Process method for preparing magnesium alloy through electro-slag remelting

A technology of electroslag remelting and process method, which is applied in the field of magnesium alloy production, can solve the problems of coarse grain and poor performance of magnesium alloy, and achieve the effect of fine grain, low cost and simple process

Inactive Publication Date: 2013-01-09
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 has coarse grains and poor performance, and usually requires complex plastic deformation and heat treatment before it can be put into use.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Pure magnesium, pure aluminum and pure zinc are mixed according to the mass percentage of 94%, 5% and 1%, and then in SF 6 +CO 2 - Melted in a crucible furnace at 850°C under the protection of mixed gas to make a consumable electrode rod; the mass percentage is 12%CaO, 10%Al 2 o 3 , 16% MgO, 62% CaF 2 Mix evenly, keep warm at 800°C for 6 hours as electroslag material, and keep it in the oven until it is taken out before electroslag remelting to ensure dryness; put the consumable electrode rod into the electroslag furnace for smelting, electroslag The working voltage of the furnace is 30V, the working current is 1.5kV, the arc starting block is pure aluminum block, and the arc starting slag is CaF 2 , the smelting process in SF 6 +CO 2 -Proceed under the protection of mixed gas. During the smelting process, electroslag material is added as needed until the electroslag process is completed; the magnesium alloy ingot after electroslag smelting is annealed at 500°C for...

Embodiment 2

[0023] Mix pure magnesium, pure yttrium and pure zinc according to the mass percentage of 90.5%, 7% and 2.5% in SF 6 +CO 2 - Melted in a crucible furnace at 880°C under the protection of mixed gas to make a consumable electrode rod; the mass percentage is 10%CaO, 15%Al 2 o 3 , 20% MgO, 55% CaF 2 Mix evenly, keep warm at 800°C for 6 hours as electroslag material, and keep it in the oven until it is taken out before electroslag treatment to ensure drying; put the consumable electrode rod into the electroslag furnace for smelting, and the electroslag furnace The working voltage is 35V, the working current is 2.0kV, the arc starting block is pure aluminum block, and the arc starting slag is CaF 2 , the smelting process in SF 6 +CO 2 -Proceed under the protection of mixed gas. During the smelting process, electroslag material is added as needed until the electroslag process is completed; the magnesium alloy ingot after electroslag smelting is annealed at 520°C for 5 hours, and...

Embodiment 3

[0027] A kind of electroslag remelting prepares the technological method of magnesium alloy, and its technological step is as follows:

[0028] (a) First mix the magnesium alloy raw materials to be prepared in SF 6 +CO 2 - Melted in a crucible furnace at 800°C to 900°C under the protection of a mixed gas to make a consumable electrode rod. In this embodiment, according to the mass percentage of aluminum in the magnesium alloy being 1%, 3% or 5%, the Pure magnesium and pure aluminum are mixed and smelted in a vacuum induction furnace at 800°C, 850°C or 900°C to make consumable electrode rods;

[0029] (b) Put the consumable electrode rod into the electroslag furnace for electroslag smelting. The working voltage of the electroslag furnace is 25-40V, the working current is 0.8-5kA, the arc starting block is pure aluminum block, and the arc starting slag is CaF 2 , the smelting process in SF 6 +CO 2 -Proceed under the protection of mixed gas. During the smelting process, add e...

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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

technical field [0001] 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 [0002] 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. [0003] 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 alloy systems, but only a small number...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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