Semi-continuous casting process of large-diameter medium-strength heat-resistant magnesium alloy ingot

A casting process and large-diameter technology, which is applied in the field of magnesium alloy casting and semi-continuous casting of g-Al-Ag magnesium alloy ingots, can solve the problems of increasing edge cracking tendency, increasing casting difficulty, inclusions, etc., to avoid The effect of edge cracking and reducing slag inclusion

Active Publication Date: 2016-01-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the key factors affecting its preparation is the lack of preparation technology for large-diameter, high-quality magnesium alloy ingots
Magnesium alloys are prone to a large number of defects such as inclusions, pores, porosity, and cracks during the casting process, and large-diameter ingots are prone to edge cracks during the casting process, making casting difficult
Especially the addition of Ag and RE elements increases the tendency of edge cracking and increases the difficulty of casting

Method used

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  • Semi-continuous casting process of large-diameter medium-strength heat-resistant magnesium alloy ingot
  • Semi-continuous casting process of large-diameter medium-strength heat-resistant magnesium alloy ingot
  • Semi-continuous casting process of large-diameter medium-strength heat-resistant magnesium alloy ingot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1 : In a smelting furnace with a capacity of 1 ton, high-purity magnesium, high-purity aluminum, high-purity zinc, Mg-Mn master alloy, high-purity silver, Mg-RE master alloy, and Mg-Ca master alloy are melted in sequence, and the melting temperature is controlled at 650- 680°C. After all the raw materials are melted, the surface slag is removed, and then argon gas is introduced to stir for 20 minutes. After stirring, close the furnace cover and pass SF to the surface of the melt 6 with CO 2 The mixed gas is used for protection, and at the same time, the temperature of the melt is raised to 730-740°C for 15 minutes. After the high-temperature heat preservation, cut off the power of the heating furnace, control the temperature of the melt at 690-700°C, and let it stand for 2 hours. Then cast the ingot. During the casting process, the melt temperature in the furnace is controlled at 670-680° C., the melt temperature in the crystallizer is 650-660° C., and the ...

Embodiment 2

[0017] Example 2 : In a smelting furnace with a capacity of 1 ton, high-purity magnesium, high-purity aluminum, high-purity zinc, Mg-Mn master alloy, high-purity silver, Mg-RE master alloy, and Mg-Ca master alloy are melted in sequence, and the temperature of the melt is controlled at 630 during the melting process -640°C. After all the raw materials are melted, the surface slag is removed, and then argon gas is introduced to stir for 25 minutes. After stirring, close the furnace cover and pass SF to the surface of the melt 6 with CO 2 The mixed gas is used for protection, and at the same time, the temperature of the melt is raised to 730-740°C for 20 minutes. After the high-temperature heat preservation, cut off the power of the heating furnace, control the temperature of the melt at 680-690°C, and let it stand for 3 hours. Then cast the ingot, and control the temperature of the melt in the furnace to 660-670°C, the temperature of the melt in the crystallizer to 640-650°...

Embodiment 3

[0018] Example 3 : In a smelting furnace with a capacity of 1 ton, high-purity magnesium, high-purity aluminum, high-purity zinc, Mg-Mn master alloy, high-purity silver, Mg-RE master alloy, and Mg-Ca master alloy are melted in sequence, and the melt temperature is controlled at 640 during the melting process -650°C. After all the raw materials are melted, remove the slag on the surface, and then introduce argon gas to stir for 30 minutes. After stirring, close the furnace cover and pass SF to the surface of the melt 6 with CO 2 The mixed gas is used for protection, and at the same time, the temperature of the melt is raised to 730-740°C for 20 minutes. After the high-temperature heat preservation, cut off the power of the heating furnace, and control the temperature of the melt at 690-700°C for 3 hours. Then cast the ingot. During the casting process, the temperature of the melt in the furnace is controlled at 670-680° C., the temperature of the melt in the crystallizer i...

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Abstract

The invention discloses a semi-continuous casting process of a large-diameter medium-strength heat-resistant magnesium alloy, and the alloy composition (wt.%) aimed at is: Al? 7.5-9.0%, Ag? 0.02-0.80%, Zn? 0.35-0.55%, Mn? 0.05-0.20%, RE? 0.01-0.10%, Ca? 0.001-0.020%, the rest is Mg and non-removable impurity elements. The process includes the steps of melting raw materials at 620-680°C, ventilating and stirring, raising the temperature to 720-740°C for 10-20min, standing at 680-700°C for 1-3h, and casting at low temperature. By adjusting the process parameters of each step, a magnesium alloy ingot with a diameter of Ф330-630mm and a length of ≥1000mm was successfully cast. Large-diameter, high-quality ingots can provide high-quality blanks for the forming of large-scale structural parts, which is of great significance for promoting the wide application of magnesium alloys.

Description

technical field [0001] The invention relates to the field of magnesium alloy casting, in particular to the field of semi-continuous casting of Mg-Al-Ag series magnesium alloy ingots. Background technique [0002] Magnesium alloy is currently the lightest metal structural material, with low density, high specific strength, and good anti-magnetic and anti-seismic effects. It is an ideal weight-reducing material in aerospace, transportation and other fields. Conventional commercial magnesium alloys such as Mg-Al-Zn series and Mg-Zn-Zr series alloys have poor heat resistance and cannot meet the high temperature requirements of aerospace, transportation and other fields. Adding Ag and rare earth elements to magnesium can significantly improve its heat resistance. The study found that the Mg-Al-Ag alloy has high strength and good heat resistance, and has broad application prospects in aerospace, transportation and other fields. [0003] The application of large-size magnesium al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C1/03B22D11/00
Inventor 刘楚明肖宏超黄岑张绪虎石刚韩修柱蒋树农
Owner CENT SOUTH UNIV
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