Homogenizing heat treatment technology for eliminating Al-Cu-Mg-Si-Mn alloy casting crystal phase

A technology of homogenization heat treatment and alloy casting, which is applied in the field of aluminum alloy heat treatment, can solve the problems of incomplete homogenization of eutectic phase and high melting point second phase particles, achieve optimized homogenization effect, increase solid solution amount, and homogenize degree of effect

Active Publication Date: 2017-02-15
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to realize a kind of homogenization heat treatment process that eliminates Al-Cu-Mg-Si-Mn alloy casting crystal phase, solve the Al-Cu-Mg alloy casting process

Method used

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  • Homogenizing heat treatment technology for eliminating Al-Cu-Mg-Si-Mn alloy casting crystal phase
  • Homogenizing heat treatment technology for eliminating Al-Cu-Mg-Si-Mn alloy casting crystal phase
  • Homogenizing heat treatment technology for eliminating Al-Cu-Mg-Si-Mn alloy casting crystal phase

Examples

Experimental program
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Example Embodiment

[0052] Example 1

[0053] The experimental material is a semi-continuously cast Al-Cu-Mg-Si-Mn alloy ingot, its chemical composition is: Cu is 4.3wt.%~4.5wt.%, Mg is 0.65wt.%~0.75wt.%, Si It is 0.6wt.%~0.7wt.%, Mn is 0.45wt.%~0.55wt.%, Fe is 0.1wt.%~0.2wt.%, Ga<0.03wt.%, P<0.015wt.%, Ti <0.015wt.%, V<0.015wt.%, Zn<0.01wt.%, total impurity<0.01wt.%, and the balance is Al. The Al-Cu-Mg-Si-Mn alloy ingot is machined into a billet with a diameter of 200 mm for secondary homogenization. First put the billet into the furnace, and heat up with the furnace to 480°C at a rate of 15°C / min. According to the relationship between the diameter of the blank and the holding time, the holding time is determined to be 12 hours. After the holding time is reached, the furnace is cooled to 300°C, quickly taken out of the furnace and air-cooled to room temperature; then the furnace temperature is raised to 515 at a rate of 15°C / min ℃, put the once homogenized billet into the furnace. After the bill...

Example Embodiment

[0055] Example 2

[0056] The experimental material is a semi-continuously cast Al-Cu-Mg-Si-Mn alloy ingot, its chemical composition is: Cu is 4.3wt.%~4.5wt.%, Mg is 0.65wt.%~0.75wt.%, Si It is 0.6wt.%~0.7wt.%, Mn is 0.45wt.%~0.55wt.%, Fe is 0.1wt.%~0.2wt.%, Ga<0.03wt.%, P<0.015wt.%, Ti <0.015wt.%, V<0.015wt.%, Zn<0.01wt.%, total impurity<0.01wt.%, and the balance is Al. The Al-Cu-Mg-Si-Mn alloy ingot is machined into a billet with a diameter of 200 mm, and the billet is subjected to secondary homogenization treatment. First put the billet into the furnace and heat it up to 480°C with the furnace at a rate of 15°C / min. The holding time is 8 hours. After the holding time is reached, the billet is cooled with the furnace to 300°C, and taken out of the resistance furnace to air-cool to room temperature; Raise the furnace temperature of the resistance furnace to 515°C at a rate of 15°C / min, put the once homogenized blank into the furnace, and after the blank is kept warm for 18 hou...

Example Embodiment

[0058] Example 3

[0059] The experimental material is a semi-continuously cast Al-Cu-Mg-Si-Mn alloy ingot, its chemical composition is: Cu is 4.3wt.%~4.5wt.%, Mg is 0.65wt.%~0.75wt.%, Si It is 0.6wt.%~0.7wt.%, Mn is 0.45wt.%~0.55wt.%, Fe is 0.1wt.%~0.2wt.%, Ga<0.03wt.%, P<0.015wt.%, Ti <0.015wt.%, V<0.015wt.%, Zn<0.01wt.%, total impurity<0.01wt.%, and the balance is Al. The Al-Cu-Mg-Si-Mn alloy ingot is machined into a billet with a diameter of 200 mm, and the billet is subjected to secondary homogenization treatment. First put the billet into the furnace, and heat it up to 480°C with the furnace at a rate of 20°C / min. The holding time is 10 hours. After the holding time is reached, the billet is cooled to 300°C with the furnace and taken out of the resistance furnace to air-cool to room temperature; Raise the furnace temperature of the resistance furnace to 520°C at a rate of 15°C / min, put the once homogenized billet into the furnace. After the billet is kept warm for 18 hour...

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Abstract

The invention provides a homogenizing heat treatment technology for eliminating the Al-Cu-Mg-Si-Mn alloy casting crystal phase. The homogenization technology comprises the steps that an Al-Cu-Mg-Si-Mn alloy ingot is placed into a furnace, is heated to 470-480 DEG C at the speed of 15-20 DEG C/min, is subjected to heat preservation for 8-12h, then is subjected to furnace cooling to 250-300 DEG C, and is subjected to air cooling to the room temperature; then the ingot is placed into a heat preservation furnace with the temperature being 510-520 DEG C and subjected to heat preservation for 18-24h; and finally, the ingot is subjected to air cooling to the room temperature. According to the homogenizing heat treatment technology, the homogenization problem that Al-Cu-Mg series alloy ingots containing a high amount of Si, Fe and Mn are high in melting point, so that a complex second phase is difficult to eliminate is solved, the technology is simple and convenient to operate, the feasible homogenizing heat treatment scheme is provided for the various Al-Cu-Mg series alloy ingots containing a high amount of Si, Fe and Mn, and industrial production is facilitated.

Description

technical field [0001] The invention relates to a new homogeneous heat treatment process suitable for Al-Cu-Mg-Si-Mn alloys. The uniform structure obtained by the process can improve the post-processing performance of the alloy and the strengthening effect of heat treatment; it belongs to the technical field of aluminum alloy heat treatment. Background technique [0002] Aluminum alloys have been widely used as structural materials in the aerospace and automotive industries because of their low density, high specific strength, high stiffness, high corrosion resistance, and heat treatment strengthening. In modern aircraft structures, such as the fuselage frame, hatch frame, window frame, various joints, and aircraft landing gear hubs, aluminum alloy processing components are generally used. The performance of aluminum alloys plays an important role in the development of the aerospace industry. played a vital role. [0003] Al-Cu-Mg-Si-Mn alloy belongs to heat-treatable and s...

Claims

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Application Information

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IPC IPC(8): C22F1/057C22C21/16C22C21/18
CPCC22C21/14C22C21/16C22C21/18C22F1/057
Inventor 李慧中郭亮梁霄鹏朱泽晓李鹏伟
Owner CENT SOUTH UNIV
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