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Aluminum alloy section and machining method for suppressing a coarse grain ring of aluminum alloy section

An aluminum alloy profile and processing method technology, applied in the field of aluminum alloy processing, can solve problems such as the decline of extrusion mechanical properties, the deterioration of the surface quality of the profile, and the inability to meet the requirements of aviation aluminum alloys, and achieve the effect of improving toughness.

Active Publication Date: 2019-01-04
SHANDONG NANSHAN ALUMINUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coarse crystal ring on the surface of the profile will not only reduce the quenching aging state of the extruded product, but also have an adverse effect on the mechanical properties and fatigue properties of the alloy
At present, the measures to eliminate or reduce the coarse-grained rings are mainly realized by optimizing the alloy composition, controlling the extrusion process and heat treatment process, but none of the existing measures can effectively reduce the depth of the coarse-grained rings, and also bring about extrusion mechanical properties. decline, the surface quality of profiles deteriorates, and a series of problems such as increased quenching sensitivity cannot meet the requirements of aluminum alloys for aviation

Method used

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  • Aluminum alloy section and machining method for suppressing a coarse grain ring of aluminum alloy section
  • Aluminum alloy section and machining method for suppressing a coarse grain ring of aluminum alloy section
  • Aluminum alloy section and machining method for suppressing a coarse grain ring of aluminum alloy section

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] This embodiment provides a kind of 2024 aluminum alloy profile, and it is to make according to following processing method:

[0060] According to the alloy element composition of 2024 aluminum alloy, the raw materials are prepared, melted and cast into cast rods. The alloy element composition includes: Si: 0.10%, Fe: 0.08%, Cu: 4.60%, Mn: 0.70%, Mg: 1.40%, Cr : 0.006%, Zn: 0.02%, Ti: 0.05%, Zr: 0.10%, others: single 0.030%, total 0.100%, Al: balance.

[0061] A two-stage homogenization system is used to perform the first homogenization treatment on the cast rod to obtain a homogeneous cast rod. The first-stage homogenization treatment is held at 420°C for 8 hours, and the second-stage homogenization treatment is at 490°C. Keep warm for 16h.

[0062] The primary homogeneous casting rod was subjected to a second homogenization treatment to obtain a secondary homogeneous casting rod. The second homogenization treatment was held at 496° C. for 24 hours, and the heating rat...

Embodiment 2

[0070]This embodiment provides a kind of 2024 aluminum alloy profile, and it is to make according to following processing method:

[0071] According to the alloy element composition of 2024 aluminum alloy, the raw materials are prepared, melted and cast into cast rods. The alloy element composition includes: Si: 0.12%, Fe: 0.10%, Cu: 4.70%, Mn: 0.60%, Mg: 1.60%, Cr : 0.01%, Zn: 0.08%, Ti: 0.03%, Zr: 0.06%, others: single 0.030%, total 0.100%, Al: balance.

[0072] Using the double-stage homogenization system, the cast rod is subjected to the first homogenization treatment to obtain a homogeneous cast rod. The first-stage homogenization treatment is held at 410°C for 8 hours, and the second-stage homogenization treatment is at 48°C. Under the condition of insulation for 18h.

[0073] The primary homogeneous cast rod is subjected to the second homogenization treatment to obtain the second homogeneous cast rod. The second homogenization treatment is to keep the temperature at 49...

Embodiment 3

[0081] This embodiment provides a kind of 2024 aluminum alloy profile, and it is to make according to following processing method:

[0082] According to the alloy element composition of 2024 aluminum alloy, the raw materials are prepared, melted and cast into cast rods. The alloy element composition includes: Si: 0.06%, Fe: 0.10%, Cu: 4.20%, Mn: 0.60%, Mg: 1.60%, Cr : 0.015%, Zn: 0.10%, Ti: 0.03%, Zr: 0.08%, others: single 0.030%, total 0.100%, Al: balance.

[0083] Using the double-stage homogenization system, the cast rod is subjected to the first homogenization treatment to obtain a homogeneous cast rod. The first-stage homogenization treatment is held at 420°C for 8 hours, and the second-stage homogenization treatment is at 480°C. Under the condition of insulation for 18h.

[0084] The primary homogeneous cast rod is subjected to the second homogenization treatment to obtain the second homogeneous cast rod. The second homogenization treatment is to keep the temperature at...

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Abstract

The invention provides an aluminum alloy section and a machining method for suppressing a coarse grain ring of the aluminum alloy section, and relates to the field of aluminum alloy machining. The machining method for suppressing the coarse grain ring of the aluminum alloy section comprises the following steps: preparing raw materials according to alloy elementary compositions of 2024 aluminum alloy, and smelting and casting into a cast stick; carrying out first-time homogenization treatment on the cast stick by a two-stage homogenization system to obtain a primary homogenized cast stick; carrying out second-time homogenization treatment on the primary homogenized cast stick to obtain secondary homogenized cast stick; carrying out peeling treatment and extrusion treatment on the secondaryhomogenized cast stick to obtain an extruded section; and carrying out pre-stretching, solid solution heat treatment, stretch flattening and natural aging on the extruded section to obtain a 2024 aluminum alloy section. By the processing method, the coarse grain ring of the coarse grain ring of the 2024 aluminum alloy extruded section can be suppressed effectively, and various performance indexesof a final product are higher than standard requirements. The strength and toughness of the prepared aluminum alloy section are greatly improved, and the requirement of aluminum alloy for aviation ismet.

Description

technical field [0001] The invention relates to the field of aluminum alloy processing, and in particular to a processing method for suppressing coarse crystal rings of aluminum alloy profiles and aluminum alloy profiles. Background technique [0002] 2024 aluminum alloy is mainly used in the fuselage, wing, shear ribs and webs of aircraft and aviation parts, as well as other structural parts that require high strength. The performance of 2024 aluminum alloy will have a huge impact on the structure and performance of the aircraft . The main alloy elements of 2024 aluminum alloy are Cu, Mg, Mn, the main impurity elements are Fe, Si, and the commonly used heat treatment states are T351, T4, T81. The tensile strength of 2024 aluminum alloy is 350-580MPa, and the plasticity is 12%. -20%, with high strength, plasticity, fracture toughness, fatigue life and fatigue crack growth resistance, etc., the heat resistance, corrosion resistance and yield strength of 2024 aluminum alloy c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C22C1/02C22C21/14C22C21/16C22C21/18C22F1/057B21C23/00B21C37/00
CPCB21C23/00B21C23/001B21C37/00C21D9/0075C22C1/026C22C21/14C22C21/16C22C21/18C22F1/002C22F1/057
Inventor 姜海涛高盼盼张启东杨亚平隋信增史春丽
Owner SHANDONG NANSHAN ALUMINUM
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