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Preparing method of fine-grain large-size magnesium alloy profile

A magnesium alloy, large-size technology, applied in the field of preparation of fine-grained large-size magnesium alloy profiles, to achieve simple process, increase the temperature of the edge of the billet, and prevent the cracking of the billet

Active Publication Date: 2020-03-13
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is aimed at refining the grains of small-sized magnesium alloys with an outer diameter of 60-100mm and a height of 30-50mm, and is not suitable for manufacturing large-sized magnesium alloy profiles and refining the grains of large-sized magnesium alloy profiles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing a fine-grained large-size magnesium alloy profile, the steps comprising:

[0026] Step 1, place the magnesium alloy (Mg-8.3Gd-4.8Y-1.2Zn-0.5Zr alloy) ingot (with a specification of Ф500*800mm) in an atmosphere of 510°C for 23 hours, and perform homogenization heat treatment;

[0027] Step 2, heat the upper and lower cutting boards at 280°C, place the homogenized magnesium alloy ingot on the cutting board for radial upsetting, and control the amount of downsetting for this upsetting to 35%, and the obtained upsetting The rough parts are compressed three times according to the "X-Y-Z-direction" cycle, and the compression amount of the upsetting parts is controlled at 28% each time, and they are rounded after compression; for example, the size of the upsetting parts in the X direction before the first compression is 800mm, then the first compression amount is 800*0.28=224mm;

[0028] Step 3, return the rounded blank in step 2 to furnace for heat pre...

Embodiment 2

[0037] A method for preparing a fine-grained large-size magnesium alloy profile, the steps comprising:

[0038] Step 1. Place the magnesium alloy (Mg-6.5Gd-3.3Y-0.9Zn-0.5Mn alloy) ingot (with a specification of Ф650*850mm) in an atmosphere at 520°C for 30 hours and perform homogenization heat treatment;

[0039] Step 2: heat the upper and lower cutting boards at 280°C, and place the homogenized magnesium alloy ingot on the cutting board for radial upsetting. The rough parts are compressed three times according to the "X-Y-Z-direction" cycle, and the compression amount of the upsetting parts is controlled at 35% each time, and they are rounded after compression;

[0040] Step 3, return the rounded blank in step 2 to furnace for heat preservation, control the heat preservation temperature to 470°C, and control the heat preservation time to 0.8h;

[0041] Step 4, upsetting the billet after the heat preservation in step 3, and controlling the amount of downsetting for this upsett...

Embodiment 3

[0049] A method for preparing a fine-grained large-size magnesium alloy profile, the steps comprising:

[0050] Step 1, place the magnesium alloy (Mg-2.3Gd-2.7Y-0.3Zn-0.3Mn alloy) ingot (with a specification of Ф660*850mm) in an atmosphere at 500°C for 20 hours, and perform homogenization heat treatment;

[0051] Step 2, heat the upper and lower cutting boards at 290°C, place the homogenized magnesium alloy ingot on the cutting board for radial upsetting, and control the amount of downsetting for this upsetting to 40%, and the obtained upsetting The rough parts are compressed three times according to the "X-Y-Z-direction" cycle, and the compression amount of the upsetting parts is controlled at 20% each time, and they are rounded after compression;

[0052] Step 3, return the rounded blank in step 2 to furnace for heat preservation, control the heat preservation temperature to 490°C, and control the heat preservation time to 0.5h;

[0053] Step 4, upsetting the billet after h...

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Abstract

The invention provides a preparing method of a fine-grain large-size magnesium alloy profile. The method sequentially includes the steps of performing homogenization heat treatment on a magnesium alloy ingot blank, performing upsetting, three times of cyclic compressing and rolling, putting the magnesium alloy ingot blank back into a furnace for heat preserving, performing upsetting, four times ofcyclic compressing and rolling, putting the magnesium alloy ingot blank back into the furnace for heat preserving, performing upsetting, five times of cyclic compressing and rolling, putting the magnesium alloy ingot blank back into the furnace for heat preserving, performing upsetting, six times of cyclic compressing and rolling, putting the magnesium alloy ingot blank back into the furnace forheat preserving, performing extruding by means of residual heat, and performing quenching at an extrusion outlet through an annular nozzle to obtain the magnesium alloy profile. By means of the method, the blank can be effectively prevented from cracking in the preparing process, the edge temperature and deformability of the blank can be improved, complete static recrystallization can happen to magnesium alloy, more importantly, grains of the magnesium alloy profile can be refined, and the preparing method is particularly suitable for preparing the large-size magnesium alloy profile.

Description

technical field [0001] The invention relates to the preparation technology of magnesium alloy profiles, in particular to a preparation method of fine-grained and large-size magnesium alloy profiles. The large size in the present invention means that the outline size of any two dimensions of the magnesium alloy profile is not less than 120mm, and the outline size does not include the wall thickness. Background technique [0002] With the rapid development of aerospace, national defense and military technologies, the demand for the types and quantities of lightweight materials such as magnesium alloys and aluminum alloys in related industries has increased sharply. Magnesium alloy has the advantages of low density, high specific strength and specific stiffness, good damping and vibration reduction, and abundant resources. It is currently the lightest metal structural material in engineering applications and is known as "inexhaustible lightweight material". "Green engineering ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J1/06B21J5/00B21C23/21C22F1/06C22C23/06
CPCB21C23/21B21J1/06B21J5/002B21J5/008C22C23/06C22F1/06
Inventor 夏祥生胡传凯黄少东黄树海林军康凤李辉赵祖德
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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