Process method for preparing magnesium alloy through electro-slag remelting

A process method and electroslag remelting technology are applied in the field of magnesium alloy production, which can solve the problems of coarse grains and poor performance of magnesium alloys, and achieve the effects of grain refinement, low cost and simple process.

Inactive Publication Date: 2011-06-15
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production method of magnesium alloy ingot is mainly gas protection induction melting, but the magnesium alloy prepared by this

Method used

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  • Process method for preparing magnesium alloy through electro-slag remelting
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  • Process method for preparing magnesium alloy through electro-slag remelting

Examples

Experimental program
Comparison scheme
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Example Embodiment

Example 1

The pure magnesium, pure yttrium and pure zinc are mixed according to the mass percentages of 90.5%, 7%, and 2.5% and then smelted in a crucible furnace at 880°C under the protection of SF6+CO2- mixed gas to make consumable electrodes; the mass percentage is 10 %CaO, 15%Al2O3, 20%MgO, 55%CaF2 are mixed uniformly, kept at 800℃ for 6 hours as electroslag slag, and kept in the oven until it is taken out before the electroslag treatment to ensure dryness; The electrode rod is loaded into the electroslag furnace for smelting. The working voltage of the electroslag furnace is 35V, the working current is 2.0kV, the ignition block is pure aluminum, and the ignition slag material is CaF2. The smelting process is carried out under the protection of SF6+CO2- mixed gas In the smelting process, add electroslag slag material as needed until the electroslag process is completed; the magnesium alloy ingots after electroslag smelting are annealed at 520℃ for 5 hours, during which argo...

Example Embodiment

Example 2

The pure magnesium, pure yttrium and pure zinc are mixed according to the mass percentages of 90.5%, 7%, and 2.5% and then smelted in a crucible furnace at 880°C under the protection of SF6+CO2- mixed gas to make consumable electrodes; the mass percentage is 10 %CaO, 15%Al2O3, 20%MgO, 55%CaF2 are mixed uniformly, kept at 800℃ for 6 hours as electroslag slag, and kept in the oven until it is taken out before the electroslag treatment to ensure dryness; The electrode rod is loaded into the electroslag furnace for smelting. The working voltage of the electroslag furnace is 35V, the working current is 2.0kV, the ignition block is pure aluminum, and the ignition slag material is CaF2. The smelting process is carried out under the protection of SF6+CO2- mixed gas In the smelting process, add electroslag slag material as needed until the electroslag process is completed; the magnesium alloy ingots after electroslag smelting are annealed at 520℃ for 5 hours, during which argo...

Example Embodiment

Example 3

Process method for preparing magnesium alloy by electroslag remelting

(A) Firstly, the magnesium alloy raw materials to be prepared are mixed and then smelted in a crucible furnace at 800℃~900℃ under the protection of SF6+CO2-mixed gas to make consumable electrode rods;

(B) Load the consumable electrode rods into an electroslag furnace for electroslag smelting. The electroslag furnace has a working voltage of 25-40V and a working current of 0.8-5kA. The pilot arc block is pure aluminum, and the arc slag material is CaF2 The smelting process is carried out under the protection of SF6+CO2- mixed gas. During the smelting process, the electroslag slag material that has been kept at 700°C to 850°C for 6 to 8 hours is added. The amount of electroslag slag added is 3% of the mass of the consumable electrode. %~4%, the electroslag slag material is composed of CaO, Al2O3, MgO and CaF2, and the mass percentage of the electroslag slag material is: 5%~15% CaO, 5%~20% Al2O3, 10%~ ...

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Abstract

The invention discloses a process method for preparing magnesium alloy through electro-slag remelting, which comprises the following steps of: mixing raw materials for preparing the magnesium alloy, and smelting at the temperature of between 800 and 900DEG C under the protection of SF6 and CO2- gases in a crucible to prepare a consumable electrode bar; filling in an electroslag furnace for electroslag smelting, wherein the working voltage is 25-40V, the working current is 0.8-5kA, an arc strike block is a pure aluminum block, arc strike slag is CaF2, the protective gases are SF6 and CO2- gases, the electroslag material kept at the temperature of between 700 and 850DEG C for 6 to 8 hours is added in the smelting process, the adding amount of the electroslag material is 3 to 4 percent of the mass of the consumable electrode bar, and the electroslag material comprises the following components in percentage by mass: 5 to 15 percent of CaO, 5 to 20 percent of Al2O3, 10 to 30 percent of MgOand the balance of CaF2; and performing annealing treatment on a magnesium alloy ingot which is quickly consolidated by a water cooled crystallizer at the temperature of between 500 and 525DEG C for 3 to 5 hours, and machining to obtain the finished product.

Description

Electroslag remelting process for preparing magnesium alloy technical field The invention relates to a process method for preparing magnesium alloy by electroslag remelting, which belongs to the field of magnesium alloy production. Background technique Magnesium alloys are the lightest (lowest density) metallic structural materials that can be produced and applied on a large scale. Magnesium alloy has high specific strength and specific stiffness, good machinability and damping performance, so it is an ideal material for many products to achieve lightweight. In recent years, driven by the low-carbon economy, the energy saving and emission reduction of automobile products has become the focus of social attention, and magnesium alloy has therefore become one of the important materials of modern automobile products. So far, there are dozens of grades of commercial magnesium alloys, covering Mg-Al-Zn (AZ), Mg-Al-Si (AS), Mg-Al-RE (AE), Mg-Zn series and Mg-RE There are many ...

Claims

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Application Information

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IPC IPC(8): C22B9/18C22C1/02C22C23/00
Inventor 白晶刘欢薛烽周健孙扬善
Owner SOUTHEAST UNIV
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