Mg: 1.92%, Cr: 0.003%, Zn: 8.02%, Ti: 0.027%, Zr: 0.11%, the balance is aluminum, and the Zn / Mg mass ratio is 4.2.

[0062] The ingredients of the above alloy elements are put into a smelting furnace for smelting, and after slag removal and filtration, the molten aluminum is semi-continuously cast through a crystallizer to form an aluminum alloy hot-rolled slab billet. Put the aluminum alloy slab in a homogenization furnace for homogenization treatment. The ingot is raised from room temperature to 400°C. After holding for 4 hours, it is heated to 462°C at a heating rate of less than 5°C / h. After holding for 16 hours, it is rapidly cooled in the cooling room. cool down.

[0063] The...

Embodiment 1 and comparative example 1

[0081] Table 2 Example 1 and Comparative Examples 1 to 3 Tensile and Fracture Toughness

[0082]

[0083] In Table 2: the superscript ① data is

[0084] From the test results, Example 1 has the highest tensile strength and yield strength, and the strength difference between the core and the surface layer is the smallest. Due to the higher Zn element, Zr element content and Zn / Mg mass ratio, the alloy strength The lifting effect is obvious, and the difference between the core and the surface layer of the material is significantly reduced, and the fracture toughness is relatively low, but the gap is not large. In Comparative Example 1, the Zn content and Zn / Mg mass ratio are slightly lower, but the strength drops significantly, indicating that the Zn content and Zn / Mg mass ratio have a greater impact on the strength of the alloy. The content of Zn element and Zr element in the alloy of Comparative Example 2 is the lowest and the Zn / Mg mass ratio is the smallest, resulting ...

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Abstract

The invention relates to a production process of a 7-series aluminum alloy thick plate with high damage tolerance and low quenching sensitivity, which belongs to the technical field of aluminum alloy manufacturing and comprises the following steps: aluminum ingot preparation, homogenization treatment, hot rolling, solution treatment, pre-drawing Stretching treatment and aging treatment; solution treatment includes primary solution treatment and secondary solution treatment. The invention adopts two-stage solid solution treatment, which can improve the solid solution effect of the alloy, shorten the solid solution time of the alloy in the high temperature zone, suppress its recrystallization process, and further improve the strength of the alloy and reduce its quenching sensitivity.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy materials, and relates to a production process of a 7-series aluminum alloy thick plate with high damage tolerance and low quenching sensitivity. Background technique [0002] As a heat-treatable high-strength aluminum alloy material, Al-Zn-Mg-Cu alloy has the characteristics of high strength and good machinability, and is widely used in structural materials of various aircraft. With the continuous progress of the aviation industry, the aircraft is also developing rapidly towards the trend of speed and size. At the same time, the service environment of aircraft is becoming more and more stringent. All of these put forward higher requirements for the performance of aircraft materials. The selection of aircraft materials has developed from the single pursuit of static strength of materials in the past to comprehensive performance requirements such as high strength, toughness, corrosion resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/053C21D9/00C22C21/10B21B1/38B21B3/00B21B37/58B21B37/74B21C37/02
CPCC22F1/053C21D9/0081C22C21/10C22F1/002B21B1/38B21B37/74B21B37/58B21C37/02B21B3/00B21B2001/386B21B2201/06B21B2003/001
Inventor 景子毅祖立成程素玲赵俊才付彦军赵传星白凯
Owner TIANJIN ZHONGWANG ALUMINUM IND CO LTD
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