Electromagnetic semi-continuous casting method for preparing high-strength heat-resistant rare-earth magnesium alloy ingot blank

A rare earth magnesium and alloy ingot technology, applied in the field of light alloy casting, can solve the problem of high-quality ingots being difficult, and achieve the effects of improving internal metallurgical quality and surface quality, inhibiting macrosegregation, and changing the shape of liquid pockets

Active Publication Date: 2014-06-11
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for Mg-Gd-Y-Zn or Mg-Y-Zn alloys with high rare earth content, the traditional DC (Direct Chilling) casting method is used to produce crack-free, smooth surface, fine and uniform structure, and no obvious High-quality ingots with solute segregation are very difficult

Method used

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  • Electromagnetic semi-continuous casting method for preparing high-strength heat-resistant rare-earth magnesium alloy ingot blank
  • Electromagnetic semi-continuous casting method for preparing high-strength heat-resistant rare-earth magnesium alloy ingot blank

Examples

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Effect test

Embodiment 1

[0026] Vertical Semi-continuous Casting of Mg-Gd-Y-Zn-Zr Magnesium Alloy φ200mm Ingot

[0027] The technical solution of the present invention will be described in detail below by taking the vertical semi-continuous casting of a φ200 mm ingot of Mg-Gd-Y-Zn-Zr magnesium alloy as an example.

[0028] 1) Mg-9Gd-3Y-1.5Zn-0.6Zr magnesium alloy is smelted according to the ratio, and the materials are pure Mg ingot, Mg-25%Gd master alloy, Mg-25%Y master alloy, pure Zn ingot and Mg-30% Zr master alloy;

[0029] 2) Melting the proportioned materials: A. Preheat the crucible to dark red 400~500°C, sprinkle appropriate flux on the crucible wall and bottom, add the preheated Mg ingot, heat up and melt, and then put it on the furnace charge Sprinkle flux on top; B. Add Zn ingot when the molten magnesium temperature rises to 720°C, and stir for 8 minutes after it is completely melted; C. Add Mg-Gd master alloy in batches when the temperature rises to 755~765°C, while adding Stir while sti...

Embodiment 2

[0035] Vertical Semi-continuous Casting of Mg-Gd-Y-Zn-Zr Magnesium Alloy φ280mm Ingot

[0036] The technical solution of the present invention will be described in detail below by taking the vertical semi-continuous casting of a φ280 mm ingot of Mg-Gd-Y-Zn-Zr magnesium alloy as an example.

[0037] The Mg-12Gd-5Y-2Zn-0.5Zr magnesium alloy is smelted according to the ratio; the crystallizer is a hot-top metal mold inlaid with graphite rings and heat preservation caps; the melt is applied with a low-frequency electromagnetic field in the crystallizer.

[0038] The casting process conditions are: casting speed 50mm / min; casting temperature 740°C; cooling water intensity 140L / min; magnetic field AC frequency 15Hz, intensity 9000AT.

[0039] Tests show that under the above casting speed and casting temperature, the liquid cavity depths of the two casting methods are significantly different, the traditional semi-continuous casting is about 158mm, and the low-frequency electromagneti...

Embodiment 3

[0041] Vertical semi-continuous casting of Mg-Y-Zn-Zr magnesium alloy φ130mm billet

[0042] The technical solution of the present invention will be described in detail below by taking the vertical semi-continuous casting of a φ130 mm billet of Mg-11Y-7Zn-0.5Zr magnesium alloy as an example.

[0043] The Mg-11Y-7Zn-0.5Zr magnesium alloy is smelted according to the ratio; the crystallizer is a hot-top metal mold inlaid with graphite rings and heat preservation caps; the melt is applied with a low-frequency electromagnetic oscillation field in the crystallizer.

[0044] The casting process conditions are: casting speed 90mm / min; casting temperature 740°C; AC frequency 30Hz, intensity 4000AT; DC intensity 4000AT.

[0045] Tests show that under the above casting speed and casting temperature, the liquid cavity depths of the two casting methods are significantly different, the traditional semi-continuous casting is about 75mm, and the low-frequency electromagnetic casting method of...

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Abstract

The invention discloses an electromagnetic semi-continuous casting method for preparing a high-strength heat-resistant rare-earth magnesium alloy ingot blank. The method is characterized by comprising the following steps: batching, smelting and casting molding, namely by adopting a mold provided with an excitation coil, allowing melt to flow into the mold, and applying a low-frequency electromagnetic field of specified frequency and strength; starting a casting machine and performing throwing casting when the metal liquid level in the mold reaches the liquid level height which is 30-40mm away from the horizontal position on the top of the mold, wherein the casting speed is 50-90mm / min, the casting temperature is 740-750DEG C; and the applied low-frequency electromagnetic frequency ranges from 1 to 90Hz, and the strength is 2000-4000AT. According to the method, the transverse temperature gradient in the process of solidifying the casting blank can be greatly reduced, the liquid pool shape is changed, the solidification uniformity of the casting blank is improved, the size effect of the casting blank casting defects is reduced, the internal metallurgical quality and surface quality of a large vertical semi-continuous casting rare-earth magnesium alloy ingot blank are improved, and a high-quality rare-earth magnesium alloy ingot blank which does not have cracks and is even and smooth in surface, stable in components, obviously low in macrosegregation and fine and uniform in texture can be obtained.

Description

technical field [0001] The invention belongs to the technical field of light alloy casting, and relates to a method for preparing a high-strength heat-resistant rare earth magnesium alloy ingot electromagnetic semi-continuous casting, in particular to Mg-Gd-Y-Zn series and Mg-Y-Zn series high-strength heat-resistant rare earth magnesium A method for preparing an alloy electromagnetic semi-continuous casting billet. Background technique [0002] Magnesium rare earth alloys have good room temperature, high temperature mechanical properties and corrosion resistance, and are a class of magnesium alloys with very good application prospects. Rare earth elements are the most critical elements to improve the room temperature and high temperature strength and creep resistance of magnesium alloys. Among them, Gd and Y are excellent additives to improve the mechanical properties of magnesium alloys. Gd and Y have higher melting points, and their atomic radii are close to those of mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/02B22D11/049
Inventor 朱秀荣邵志文徐永东王军王荣聂景江陈大辉
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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