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Magnesium alloy ingot and preparation method thereof

A magnesium alloy and ingot casting technology, which is applied in the field of metal materials and metallurgy, can solve the problems of coarse grains and segregation of magnesium alloys, and achieve the effects of sufficient refining, uniform dispersion and reduced input.

Active Publication Date: 2021-03-12
CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention aims to provide a casting preparation method for high-ductility medium-strength magnesium alloys, which uses an improved semi-continuous casting process to solve the problems of coarse grains, segregation, and cold shock that are prone to occur in magnesium alloys during the casting process. and other defects, in order to suppress macro segregation, improve ingot quality and yield, and provide guarantee for subsequent deformation processing

Method used

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  • Magnesium alloy ingot and preparation method thereof
  • Magnesium alloy ingot and preparation method thereof
  • Magnesium alloy ingot and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1 Optical microstructure diagram of the ingot was measured by a gold phase microscope.

[0053] Example 1:

[0054] According to the ingredient content Al: 4.3%, Zn: 2.8%, Mn: 0.2%, GD: 0.53%, Y: 0.02%, CA: 0.036%, and the ingredient required for Mg is Mg, and the high-pure magnesium ingot is sequentially added to the melting furnace. High pure aluminum ingot, high pure zinc ingot, Al-Mn intermediate alloy, Mg-RE intermediate alloy, Mg-CA intermediate alloy. After the raw material is completely melted, the melt temperature is adjusted to 700 ° C, the mechanical stirring refining time is 60 min, the mechanical stirring speed is 120 r / min, then the melt is warmed to 730 ° C for 30 min, the gas is stirred and refining time is 60 min, gas flow 20L / h, gas After the refining, the melt was allowed to reduce the temperature to 620 ° C, heat insulation for 4 h, then warmed to 670 ° C, prepared semi-continuous casting. The semi-contiguous casting rindle speed is 60mm / mi...

Embodiment 2

[0056] According to the ingredient content Al: 3.5%, Zn: 3.5%, Mn: 0.4%, GD: 0.12%, Y: 0.20%, CA: 0.051%, the balance of Mg, and the high-pure magnesium ingot is sequentially added to the melting furnace. High pure aluminum ingot, high pure zinc ingot, Al-Mn intermediate alloy, Mg-RE intermediate alloy, Mg-CA intermediate alloy. After the raw material is completely melted, the melt temperature is adjusted to 712 ° C, the mechanical stirring refining time is 40 min, the mechanical stirring speed is 150 r / min, then the melt is warmed to 730 ° C for 30 min, the gas is stirred and refining time 35min, gas flow 30L / h, gas After refining, the melt was allowed to cool down to 640 ° C, heat preservation of 3 h, then warmed to 700 ° C, prepared semi-continuous casting. The semi-contiguous casting speed is 50 mm / min, the cooling water flow rate is 80L / min, the magnesium alloy cast rod of φ355mm is cast, the surface of the ingot is high, no crack and obvious cold space, such as figur...

Embodiment 3

[0058] According to the ingredient content Al: 5%, Zn: 2.8%, Mn: 0.3%, GD: 0.13%, CA: 0.023%, the ingredient required for Mg, and the melt furnace is sequentially added to the melting furnace, high pure aluminum ingot. High pure zinc ingot, Al-Mn intermediate alloy, Mg-RE intermediate alloy, Mg-CA intermediate alloy. After the raw material is completely melted, the melt temperature is adjusted to 710 ° C, the mechanical stirring refining time is 50 min, the mechanical stirring speed is 120 r / min, then the melt is warmed to 740 ° C for 30 min, the gas is stirred 50 min, the gas is stirred from 50 min, and the gas flow is 30 L / h, gas After refining, the melt was allowed to rely until 630 ° C, heat preservation of 4 h, then warmed to 690 ° C, prepared semi-continuous casting. The semi-continuous casting pull-up speed is 80mm / min, the cooling water flow is 65L / min, and the magnesium alloy cast rod of φ170mm is cast, the surface of the ingot is high, no crack and obvious cold s...

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Abstract

The invention aims at providing a magnesium alloy ingot and a preparation method thereof. Alloy is prepared from the following components in percentage by mass: 3.5-5.0 percent of Al, 2.0-3.5 percentof Zn, 0.1-0.8 percent of Mn, 0.01-0.80 percent of RE, 0.001-0.090 percent of Ca, smaller than or equal to 0.005 percent of Fe, smaller than or equal to 0.05 percent of Si, smaller than or equal to 0.005 percent of Cu, smaller than or equal to 0.005 percent of Ni, smaller than or equal to 0.1 percent of total content of impurities and the balance of Mg, wherein a sum of contents of the Al and theZn is that Al+Zn is more than or equal to 6 percent and less than or equal to 8 percent. For the magnesium alloy ingot and the preparation method thereof, with combination of mechanical stirring refining and gas stirring refining, through low-temperature standing, the cleanliness of a melt and the distribution uniformity of alloy elements in the melt are remarkably improved, and finally, a novel high-ductility medium-strength magnesium alloy cast rod which is uniform in structure, fine in grain, few in internal defects and high in surface quality is prepared.

Description

Technical field [0001] The present invention belongs to the field of metallic materials and metallurgical technology, and in particular to a novel high-profile semi-continuous casting method, and a ingot prepared from the method. Background technique [0002] Magnesium alloy is the lightest metal structural material in practical applications, which is only 2 / 3 of the aluminum alloy, and the steel is 1 / 4, and the magnesium alloy has a high degree of strength than the strength, good thermal conductivity, electromagnetic shield and damping. Good performance, good cutting performance. Therefore, magnesium alloy is an ideal lightweight structure material that has a very broad application market in the fields of aerospace, automobile, orbit transportation, 3C. [0003] Absolute low intensity pure magnesium, usually employed method of alloying, adding Al, Zn, Ca, Mn, or rare earth elements such alloying elements to pure magnesium to increase the strength of pure magnesium, as pure magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02B22D11/00B22D11/114B22D11/117C22C1/02
CPCC22C23/02C22C1/02B22D11/001B22D11/117B22D11/114
Inventor 康心锴刘宝龙曾钢肖宏超黄硕
Owner CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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