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Multi-source ultrasonic distribution control method for controlling segregation of compositions of 2219 aluminum alloy round ingot with one-meter-level diameter

A composition segregation and aluminum alloy technology, which is applied in the field of multi-source ultrasonic control to control the composition segregation of 1-meter-diameter 2219 aluminum alloy round ingots, can solve problems such as thick heart tissue, uneven heat transfer, and segregation, and achieve enhanced The effects of balanced regulation, solution to component segregation, and expansion of the scope of transmission

Active Publication Date: 2019-09-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its excellent performance, 2219 aluminum alloy is widely used in aerospace and other fields, but with the increase of diameter, especially when the diameter reaches more than 1m, there are serious inhomogeneity in the structure and composition of the ingot, and the eutectic phase is coarse and segregated. , the billet quality cannot meet the technical requirements
[0003] At present, vertical semi-continuous casting is generally used in the manufacture of high-strength aluminum alloy ingots. Semi-continuous casting has the advantages of high production efficiency and compact ingot structure. Slow, the distribution of melt temperature field and flow field is extremely uneven, and the final large-diameter semi-continuous casting high-strength aluminum alloy ingot has problems such as serious composition segregation, coarse and uneven structure, and enrichment and segregation of the core crystal phase.
For the problem of uneven heat transfer in small-scale semi-continuous casting, the optimization of casting process parameters, such as pouring temperature, pouring speed, cooling water flow, etc., can be used to improve the temperature distribution in the molten pool and the uniformity of the ingot structure. When it comes to large-diameter ingots, the adjustment of process parameters cannot change the problem of slow heat transfer in the center of the existing semi-continuous casting process, and thus cannot effectively improve the problems of large-diameter 2219 aluminum alloy round ingots with serious composition segregation, coarse core structure, and enrichment of crystalline phases , so new technologies and processes must be adopted

Method used

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  • Multi-source ultrasonic distribution control method for controlling segregation of compositions of 2219 aluminum alloy round ingot with one-meter-level diameter
  • Multi-source ultrasonic distribution control method for controlling segregation of compositions of 2219 aluminum alloy round ingot with one-meter-level diameter
  • Multi-source ultrasonic distribution control method for controlling segregation of compositions of 2219 aluminum alloy round ingot with one-meter-level diameter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Φ1250mm 2219 aluminum alloy round ingot casting, 4 sets of ultrasonic vibration system applied

[0060] 1. Casting process:

[0061] 1) Debugging and preparation before casting

[0062] Inspect 20 tons of casting equipment to ensure that the furnace part ensures that the heating device, electromagnetic stirring device, and tilting power device are normal; ②The launder and the online degassing and impurity removal part mainly check whether the heating device is normal, whether the rotating nozzle is normally available, and the filter plate is worn out. Whether it is serious, whether the thinner wire feeder is operating normally, and ensure that the launder is cleaned without aluminum slag, etc.; ③Crystal part: Whether the hot top cap and graphite mold are seriously worn out and need to be replaced, and whether the starter device is normal, and ensure oil-air lubrication The system and cooling water system are normal.

[0063] 2) Alloy ratio and melting

[0064] The smelting proc...

Embodiment 2

[0097] Φ1380mm 2219 aluminum alloy, specification: Φ1380×3600mm, 4 sets of ultrasonic vibration system are applied, ultrasonic vibration system is applied during the whole casting process (that is, the ultrasonic vibration system is applied when the ingot length is 200mm, and the ultrasonic vibration system is removed before the end of casting), The proportion of high-purity aluminum is used, and the other conditions are the same as those in Example 1. The on-site picture after ultrasonic application is as follows Figure 8 Shown.

[0098] The component testing refers to the standard GB / T 3190, and the components are shown in Table 3:

[0099] Table 3 Φ1380mm2219 alloy ingot composition

[0100]

[0101]

[0102] The typical position of the obtained ultrasonic ingot was inspected at low power, the result is as follows Picture 9 As shown, the detection board is equally divided into 5 areas along the radial direction, and each area takes 2 low-power images, see Picture 9 B in 1 -1~B ...

Embodiment 3

[0108] Φ1380mm 2219 aluminum alloy, specification: Φ1380×3600mm, 5 sets of ultrasonic vibration system are applied, the layout of the ultrasonic vibration system is as follows image 3 As shown in (a); ultrasound is applied throughout the casting process (that is, the ultrasonic vibration system is applied when the ingot length is 200mm, and the ultrasonic vibration system is removed before the end of the casting), high-purity aluminum ratio is used, other conditions and examples 1 Consistent, the scene picture after ultrasound application is as follows Picture 10 Shown.

[0109] The components are tested according to GB / T 3190, and the components are shown in Table 5:

[0110] Table 5 Φ1380mm2219 alloy ingot composition

[0111]

[0112]

[0113] The typical position of the obtained ultrasonic ingot was inspected at low power, the result is as follows Picture 11 As shown, Picture 11 E1~E5 in the middle represent 5 regions distributed equidistantly in the radial direction (each re...

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Abstract

The invention relates to the technical field of metal smelting, and provides a multi-source ultrasonic distribution control method for controlling the segregation of compositions of a 2219 aluminum alloy round ingot withthe one-meter-level diameter. According to the multi-source ultrasonic distribution control method, a multi-source ultrasonic vibration system is applied in a crystallizer to assist in melt solidification; when the diameter of the cast ingot is larger than or equal to 1m and less than 1.2m, 4 sets of ultrasonic vibration systems are applied; and when the diameter of the cast ingot is larger than or equal to 1.2m and less than or equal to 1.4m, 4, 5 or 7 sets of ultrasonic vibration systems are applied. When the multi-source ultrasonic distribution control method is used for casting the 2219 aluminum alloy round ingot with the large diameter specification, a plurality of ultrasonic vibration sources are used for assisting in solidification of the cast ingot in a molten pool in the crystallizer through joint efforts, ultrasonic waves are applied to the interior of the molten pool in full-area and wide-coverage modes, the propagation range of the ultrasonic waves can be expanded as far as possible, and the balanced regulation and control effect of an external ultrasonic energy field on a melt solidification process energy field system can be enhanced, so that the uniformity of tissues and the compositions is improved, and especially, the segregation of the compositions of the 2219 alloy is greatly alleviated.

Description

Technical field [0001] The invention relates to the technical field of metal smelting, in particular to a multi-source ultrasonic deployment control method for controlling the composition segregation of 2219 aluminum alloy ingots with a diameter of 1 meter. Background technique [0002] my country's aerospace industry is developing in the direction of integration and large-scale development, and the manufacturing of large-size aluminum alloy components has higher and higher quality requirements for large-size ingot billets. 2219 aluminum alloy is widely used in aerospace and other fields due to its excellent properties, but as the diameter increases, especially when the diameter reaches 1m or more, the structure and composition of the ingot are seriously uneven and the eutectic phase is coarse and segregated. , The quality of the billet cannot meet the technical requirements. [0003] At present, the manufacture of high-strength aluminum alloy ingots generally adopts vertical semi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/08C22C21/14C22C21/16C22C21/18
CPCB22D27/08C22C21/14C22C21/16C22C21/18
Inventor 李瑞卿李晓谦蒋日鹏张立华刘峙麟彭浩
Owner CENT SOUTH UNIV
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