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Hot rolling method for refining 7000 series aluminum alloy thick plate grains

A technology of aluminum alloy and thick plate, applied in the field of aluminum alloy hot rolling, can solve the problems of poor formability, poor corrosion resistance, poor natural aging stability, etc., and achieve the effect of refining and improving comprehensive mechanical properties

Active Publication Date: 2021-12-10
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the research on 7000 series aluminum alloys is mainly concentrated on the medium and thick plates used in aviation, and the research fields mainly focus on the optimization of alloy composition, the development of heat treatment system and thermomechanical processing, etc., while the research on automotive structural parts (safety parts) Due to the unsystematic research, it is restricted by poor formability, poor natural aging stability and poor corrosion resistance.

Method used

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  • Hot rolling method for refining 7000 series aluminum alloy thick plate grains
  • Hot rolling method for refining 7000 series aluminum alloy thick plate grains
  • Hot rolling method for refining 7000 series aluminum alloy thick plate grains

Examples

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Effect test

Embodiment 1

[0035] A hot rolling method for refining grains of 7000 series aluminum alloy thick plates, comprising the following steps:

[0036] Step 1: smelting 7075 aluminum alloy, and undergoing two-stage homogenization treatment of 460°C for 8 hours and 480°C for 6 hours;

[0037] Step 2: Heat the 7075 aluminum alloy casting slab obtained in step 1 to 470°C in a heating furnace and keep it warm for 90 minutes, and then roll it after it comes out of the furnace. The rough rolling temperature is controlled in the temperature range of 420°C-460°C, and the total reduction is greater than 70%. , The reduction rate of the 5 passes is 58%, 54%, 51%, 42% and 35%, respectively, and the final hot rolling finish rolling treatment is carried out.

[0038] Figure 4 It is the metallographic structure diagram after hot rolling, which is represented by Figure 4 It can be seen that the structure after rolling in the present invention is basically recrystallized grains, and the average grain size r...

Embodiment 2

[0041] A hot rolling method for refining grains of 7000 series aluminum alloy thick plates, comprising the following steps:

[0042] Step 1: smelting 7050 aluminum alloy, and undergoing two-stage homogenization treatment of 10 hours at 440°C and 8 hours at 470°C;

[0043] Step 2: Heat the 7050 aluminum alloy cast slab obtained in step 1 to 460°C for 120 minutes in a heating furnace, and roll it after coming out of the furnace. The rough rolling temperature is controlled in the temperature range of 400°C-440°C, and the total reduction is greater than 70%. , The reduction rates of the 5 passes were 56%, 52%, 50%, 41% and 32%, respectively, and finally hot rolling and finishing treatment were carried out.

[0044] Figure 5 It is the metallographic structure diagram after hot rolling, which is represented by Figure 5 It can be seen that the structure after rolling in the present invention is basically recrystallized grains, and the average grain size reaches 56 μm.

[0045] T...

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Abstract

The invention discloses a hot rolling method for refining 7000 series aluminum alloy thick plate grains, and relates to the technical field of aluminum alloy rolling and heat treatment. The rolling and heat treatment method comprises the following steps that two-stage homogenizing annealing treatment of 400-450 DEG C and 460-500 DEG C is carried out on a 7000 series aluminum alloy casting blank, a large-size crystal phase in a solidification process is reduced, the occurrence state of alloy elements is changed; rough rolling and finish rolling are conducted after heating, the reduction rate of 70% or above is achieved in the rough rolling process, the pass reduction rate is decreased progressively by 5-9 passes, and the reduction rate of at least the first three passes is larger than 50%. According to the hot rolling method, the grains of the aluminum alloy thick plate subjected to traditional rolling treatment are refined, and the hot rolling grains of the 7000 series aluminum alloy thick plate can be refined from 80 microns or above to 60 microns or below by adopting the hot rolling treatment method.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy hot rolling, and in particular relates to a hot rolling method for refining grains of 7000 series aluminum alloy thick plates. Background technique [0002] At present, high-strength steel, composite materials, and aluminum alloys are the main materials for realizing lightweight vehicles. Among them, due to the advantages of low density, good corrosion resistance, easy machining, excellent surface quality and easy recycling, aluminum alloy is considered to be the most promising lightweight material for automobiles. [0003] At present, the aluminum alloys used in automobiles are mainly 5000 series and 6000 series aluminum alloys. Although the formability of the two is good, their strength is low. With the further development of automobile lightweight, the 7000 series aluminum alloy with light weight and high strength has gradually become a research and development hotspot. The 7000 series...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/48B21B37/74B21B1/38B23P15/00C22F1/04
CPCB21B37/74B21B37/48B21B1/38C22F1/04B23P15/00
Inventor 李辉冯锐潘尧坤王家毅崔晓丽王永晓崔红卫
Owner SHANDONG UNIV OF TECH
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