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Magnesium alloy thick plate and preparation method thereof

A magnesium alloy and alloy composition technology, applied in the field of magnesium alloy materials, can solve the problems of difficulty in thick plate rolling forming, huge impact on product performance, and large difference in rolling process, and achieve the effect of solving difficult rolling

Active Publication Date: 2021-03-12
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, there is an obvious rolling texture in the thick plate along the rolling direction, which leads to significant anisotropy of the plate, which is not conducive to the actual use of the plate; and the thick plate is difficult to roll and has high requirements on the deformation capacity of the material
At the same time, for different alloy systems, the rolling process is quite different, and the difference in process has a great impact on the performance of the product

Method used

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  • Magnesium alloy thick plate and preparation method thereof
  • Magnesium alloy thick plate and preparation method thereof
  • Magnesium alloy thick plate and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0049] The present invention is described in detail by taking a Mg-4.1Al-3.5Zn-0.2Mn-0.016Ca-0.47Gd (wt.%) alloy plate as an example.

[0050] 1. Semi-continuous casting to obtain a magnesium alloy cast rod with a diameter of Φ370mm and a length of 4000mm;

[0051] 2. After homogenized annealing of the cast rod, the forging billet with a diameter of Φ340mm and a length of 400mm is obtained by machining, ultrasonic flaw detection, and sawing blanking. The homogenized annealing process is: 420°C for 15h; Free forging into 400mm wide and 80mm thick billets;

[0052] 3. The billet is kept at 460°C for 3 hours, the roll temperature is heated to 250°C, and the rolling speed is 20m / min. After 4 passes of multi-directional, variable temperature, and variable pressure rolling, a 45mm thick, 800mm wide, and 1000mm long billet is obtained. For thick plates, the reductions in each pass are 18.8%, 15.4%, 12.7%, and 6.3%. During the hot rolling process, the billet is alternately rolled along...

Embodiment 2

[0055] The present invention is described in detail by taking the Mg-4.5Al-2.4Zn-0.5Mn-0.008Ca-0.32Gd-0.18Y (wt.%) alloy plate as an example.

[0056] 1. Semi-continuous casting to obtain a magnesium alloy cast rod with a diameter of Φ250mm and a length of 5000mm;

[0057] 2. After homogenized annealing of the casting rod, the forging billet with a diameter of Φ230mm and a length of 350mm is obtained by machining, ultrasonic flaw detection, and sawing blanking. The homogenization annealing process is: 420°C for 15h; Free forging into 350mm wide and 80mm thick billets;

[0058] 3. The billet is kept at 460°C for 3 hours, the roll temperature is heated to 250°C, and the rolling speed is 20m / min. After 6 passes of multi-directional, variable temperature, and variable pressure rolling, a 25mm thick, 670mm wide, and 900mm long billet is obtained. For thick plates, the reductions are 25.0%, 25.0%, 26.7%, 9.1%, 6.7%, and 10.7%. During the hot rolling process, the billet is alternate...

Embodiment 3

[0061] The present invention is described in detail by taking a Mg-4.1Al-3.5Zn-0.2Mn-0.016Ca-0.47Gd (wt.%) alloy plate as an example.

[0062] 1. Semi-continuous casting to obtain a magnesium alloy cast rod with a diameter of Φ370mm and a length of 4000mm;

[0063] 2. After homogenized annealing of the cast rod, the forging billet with a diameter of Φ340mm and a length of 400mm is obtained by machining, ultrasonic flaw detection, and sawing blanking. The homogenized annealing process is: 420°C for 15h; Free forging into 400mm wide and 80mm thick billets;

[0064] 3. The billet is kept at 450°C for 3 hours, the roll temperature is heated to 250°C, and the rolling speed is 20m / min. After 4 passes of multi-directional, variable temperature, and variable pressure rolling, a 45mm thick, 800mm wide, and 1000mm long billet is obtained. For thick plates, the reductions are 18.8%, 15.4%, 12.7%, and 6.3%, respectively. During the hot rolling process, the billet is alternately rolled al...

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Abstract

The invention aims to provide a preparation method of a novel magnesium alloy thick plate. The alloy comprises, by mass, 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, less than or equal to 0.005% of Fe, less than or equal to 0.05% of Si, less than or equal to 0.005% of Cu, less than or equal to 0.005% of Ni and the balance Mg, and the total content of impurities does not exceed 0.1%, wherein the sum of the Al content and the Zn content satisfies the condition that Al+Zn is greater than or equal to 6% and less than or equal to 8%. Aiming at a novel Mg-Al-Zn alloy system, a forming process for preparing the large-size magnesium alloy thick plate with low anisotropy and high strength is developed to satisfy urgent demands of such fields as aerospace, weaponry and automobiles on the magnesium alloy thick plate with low cost and high performance.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy materials, and in particular relates to a preparation method of a large-scale magnesium alloy thick plate and a magnesium alloy thick plate prepared by the method. Background technique [0002] Magnesium alloy has the advantages of high specific strength and rigidity, good thermal conductivity, excellent electromagnetic shielding and damping performance, and easy machining. It is the lightest metal structural material in practical applications, and its density is only 2 / 3 of that of aluminum alloy. 1 / 4 of steel. Therefore, magnesium alloy is an ideal lightweight structural material, and its remarkable weight reduction effect makes it have a very broad market in the fields of aerospace, national defense and military industry, automobiles, and rail transit. [0003] However, compared with other metals, the absolute strength of pure magnesium is relatively low, and it is usually necessary to...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22F1/06
CPCC22C23/02C22F1/06
Inventor 康心锴刘润芳曾钢肖宏超刘海平
Owner CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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