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Homogenization thermal-treatment method for ultra-large semi-continuous cast round ingot

A homogeneous heat treatment and super-large size technology, which is applied in the field of aluminum alloy processing, can solve the problems of inability to fully eliminate dendrite structure and low melting point eutectic structure, uneven forging structure, forging billet cracking, etc., and achieve the elimination of low melting point eutectic structure organization, elimination of dendrite organization, and the effect of ensuring comprehensive performance

Active Publication Date: 2015-07-29
广西南南铝加工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The 2219 aluminum alloy round ingot adopts semi-continuous casting production process. Due to the high pouring speed and cooling rate, the ingot is prone to dendrite segregation, casting stress, and a large number of non-equilibrium eutectic structures distributed along the grain boundaries, which seriously affect the ingot quality. Plastic processing performance and final product performance
[0005] The existing homogenization heat treatment technology does not have a process for super-large-sized, high-alloyed round ingots, which cannot fully eliminate dendritic structures and low-melting eutectic structures, resulting in cracking of the forging billet and uneven forging structures in the subsequent forging process; at the same time, it is impossible to Make zirconium, manganese, vanadium and other elements uniformly dispersed, and the performance indicators of the final product such as strength, elongation, and fracture toughness are low, and it is difficult to meet the application requirements

Method used

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  • Homogenization thermal-treatment method for ultra-large semi-continuous cast round ingot
  • Homogenization thermal-treatment method for ultra-large semi-continuous cast round ingot
  • Homogenization thermal-treatment method for ultra-large semi-continuous cast round ingot

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Effect test

Embodiment 1

[0047] In this embodiment, the homogenization heat treatment of the 2219 round ingot with a diameter of Φ1320 mm is achieved by the following scheme:

[0048] (1) Put the round ingot sample into the heating device and raise the temperature to 180°C with a heating rate of 14°C / h;

[0049] (2) Raise the temperature of the round ingot from 180°C to 520°C at a heating rate of 60°C / h, and keep it at 520°C for 80 hours;

[0050] (3) Cooling the temperature of the round ingot from 520°C to 360°C at a cooling rate of 58°C / h;

[0051] (4) The temperature of the round ingot is lowered from 360°C to 130°C at a cooling rate of 200°C / h.

[0052] (5) The round ingot was taken out from the heating apparatus, and it was air-cooled from 130° C. to room temperature.

Embodiment 2

[0054] In this embodiment, the homogenization heat treatment of the 2219 round ingot with a diameter of Φ1320 mm and a super large diameter is realized by the following scheme:

[0055] (1) Put the round ingot sample into the heating device to raise the temperature to 180°C, and the heating rate is 10°C / h;

[0056] (2) Heat the round ingot from 180°C to 535°C at a heating rate of 90°C / h, and keep it at 535°C for 30 hours;

[0057] (3) Cool the round ingot from 535°C to 360°C at a cooling rate of 50°C / h;

[0058] (4) Cool the round ingot from 360°C to 130°C at a cooling rate of 80°C / h.

[0059] (5) The round ingot was taken out from the heating apparatus, and it was air-cooled from 130° C. to room temperature.

Embodiment 3

[0061] In this embodiment, the homogenization heat treatment of the 2219 round ingot with a diameter of Φ1320 mm and a super large diameter is realized by the following scheme:

[0062] (1) Put the round ingot sample into the heating device to raise the temperature to 180°C, and the heating rate is 14°C / h;

[0063] (2) First, raise the temperature of the round ingot from 180°C to 300°C at a heating rate of 60°C / h, and keep it at 300°C for 30 hours; then raise the temperature of the round ingot from 300°C to 520°C at a heating rate of 60°C / h , kept at 520°C for 65h.

[0064] (3) Cool the round ingot from 520°C to 360°C at a cooling rate of 48°C / h;

[0065] (4) Cool the round ingot from 360°C to 130°C at a cooling rate of 120°C / h.

[0066] (5) The round ingot was taken out from the heating apparatus, and it was air-cooled from 130° C. to room temperature.

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Abstract

The invention discloses a homogenization thermal-treatment method for an ultra-large semi-continuous cast round ingot and relates to the technical field of aluminum alloy processing. The method comprises the following concrete steps: (1) heating the round ingot to the temperature of 180 DEG C at a temperature rising speed below 15 DEG C / h; (2) heating the round ingot to the temperature of 520 to 535 DEG C from the temperature of 180 DEG C at a temperature rising speed of 60-90 DEG C / h, and keeping the temperature for 30h to 80h at the temperature of 520 to 535 DEG C; (3) cooling the round ingot to the temperature of 360 DEG C from the temperature of 520 t0 535 DEG C at a temperature descending speed below 60DEG C / h; (4) cooling the round ingot to the temperature of 130 DEG C from the temperature of 360 DEG C at a temperature descending speed of 80 to 200 DEG C / h; (5) cooling the round ingot to room temperature from the temperature of 130 DEG C. According to the characteristics of the ultra-large semi-continuous cast round ingot, the method disclosed by the invention can be used for fully eliminating dendritic structures and low-melting-point eutectic structures, also enabling the elements such as zirconium, manganese and vanadium to be dispersed and distributed uniformly and guaranteeing the deformation processing structures in the later period and the final comprehensive performances of products.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy processing, in particular to a method for homogenizing heat treatment of a super-sized semi-continuous casting round ingot. Background technique [0002] Due to its high-temperature and low-temperature mechanical properties, high fracture toughness, stress corrosion resistance, processing performance, and good welding performance, 2219 aluminum alloy is a typical heat-treatable forged aluminum alloy. Products are used in aviation, aerospace and other fields in different forms and heat treatment states, especially their forgings can be used as materials for rocket storage tanks. With the continuous improvement of rocket thrust requirements and the increase of rocket diameter, there are higher requirements for the diameter, composition, structure and performance uniformity of 2219 forged billets. [0003] The 2219 aluminum alloy round ingot adopts semi-continuous casting production process. ...

Claims

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Application Information

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IPC IPC(8): C22F1/057
CPCC22F1/057
Inventor 乐永康姚祥何克准蓝东华唐露华
Owner 广西南南铝加工有限公司
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