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

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...

Examples

Embodiment 1

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

Embodiment 2

[0056] The experimental material is a semi-continuously cast Al-Cu-Mg-Si-Mn alloy ingot, and its chemical composition is: Cu is 4.3wt.%~4.5wt.%, Mg is 0.65wt.%~0.75wt.%, Si 0.6wt.%~0.7wt.%, Mn 0.45wt.%~0.55wt.%, Fe 0.1wt.%~0.2wt.%, Ga<0.03wt.%, P<0.015wt.%, Ti <0.015wt.%, V<0.015wt.%, Zn<0.01wt.%, the total amount of impurities <0.01wt.%, and the balance is Al. The Al-Cu-Mg-Si-Mn alloy ingot was machined into a billet with a diameter of 200 mm, and the billet was subjected to secondary homogenization treatment. Put the billet into the furnace first, raise the temperature with the furnace to 480°C at a speed of 15°C / min, and hold the holding time for 8 hours. After the holding time is reached, the billet is cooled to 300°C with the furnace, and then taken out of the resistance furnace and air-cooled to room temperature; Raise the furnace temperature of the resistance furnace to 515°C at a speed of 15°C / min, put the homogenized billet into the furnace, keep the billet for 18 ho...

Embodiment 3

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

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...

Examples

Embodiment 1

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

Embodiment 2

[0056] The experimental material is a semi-continuously cast Al-Cu-Mg-Si-Mn alloy ingot, and its chemical composition is: Cu is 4.3wt.%~4.5wt.%, Mg is 0.65wt.%~0.75wt.%, Si 0.6wt.%~0.7wt.%, Mn 0.45wt.%~0.55wt.%, Fe 0.1wt.%~0.2wt.%, Ga<0.03wt.%, P<0.015wt.%, Ti <0.015wt.%, V<0.015wt.%, Zn<0.01wt.%, the total amount of impurities <0.01wt.%, and the balance is Al. The Al-Cu-Mg-Si-Mn alloy ingot was machined into a billet with a diameter of 200 mm, and the billet was subjected to secondary homogenization treatment. Put the billet into the furnace first, raise the temperature with the furnace to 480°C at a speed of 15°C / min, and hold the holding time for 8 hours. After the holding time is reached, the billet is cooled to 300°C with the furnace, and then taken out of the resistance furnace and air-cooled to room temperature; Raise the furnace temperature of the resistance furnace to 515°C at a speed of 15°C / min, put the homogenized billet into the furnace, keep the billet for 18 ho...

Embodiment 3

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

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