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Microstructure Uniformity Control Technology of Large Size Magnesium Alloy Profiles

A technology of uniform structure and magnesium alloy, which is applied in the field of control technology of microstructure uniformity of large-size magnesium alloy profiles, can solve the problem of unsuitable uniformity control of magnesium alloy profiles.

Active Publication Date: 2020-10-23
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

Although the forging structure with uniform carbides and fine grains can be obtained by using this method, it is not suitable for the control of the uniformity of the structure of magnesium alloy profiles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The microstructure uniformity control process of large-size magnesium alloy profiles, the steps include:

[0025] In step A, the magnesium alloy ingot (Mg-8.5Gd-4.5Y-2Zn-0.5Zr alloy ingot) is kept at 512°C for 28 hours for homogenization heat treatment;

[0026] Step B, upsetting the magnesium alloy ingot after the homogenization treatment, and controlling the upsetting pressure to 50%;

[0027] In step C, the upsetting piece obtained in step B is subjected to 45° counter-pressing twice, and the reduction amount is controlled to 20% each time;

[0028] Step D, compressing the pressed blank in step C once according to "X direction-Y direction-Z direction", and controlling the reduction amount in each direction to 50%;

[0029] In step E, the blank compressed in step D is elongated 3 times, and the pressing amount is controlled to 20% each time;

[0030] Step F, turning the billet drawn in step E by 90° for upsetting, and controlling the amount of downsetting for upsett...

Embodiment 2

[0039] The microstructure uniformity control process of large-size magnesium alloy profiles, the steps include:

[0040] In step A, the magnesium alloy ingot (Mg-5Gd-2.3Y-0.5Zn-0.6Zr alloy ingot) is kept at 500°C for 25 hours for homogenization heat treatment;

[0041] Step B, upsetting the magnesium alloy ingot after the homogenization treatment, and controlling the upsetting pressure to 55%;

[0042] Step C, carry out two 45° opposite pressures on the upset piece obtained in step B, and control the amount of each reduction to 15%;

[0043] Step D, compressing the pressed blank in step C once according to "X direction-Y direction-Z direction", and controlling the reduction amount in each direction to 45-55%;

[0044] In step E, the blank compressed in step D is elongated 3 times, and the pressing amount is controlled to 25-30% each time;

[0045] Step F, turning the billet drawn in step E by 90° for upsetting, and controlling the amount of downsetting for upsetting to 60%; ...

Embodiment 3

[0054] The microstructure uniformity control process of large-size magnesium alloy profiles, the steps include:

[0055] Step A, homogenizing the magnesium alloy ingot (Mg-9.5Gd-7.8Y-1.4Zn-0.5Mn alloy ingot) at 520°C for 20 hours for homogenization heat treatment;

[0056] Step B, upsetting the magnesium alloy ingot after the homogenization treatment, and controlling the upsetting pressure to 50%;

[0057] Step C, carry out two 45° opposite pressures on the upsetting piece obtained in step B, and control the amount of each reduction to 25%;

[0058] Step D, compressing the pressed blank in step C once according to "X direction-Y direction-Z direction", and controlling the reduction amount in each direction to 55-60%;

[0059] In step E, the blank compressed in step D is drawn for 3 times, and the pressing amount is controlled to 30% each time;

[0060] Step F, turning the billet drawn in step E by 90° for upsetting, and controlling the amount of downsetting for upsetting to ...

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Abstract

The invention provides a large-sized magnesium alloy profile structure homogeneity control process which sequentially comprises the steps of carrying out homogenization heat treatment on a magnesium alloy ingot blank, upsetting the magnesium alloy ingot blank, pairwise pressing an upsetting piece at 45 degrees for two times, compressing the blank for one time according to 'X direction-Y direction-Z direction', drawing out the blank for three times, turning over the blank at 90 degrees, and upsetting; pairwise pressing the obtained upsetting piece at 45 degrees for two times again, then remelting and keeping warm, and repeating the steps B to G for two times; then remelting and keeping warm, and repeating the steps B to G for three times; and rolling the blank, extruding the rolled blank byutilizing waste heat, sampling at an extrusion outlet part, hardening through an annular nozzle, and obtaining a magnesium alloy profile. According to the magnesium alloy profile manufactured by adopting the method provided by the invention, the grain size is not larger than 8mum, the dimension difference of grains at different parts is less than or equal to 20 percent, and the problem of structure heterogeneity of a large-sized magnesium alloy profile manufactured by a traditional manufacturing process is solved.

Description

technical field [0001] The invention relates to the manufacture of large-size (the large-size refers to the outline size of any two dimensions greater than 115mm*115mm) magnesium alloys, and specifically relates to the microstructure uniformity control process of large-size magnesium alloy profiles. Background technique [0002] The document CN107999551A discloses a method for preparing a magnesium alloy profile, which includes the following steps: providing a magnesium alloy billet, placing the magnesium alloy billet in a mold, and reciprocatingly extruding the magnesium alloy billet to obtain a magnesium alloy profile; during reciprocating extrusion, The positive pressure is 200KN-500KN, and the back pressure is 200KN-500KN. Preferably, the magnesium alloy billet is machined before being placed in the mold. Wherein, the reciprocating extrusion is extruding with a reciprocating extrusion die containing a necking area inside, so that the magnesium alloy billet is also subje...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22F1/06
CPCC22C23/06C22F1/002C22F1/06
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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