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Vertical semi-continuous light alloy ingot casting process and apparatus with cooperation of power ultrasound wave and low frequency electromagnetic wave

A synergistic, light alloy technology, applied in the field of light alloy casting, can solve the problems of light alloy large-size ingot casting difficulties, difficulty in meeting deformation production, cracks and looseness, etc., achieve significant size effect of structure solidification, and improve internal metallurgy Quality and surface quality, effect of grain coarseness

Inactive Publication Date: 2007-08-22
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the difficulty in casting large-size ingots of light alloys, casting defects such as cracks and porosity are prone to occur. At the same time, due to problems such as composition segregation, coarse and uneven grain structure, the performance of the material is limited, and it is even difficult to meet the requirements of actual deformation production.

Method used

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  • Vertical semi-continuous light alloy ingot casting process and apparatus with cooperation of power ultrasound wave and low frequency electromagnetic wave
  • Vertical semi-continuous light alloy ingot casting process and apparatus with cooperation of power ultrasound wave and low frequency electromagnetic wave
  • Vertical semi-continuous light alloy ingot casting process and apparatus with cooperation of power ultrasound wave and low frequency electromagnetic wave

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1AZ31

[0024] Embodiment 1 AZ31 magnesium alloy Φ200mm billet vertical semi-continuous casting

[0025] AZ31 magnesium alloy is smelted according to the ratio, and 20ppmBe is added to achieve flame retardancy; the crystallizer is a hot-top metal mold inlaid with graphite rings and heat preservation caps; the melt is not treated with ultrasonic in the tundish, and power ultrasonic is applied in the crystallizer The synergy of the field and the low-frequency electromagnetic oscillating field.

[0026] The casting process conditions are: the casting speed is 100mm / min; the Φ20mm low carbon steel ultrasonic horn is preheated at 300°C for 1 hour; the ultrasonic frequency is 20kHz, and the ultrasonic intensity is about 6W / cm 2 ; The melt temperature in the tundish is 690°C; the AC frequency is 30Hz, the intensity is 4000AT; the DC intensity is 4000AT.

[0027] Fig. 4 is a comparison of microstructures of AZ31 magnesium alloy Φ200mm ingots obtained by traditional vertical semi-continuous c...

Embodiment 2

[0029] Example 2: Vertical semi-continuous casting of AZ80 magnesium alloy Φ300mm billet

[0030] AZ80 magnesium alloy is smelted according to the ratio, and 10ppmBe is added to achieve flame retardancy; the crystallizer is a hot-top metal mold inlaid with graphite rings and heat preservation caps; the melt is not treated with ultrasonic in the tundish, and power ultrasonic is applied in the crystallizer The synergy of the field and the low frequency electromagnetic field.

[0031] The casting process conditions are: the casting speed is 90mm / min; the Φ20mm low carbon steel ultrasonic horn is preheated at 300°C for 1 hour; the ultrasonic frequency is 20kHz, and the ultrasonic intensity is about 5W / cm 2 ; The melt temperature in the tundish is 670°C; the AC frequency is 30Hz, and the intensity is 6000AT.

[0032] Fig. 5 is a comparison of microstructures of AZ80 magnesium alloy Φ300mm ingots obtained by traditional semi-continuous casting, low-frequency electromagnetic vertica...

Embodiment 3

[0034] Example 3: Vertical semi-continuous casting of MA2-1 magnesium alloy Φ300mm billet

[0035] Smelt MA2-1 (Russian grade, equivalent to AZ41) magnesium alloy according to the ratio, and add 20ppm Be to achieve flame retardancy; the inner sleeve of the crystallizer is a hot-top metal mold inlaid with graphite rings and heat preservation caps; the melt is in the middle bag There is no ultrasonic pretreatment, and a synergistic field of power ultrasonic and low-frequency electromagnetic is applied in the crystallizer.

[0036] The casting process conditions are: the casting speed is 100mm / min; the Φ20mm low carbon steel ultrasonic horn is preheated at 300°C for 1 hour; the ultrasonic frequency is 20kHz, and the ultrasonic intensity is about 10W / cm 2 ; The melt temperature in the tundish is 680°C; the AC frequency is 25Hz, and the intensity is 6000AT.

[0037] Fig. 6 is a comparison of microstructures of MA2-1 magnesium alloy Φ300mm ingots obtained by traditional semi-contin...

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Abstract

The present invention is vertical semi-continuous light alloy casting process and apparatus with cooperation of power ultrasonic field and low frequency electromagnetic field. During casting, one low frequency electromagnetic field acting on the surface of metal molt and one power ultrasonic field acting on the crystallizer axis part are applied simultaneously. The present invention can reduce the transverse temperature gradient in casting blank solidification, alter liquid hole shape, raise the homogeneity of the casting blank and raise casting blank quality.

Description

technical field [0001] The invention belongs to the technical field of light alloy casting, and in particular relates to a method and equipment for vertical semi-continuous casting of large-size ingots of light alloys through the synergistic effect of two external fields, power ultrasonic and low-frequency electromagnetic. Background technique [0002] Applying an external field is a very effective method to change the solidification behavior of metals, such as applying electric fields, currents, magnetic fields (including permanent magnetic fields, electromagnetic fields, pulsed electromagnetic fields, combined electromagnetic fields, etc.), ultrasonic waves, mechanical waves, etc. during solidification, all of which have an effect on the alloy's stability during DC casting. Temperature field, flow field, concentration field, and solidification behavior such as nucleation and growth. Among them, applying an electromagnetic field is an efficient, economical and easy-to-imple...

Claims

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Application Information

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IPC IPC(8): B22D11/115B22D27/02
Inventor 乐启炽崔建忠张志强赵志浩
Owner NORTHEASTERN UNIV
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