High-strength heat-resistant magnesium alloy sheet and manufacturing method thereof

A magnesium alloy, heat-resistant technology, used in metal rolling, heat treatment equipment, profile control, etc., can solve problems such as difficult leveling, poor low-temperature plasticity, and reduced sheet performance, to improve production efficiency, eliminate deformation stress, The effect of improving overall performance

Active Publication Date: 2021-12-31
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

Magnesium alloys generally need to be rolled at higher temperatures due to their poor low-temperature plasticity, and high rolling temperatures will affect the mechanical properties of the final sheet; and for different alloy systems, the rolling process is quite different. The nuances of the process have a huge impact on the performance of the product
[0004] The flatness of the rolled sheet is poor, especially the thin sheet with a thickness of ≤1mm and a length and width of ≥200*300mm, which is basically unusable without leveling treatment
The rigidity of magnesium alloy is relatively large, and it is difficult to level at room temperature. The traditional leveling process needs to heat the plate to a higher temperature. During the hot rolling and hot leveling process, the performance of the plate is reduced due to high temperature annealing.
The Mg-Gd-Y series alloy belongs to the heat-treatable strengthened magnesium alloy, and the material properties can be improved by subsequent solution + aging treatment. The traditional process is to roll the plate to the target thickness and then perform solution + aging treatment, but During the solution treatment process, the sheet will be severely deformed and unusable

Method used

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  • High-strength heat-resistant magnesium alloy sheet and manufacturing method thereof
  • High-strength heat-resistant magnesium alloy sheet and manufacturing method thereof
  • High-strength heat-resistant magnesium alloy sheet and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of Mg-9.2Gd-2.6Y-0.5Zr(VW93) Alloy Sheet

[0037] a) A VW93 magnesium alloy billet of 10*200*250mm was kept at 520°C for 2 hours for preheating.

[0038] b) The preheated billet is hot-rolled to a thickness of about 5mm through 3 fires, and the reductions of each heat are 10%, 22.2% and 28.6% respectively; The rolling direction and the vertical direction are continuously reversed and rolled, the rolling speed is 10m / min, the roll temperature is 180°C, and the fire insulation is kept at 520°C for 20min. The 5mm-thick plate was kept at 520°C for 1.5h for the first intermediate annealing. After the first annealing is completed, it is hot rolled to a thickness of about 1.5mm after 4 fires, and the reductions are 20%, 30%, 28.6% and 25% respectively; the rolling speed is 14m / min, the roll temperature is 200°C, and the fire is kept Incubate at 520°C for 15 minutes. The 1.5mm thick plate was kept at 520°C for 1h for the second intermediate annealing. After the ...

Embodiment 2

[0044] Preparation of Mg-9.2Gd-2.6Y-0.5Zr(VW93) Alloy Sheet

[0045] a) A VW93 magnesium alloy billet of 10*200*250mm was kept at 520°C for 2 hours for preheating.

[0046]b) The preheated billet is hot rolled to a thickness of about 5 mm through 3 fires, and the reduction amount of each fire (that is, the deformation amount of each fire) is 10%, 22.2% and 28.6% respectively; 4 passes per fire Rolling, during the rolling process, the rolling direction and the vertical direction are continuously reversed and rolled, the rolling speed is 10m / min, the roll temperature is 180°C, and the fire insulation is kept at 520°C for 20min. The 5mm-thick plate was kept at 520°C for 1.5h for the first intermediate annealing. After the first annealing is completed, it is hot rolled to a thickness of about 1.5mm after 4 fires, and the reductions are 20%, 30%, 28.6% and 25% respectively; the rolling speed is 14m / min, the roll temperature is 200°C, and the fire is kept Incubate at 520°C for 15 ...

Embodiment 3

[0052] Preparation of Mg-9.2Gd-2.6Y-0.5Zr(VW93) Alloy Sheet

[0053] a) A VW93 magnesium alloy billet of 8*300*280mm is kept at 480° C. for 3 hours for preheating.

[0054] b) The preheated billet is hot-rolled to a thickness of about 3mm after 3 fires, and the reductions per fire (that is, the deformation per fire) are respectively 25%, 33.3% and 25%; each fire is rolled 4 times , during the rolling process, the rolling direction and the vertical direction are continuously reversed and rolled, the rolling speed is 12m / min, the roll temperature is 220°C, and the fire insulation is kept at 480°C for 25min. The 3mm-thick plate was kept at 480°C for 2h for the first intermediate annealing. After the first annealing time is up, it is hot-rolled to a thickness of about 1mm after 3 fires, and the reductions are 30%, 28.6% and 33.3% respectively; the rolling speed is 14m / min, the temperature of the roll is 200°C, and the fire insulation is at 480°C Keep warm for 20min. The 1.5mm t...

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Abstract

The invention provides a manufacturing method for a high-strength heat-resistant magnesium alloy sheet. The manufacturing method comprises the following steps of: S1) hot rolling, specifically, conducting hot rolling treatment on a blank to obtain a sheet material with a thickness of b1; S2) conducting solution treatment on the sheet material obtained in the step S1); S3) conducting cold rolling treatment on the sheet material subjected to solution treatment to form a sheet material with a target thickness b0; and S4) conducting aging treatment on the cold-rolled sheet material, wherein a blank is an Mg-Gd-Y series alloy, and b1=b0 / [1-(2%-8%)]. By using the manufacturing method disclosed by the invention, hot rolling is firstly conducted, and then large-deformation machining is conducted, so that the production efficiency of the sheet material is improved; alloy elements are fully dissolved into a matrix through solution treatment, so that the plasticity of the material is improved, and the subsequent cold rolling performance and the final mechanical properties of the material are improved; warping of the sheet material after solid solution can be improved through cold rolling, and grains can be refined with cold deformation so as to improve the mechanical properties of the sheet material; and the cold-rolled sheet material can be annealed with aging treatment, so that the microstructure of the sheet material is improved, the deformation stress is eliminated, and the comprehensive performance is improved.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy materials, in particular to a high-strength heat-resistant magnesium alloy thin plate and a preparation method thereof. Background technique [0002] Magnesium alloys have the advantages of low density, high specific strength / specific stiffness, and good machinability, and are widely used in aerospace, national defense, aerospace and other fields. However, conventional magnesium alloys have low high-temperature strength, which limits their application in some high-strength and heat-resistant environments. Studies have found that adding appropriate rare earth elements such as Gd, Y, and Sm to magnesium alloys can significantly improve the high-temperature strength of the alloy and meet the requirements of high-strength and heat-resistant products. However, due to the large surface tension of rare earth elements, especially heavy rare earth elements such as Gd and Y, large internal stresses...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22F1/06C21D9/46B21B1/40B21B3/00B21B37/28B21B37/74
CPCC22C23/06C22F1/06C21D9/46C22F1/002B21B1/40B21B3/00B21B37/28B21B37/74
Inventor 刘海平王明跃陈洋清肖宏超熊雯瑛曾钢
Owner CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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