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Magnesium alloy forged piece and manufacturing method thereof

A magnesium alloy and forging technology, which is applied to the field of high ductility and medium strength magnesium alloy large forgings and its preparation, can solve the problem that the magnesium alloy large forgings are difficult to process, the final forging temperature of ingots is low and easy to crack, and the yield and mechanical properties are low. and other problems, to achieve the effect of significant softening effect, significant grain refinement, and large dynamic recrystallization driving force.

Active Publication Date: 2021-04-02
CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current application of magnesium alloys is still dominated by extruded plate profiles and rolled plates, and the application of large-scale block forgings is less
The main reasons are: 1. Magnesium alloy has a close-packed hexagonal crystal structure, and its plastic processing performance is poor; 2. Free forging is a cooling process, and the final forging temperature of the ingot is low and easy to crack; 3. There are hard-to-deform areas in large-scale forgings, and plastic deformation Insufficient; resulting in difficulty in processing large magnesium alloy forgings, low yield and low mechanical properties

Method used

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  • Magnesium alloy forged piece and manufacturing method thereof
  • Magnesium alloy forged piece and manufacturing method thereof
  • Magnesium alloy forged piece and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0068] The present invention will be described in detail below by taking an Mg-5Al-2.8Zn-0.3Mn-0.017Ca-0.08Gd (wt.%) alloy forging as an example.

[0069] 1. Using semi-continuous casting, the melt temperature in the furnace is 683°C during stable casting, the ingot pulling speed is 58mm / min, and a magnesium alloy casting rod with a diameter of Φ270mm and a length of 5000mm is obtained;

[0070] 2. After homogenized annealing at 420°C for 10 hours, the forged ingot with a diameter of Φ240mm and a length of 310mm was obtained by mechanical turning, ultrasonic flaw detection, sawing and blanking;

[0071] 3. Heat the ingot to 440°C for 8 hours, and preheat the upper and lower flat anvils of the hydraulic press to 400°C;

[0072] 4. Take the high direction of the ingot and any two vertical radial directions as the Z, Y, and X directions, first perform 4 passes of upsetting along the Z and Y directions, the reduction speed is 12-15mm / s, and the reduction amount of each pass 35-50...

Embodiment 2

[0075] The present invention will be described in detail below by taking a Mg-4.0Al-2.9Zn-0.6Mn-0.007Ca-0.09Gd-0.24Y (wt.%) alloy forging as an example.

[0076] 1. Using semi-continuous casting, the melt temperature in the furnace is 675°C during stable casting, and the ingot pulling speed is 60mm / min, to obtain a magnesium alloy cast rod with a diameter of Φ270mm and a length of 5000mm;

[0077] 2. After the cast rod is homogenized and annealed at 420°C for 10 hours, the forged ingot with a diameter of Φ240mm and a length of 355mm is obtained by mechanical turning, ultrasonic flaw detection, sawing and blanking;

[0078] 3. Heat the ingot to 420°C for 8 hours, and preheat the upper and lower flat anvils of the hydraulic press to 400°C;

[0079] 4. Take the high direction of the ingot and any two vertical radial directions as the Z, Y, and X directions. Firstly, carry out 4 passes of upsetting along the Z and Y directions, the reduction speed is 10-14mm / s, and the reduction a...

Embodiment 3

[0082] The present invention will be described in detail below by taking a Mg-4.3Al-3.2Zn-0.1Mn-0.004Ca-0.46Y (wt.%) alloy forging as an example.

[0083] 1. Using semi-continuous casting, the melt temperature in the furnace is 680°C during stable casting, and the ingot pulling speed is 44mm / min, to obtain a magnesium alloy cast rod with a diameter of Φ310mm and a length of 4500mm;

[0084] 2. After the cast rod is homogenized and annealed at 420°C for 10 hours, the forged ingot with a diameter of Φ270mm and a length of 540mm is obtained by mechanical turning, ultrasonic flaw detection, sawing and blanking;

[0085] 3. Heat the ingot to 440°C for 10 hours, and preheat the upper and lower flat anvils of the hydraulic press to 420°C;

[0086] 4. Take the height direction of the ingot and any two vertical radial directions as the Z, Y, and X directions. Firstly, carry out 5 passes of upsetting along the Z and Y directions, the reduction speed is 10-15mm / s, and the reduction amoun...

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Abstract

Magnesium alloy comprises, by mass percentage, 3.5%-5.0% of Al, 2.0%-3.5% of Zn, 0.1%-0.8% of Mn, 0.01%-0.80% of RE, 0.001%-0.090% of Ca, other inevitable impurity elements and the balance magnesium,wherein the sum of the content of Al and the content of Zn is larger than or equal to 6% and smaller than or equal to 8%, and RE is a rare earth element. A forging technology is developed, a high-ductility medium-strength magnesium alloy large forged piece is successfully manufactured, and the wider application of large-specification magnesium alloy bearing structural parts is promoted.

Description

technical field [0001] The invention relates to a magnesium alloy forging and a preparation method thereof, in particular to a high ductility medium-strength magnesium alloy large forging and a preparation method thereof. Background technique [0002] With the upgrading of aerospace and national defense weapons and equipment, there is an urgent need for lightweight materials for large-scale load-bearing structural parts, and at the same time require lower costs. Magnesium alloy is the lightest metal structural material in practical application. It has the advantages of low density, high specific strength and rigidity, good electromagnetic shielding, good damping and shock absorption effect, and easy machining. It is known as "21st century green engineering material". , has broad application prospects in the fields of aerospace, national defense and military industry, and automobiles. [0003] Mg-Al-Zn (AZ) series alloys have become the most widely used wrought magnesium all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/08B21J5/00C22C23/02C22C1/03C22F1/06
CPCB21J5/08B21J5/002C22C23/02C22C1/03C22F1/06
Inventor 曾钢肖宏超熊雯瑛康心锴周承伟
Owner CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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