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Grain refinement method of 7000 series aluminum alloy

A treatment method and grain refinement technology, which is applied in the field of deformation heat treatment of metal materials and grain refinement of aluminum alloy materials, can solve the problems of long process cycle, non-continuous production, and large energy consumption, and achieve reduced operation Difficulty, time shortening, and the effect of increasing longitudinal elongation

Active Publication Date: 2014-02-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even J. Wert's ITMT (RI-ITMT) process also requires long-term high-temperature overaging treatment, which has a long process cycle, high energy consumption, and cannot be continuously produced. Therefore, it is necessary to develop a simple operation, short process cycle and It is of great significance to realize the new intermediate deformation heat treatment process of industrial production

Method used

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  • Grain refinement method of 7000 series aluminum alloy
  • Grain refinement method of 7000 series aluminum alloy
  • Grain refinement method of 7000 series aluminum alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0036] according to figure 1 The mechanical heat treatment process shown uses 7075 aluminum alloy as the rolling material. In order to dissolve the solute atoms into the matrix, the plate was subjected to solution treatment at 475 °C / 1.5 h, water quenched at room temperature, figure 2 It is the metallographic structure of the undeformed initially quenched 7075 alloy. Deformation was realized on an ordinary two-roll rolling mill. The 15 mm thick solid-solution 7075 alloy plate was heated to 350 °C and held for 10 min, and 60% of the deformation was achieved through 6 passes of rolling, in which every two passes were returned to the furnace for 5 minutes ( holding temperature of 350°C), and then continue rolling the plate with 60% deformation on the rolling mill. The rolled plate was subjected to solid solution recrystallization treatment at 480°C for 10 min and 30 min, respectively. Figure 3a and b show the metallographic structures of the two. Figure 3 c and d are the EBSD...

Embodiment 2

[0038] according to figure 1The mechanical heat treatment process shown uses the 7075 alloy that has been solution-treated at 475°C / 1.5h as the rolled material (thickness 15 mm). It was heated to 450°C and held for 10 min, and 50% deformation was achieved through 5 passes, and it was returned to the furnace for 5 min every two passes, and then continued to be continuously deformed on the rolling mill with deformations of 60% and 90%, respectively. Reheat. The final rolled sheet was subjected to 480°C / 0.5h solid solution recrystallization treatment, and Fig. 6a and b respectively show the fine-grained structures obtained by the two. The alloy with continuous deformation of 60% is subjected to 480°C / 0.5h solution treatment and T6 aging treatment. At this time, the longitudinal and transverse strength of the plate are equivalent to those in Example 1, and the longitudinal and transverse elongation of the plate are 17.5% and 18.2%, respectively. This condition can be seen It als...

Embodiment 3

[0040] according to figure 1 The mechanical heat treatment process shown uses the 7075 alloy that has been solution-treated at 475°C / 1.5h as the rolled material (thickness 15 mm). It was heated to 350°C and held for 10 minutes, and 90% of the deformation was achieved through 8 passes. Every two passes were returned to the furnace for 5 minutes, and then the continuous deformation of 70% of the deformation was continued on the rolling mill without returning to the furnace. The final rolled plate is treated at 480°C / 0.5h and 120°C / 24h to obtain a fine-grained structure such as Figure 7 As shown, the longitudinal and transverse strength of the plate at this time are equivalent to those in Example 1, and the longitudinal and transverse elongation of the plate are 17.4% and 16.8% respectively. It can be seen that this condition also improves the strength and plastic anisotropy of the plate (Table 1) .

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Abstract

The invention relates to a grain refinement method of 7000 series aluminum alloy. The grain refinement method of the 7000 series aluminum alloy comprises the following specific steps: (1) solid solution treatment; (2) rolling deformation; (3) continuous rolling deformation; (4) short-time solid solution recrystallization. According to the grain refinement method, the grain size of aluminum alloy can be refined from more than 200 microns to 10 microns and even below; after a proper aging treatment to a fine grain structure, transverse and longitudinal strengths of an aluminum alloy plate at room temperature are equivalent with those of a plate obtained according to the conventional hot rolling process, while the break elongation is greatly improved; the grain refinement method is simple in process, short in cycle and low in energy consumption, and has great application potential and value in industrial production.

Description

[0001] technical field [0002] The invention relates to a deformation heat treatment method for improving the strength and plastic anisotropy of high-strength aluminum alloys, in particular to a grain refinement treatment method for aluminum alloy materials, which belongs to the technical field of deformation heat treatment processes for metal materials. Background technique [0003] According to the Hall–Petch relationship, the strength of the material increases as the grain size decreases, and the plasticity and toughness of fine-grained materials also increase to varying degrees. Therefore, refining grains becomes a method to improve the overall performance of aluminum alloys. Although recrystallization is difficult for aluminum alloys, grain refinement can be achieved through discontinuous recrystallization. [0004] Intermediate deformation heat treatment (ITMT) has been favored in refining the grains of aluminum alloys. The earliest relatively mature ITMT process was...

Claims

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Application Information

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IPC IPC(8): C22F1/04
Inventor 张济山霍望图侯陇刚崔华郭明星庄林忠
Owner UNIV OF SCI & TECH BEIJING
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