Heat treatment method for preventing 2A12 aluminum alloy parts from solid solution overburning

A technology of aluminum alloy parts and heat treatment method, which is applied in the field of heat treatment of 2A12 aluminum alloy, can solve the problems of aluminum alloy overheating, parts scrapping, workpiece blistering, etc., and achieve the effects of increased tensile strength, low heat preservation temperature, and elimination of internal stress

Active Publication Date: 2018-12-18
西安长峰机电研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the beginning of heat preservation, there will be a short-term rise in furnace temperature, and the rise temperature is affected by many external factors, which is likely to cause overheating or even overburning of the 2A12 aluminum alloy, resulting in blistering, delamination, cracking, etc. of the workpiece, and in severe cases will lead to Whole furnace parts are scrapped

Method used

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  • Heat treatment method for preventing 2A12 aluminum alloy parts from solid solution overburning
  • Heat treatment method for preventing 2A12 aluminum alloy parts from solid solution overburning
  • Heat treatment method for preventing 2A12 aluminum alloy parts from solid solution overburning

Examples

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Effect test

Embodiment 1

[0030] A special-shaped porous 2A12 aluminum alloy workpiece (H112 state) with an outer diameter of 200mm and an effective thickness of 17mm was heated by a 60Kw aluminum alloy box-type resistance furnace. First, put the workpiece in the furnace at room temperature, and send power at full power to heat the workpiece to 480°C and keep it warm for 25min; Water cooled to room temperature, wherein the quenching transfer time is 7 seconds, and the water temperature is 25°C. Natural aging, the tensile strength of the final material is 500MPa, the elongation after fracture is 17%, there is no abnormality in the coloring flaw detection, the surface quality is good, the high-magnification structure is normal, and there is no overheating phenomenon.

Embodiment 2

[0032] A thin-walled 2A12 aluminum alloy workpiece (H112 state) with a cylindrical hollow structure with a large end diameter of 110mm, a small end diameter of 90mm, and an effective thickness of 2.5mm was heated by a 70Kw aluminum alloy vertical water quenching furnace. First, put the workpiece in the furnace at room temperature, and send power at full power to heat the workpiece to 470°C and keep it warm for 15 minutes; after the heat preservation is over, raise the temperature of the workpiece to 492°C at a heating rate of 0.7°C / min; keep the workpiece at 492°C for 60 minutes; after the heat preservation is over Water cooled to room temperature, where the quenching transfer time is 4 seconds, and the water temperature is 50°C. Natural aging, the tensile strength of the final material is 495MPa, the average elongation after fracture is 20%, there is no abnormality in the coloring flaw detection, the surface quality is good, the high-magnification structure is normal, and ther...

Embodiment 3

[0034] A lath-type 2A12 aluminum alloy workpiece (H112 state) with an effective thickness of 22mm is heated by a 70Kw aluminum alloy vertical water quenching furnace. First, put the workpiece in the furnace at room temperature, and send power at full power to heat the workpiece to 460°C and keep it warm for 35min; Water cooled to room temperature, wherein the quenching transfer time is 9 seconds, and the water temperature is 35°C. Natural aging, the tensile strength of the final material is 500MPa, the elongation after fracture is 18%, there is no abnormality in the coloring flaw detection, the surface quality is good, the high-magnification structure is normal, and there is no overheating phenomenon.

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Abstract

The invention provides a heat treatment method for preventing 2A12 aluminum alloy parts from solid solution overburning. The heat treatment method comprises the following steps of heating the 2A12 aluminum alloy parts to 440-480 DEG C, and keeping the temperature for 10-40 minutes; then heating to 485-495 DEG C at a heating rate of 0.4-1.2 DEG C per minute, and keeping the temperature for 60-120 minutes; and finally, using water to cool the aluminum alloy parts to room temperature, wherein transfer time of entering water is not more than 10 seconds and the water temperature is 20-60 DEG C. Theheat treatment method for preventing the 2A12 aluminum alloy parts from solid solution overburning has simple operation, not only can prevent the 2A12 aluminum alloy parts from solid solution overburning, but also can reduce energy consumption and improve the performance of 2A12 aluminum alloy products.

Description

technical field [0001] The invention relates to a heat treatment method for 2A12 aluminum alloy. Background technique [0002] 2A12 aluminum alloy belongs to the Al-Cu-Mg series hardenable aluminum alloy, which also has good formability and machinability, and is one of the most widely used aluminum alloys. In production, generally 2A12 workpieces are used under solid solution plus natural aging or solid solution plus artificial aging. [0003] The traditional 2A12 aluminum alloy solution quenching temperature is 498°C±5°C, and short-term high-temperature heating is often used to make the material fully solid-solution. Since the temperature of the soluble phase in the 2A12 alloy is fully solid solution and the ternary eutectic temperature of α (Al) + S (CuMgAl2) + θ (CuAl2) is very narrow (close to the solid solution limit line at the melting point), the solid solution temperature It is quite close to the overburning temperature of 504°C. Generally, a setting wave will appe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/057
CPCC22F1/002C22F1/057
Inventor 袁钰坤郑淑丽朱伟强李亚红张志正
Owner 西安长峰机电研究所
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