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A high-temperature rapid homogenization treatment method for 7000 series aluminum alloy

A homogenization treatment, high temperature and rapid technology, applied in the field of heat treatment of metal materials, can solve the problems of many residual intergranular, low production efficiency, low homogenization temperature, etc., to achieve high heat treatment efficiency, short heat treatment time, high homogenization temperature Effect

Active Publication Date: 2015-08-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common characteristics of common homogenization treatment are: the homogenization temperature is relatively low, both at T m Below, there are many residual intergranular phases; the processing cycle is basically 20~30h or even longer, and the production efficiency is low

Method used

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  • A high-temperature rapid homogenization treatment method for 7000 series aluminum alloy
  • A high-temperature rapid homogenization treatment method for 7000 series aluminum alloy
  • A high-temperature rapid homogenization treatment method for 7000 series aluminum alloy

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Experimental program
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Effect test

Embodiment 1

[0033] The above-mentioned 7050 aluminum alloy adopts the homogenization system of the inventive method to carry out heat treatment, and concrete technology is:

[0034] (1) Through differential scanning calorimetry (DSC), it is determined that the above-mentioned 7050 aluminum alloy has two low-melting eutectic melting endothermic peaks at 478°C and 488°C, which are taken as T m =478°C.

[0035] (2) Heat the ingot from room temperature to 485°C at 10°C / min, and keep it at 485°C for different times. The attenuation curve of the intergranular phase content during the ingot holding process is as follows: figure 2As shown, it can be seen that 3 hours of heat preservation can basically control the intergranular phase content below 0.638.area%, indicating that the high-temperature homogenization proposed by the present invention can accelerate the dissolution rate of the intergranular phase, and its efficiency is significantly higher than that of the existing homogenization proc...

Embodiment 2

[0040] Homogenize the Al-6.68Zn-2.38Mg-2.41Cu aluminum alloy using the homogenization treatment system of the method of the present invention. The specific process is: heat the ingot from room temperature to 480°C at 10°C / min, keep it warm for 10 hours, and leave the furnace for air cooling Water quenching after reaching 465°C. The results show that after the alloy is homogenized for 10 hours, there are no defects such as voids in the structure, the coarse intergranular eutectic in the original ingot basically dissolves into the matrix, and a small amount of intergranular phase remains.

[0041] After holding for 10 hours, the structure of water quenching after air cooling to 465°C is as follows: Figure 7 As shown, after the alloy is homogenized for 10 hours, there are no defects such as voids in the structure, and the original ingot structure ( Figure 6 ) The coarse intergranular eutectic basically dissolves into the matrix.

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Abstract

The invention discloses a high-temperature rapid homogenization treatment method for 7000 series aluminum alloys, belonging to the technical field of metal material heat treatment. The basic principle of the present invention is as follows: by selecting a suitable holding temperature (above Tm), the element diffusion process is accelerated, and the solubility of the intergranular phase is improved without obvious grain growth; by selecting a suitable holding time, it is ensured that both Effectively reduce the residual intergranular phase content and limit the thickness of the grain boundary oxide layer on the surface of the ingot; before the rapid cooling, the unsolidified intergranular liquid phase is solidified by slow cooling to prevent the formation of grain boundary holes; the final rapid cooling , to prevent the precipitation of coarse phase. The homogenization temperature of the present invention is high, the heat treatment time is short, and the heat treatment efficiency is high; the short homogenization time is conducive to reducing the thickness of the oxidized grain boundary on the surface of the ingot; cooling in stages (slow cooling added before fast cooling) can Eliminate the overburning limitation in solution treatment, and the treated ingot can be processed at a higher solution treatment temperature.

Description

Technical field: [0001] The invention belongs to the technical field of heat treatment of metal materials, and in particular provides a high-temperature rapid homogenization treatment method for 7000 series aluminum alloys. technical background: [0002] The 7000 series aluminum alloy is an ultra-high-strength aluminum alloy, which is mainly used in high-tech fields such as aerospace and rail transit, and has high requirements for the comprehensive performance of the product in terms of strength, toughness and corrosion resistance. At present, 7000 series aluminum alloys mainly produce the required profiles, plates or parts through extrusion, rolling, forging and other plastic forming processes, and then obtain the properties that meet the requirements of use through subsequent solid solution and aging treatments. [0003] The 7000-series aluminum alloy has a high element content, and alloy elements such as Zn, Mg, and Cu are easily enriched at the grain boundaries of the ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/053
Inventor 张志豪侯文荣季伟斌谢建新
Owner UNIV OF SCI & TECH BEIJING