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Method for preparing gradient equiaxed crystals in zirconium alloys by laser surface treatment-rolling annealing composite process

A technology of laser surface treatment and composite technology, applied in the field of axial crystals, to achieve the effect of convenient operation, simple equipment, and enhanced bonding

Active Publication Date: 2020-11-24
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, the preparation of zirconium alloy materials with gradient equiaxed grain structure by laser surface treatment-rolling annealing composite process, and the related research on its microstructure and properties have not been reported yet.

Method used

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  • Method for preparing gradient equiaxed crystals in zirconium alloys by laser surface treatment-rolling annealing composite process
  • Method for preparing gradient equiaxed crystals in zirconium alloys by laser surface treatment-rolling annealing composite process
  • Method for preparing gradient equiaxed crystals in zirconium alloys by laser surface treatment-rolling annealing composite process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Select the prepared Zr702 sample of 18×12×2mm, first use 800#, 1000#, 1200#, 2000# and 3000# sandpaper to polish the sample until it is bright. After the sample was polished, it was cleaned with absolute ethanol, and finally its surface was dried. Then the sample was placed on the YAG laser workpiece table and fixed with iron clips. Then, the protective gas pipeline was fixed above the surface of the sample, and argon with a purity of 99.9% was used as the protective gas to ensure an argon atmosphere around the sample. Then set the laser parameters and set the laser beam path. Start the laser, load the voltage, turn on the argon gas, and perform laser surface treatment on the surface of the Zr702 sample. The process parameters of the laser surface treatment are: laser power 36W, scanning speed 6mm s -1 , defocus amount 0mm, peak value 1KW, pulse width 6m s, frequency 6HZ, power density 45.85W mm -2 , energy density 7.5W·s·mm -1 . Finally, take out the sample after ...

Embodiment 2

[0030]Select the prepared Zr702 sample of 18×12×2mm, first use 800#, 1000#, 1200#, 2000# and 3000# sandpaper to polish the sample until it is bright. After the sample was polished, it was cleaned with absolute ethanol, and finally its surface was dried. Then the sample was placed on the YAG laser workpiece table and fixed with iron clips. Then, the protective gas pipeline was fixed above the surface of the sample, and argon with a purity of 99.9% was used as the protective gas to ensure an argon atmosphere around the sample. Then set the laser parameters and set the laser beam path. Start the laser, load the voltage, turn on the argon gas, and perform laser surface treatment on the surface of the Zr702 material. The process parameters of the laser surface treatment are: laser power 36W, scanning speed 6mm s -1 , defocus amount 0mm, peak value 1KW, pulse width 6m s, frequency 6HZ, power density 45.85W mm -2 , energy density 7.5W·s·mm -1 . Finally, the sample was taken out ...

Embodiment 3

[0034] Select the prepared Zr702 sample of 18×12×2mm, first use 800#, 1000#, 1200#, 2000# and 3000# sandpaper to polish the sample until it is bright. After the sample was polished, it was cleaned with absolute ethanol, and finally its surface was dried. Then the sample was placed on the YAG laser workpiece table and fixed with iron clips. Then, the protective gas pipeline was fixed above the surface of the sample, and argon with a purity of 99.9% was used as the protective gas to ensure an argon atmosphere around the sample. Then set the laser parameters and set the laser beam path. Start the laser, load the voltage, turn on the argon gas, and perform laser surface treatment on the surface of the Zr702 material. The process parameters of the laser surface treatment are: laser power 100W, scanning speed 8mm s -1 , Defocus amount +2mm, peak value 1KW, pulse width 5m s, frequency 20HZ, power density 127.4W mm -2 , Energy density 12.5W·s·mm -1 . Finally, the sample was taken...

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Abstract

The invention provides a method for preparing gradient isometric crystals in a zirconium alloy through a laser surface treatment and rolling annealing composite process. The method comprises the following steps: (1) a workpiece is prepared, specifically, the pure-zirconium alloy workpiece is polished to be bright with sandpaper, cleaned and dried; (2) laser surface treatment is conducted on the workpiece, specifically, laser surface treatment is conducted on the obverse side and the reverse side of the dried zirconium alloy workpiece, and argon is adopted as shielding gas; and (3) an isometriccrystal structure on the surface of the workpiece is prepared, specifically, firstly, the workpiece subjected to laser surface treatment is subjected to multi-pass rolling treatment at the room temperature, and then annealing treatment is conducted after the rolled workpiece is polished to be bright with sandpaper, cleaned and dried. According to the method for preparing the gradient isometric crystal structure, an obvious interface between a modified area and a matrix after laser treatment is eliminated, thus the surface performance of a pure-zirconium material is improved, and the method has the characteristics of convenient operation, simple equipment, economical efficiency and practicability, reliable technology, stable quality and the like.

Description

technical field [0001] The invention belongs to the field of surface treatment of metal processing, and in particular relates to a method for preparing gradient equiaxed crystals in zirconium alloys through a laser surface treatment-rolling annealing composite process. Background technique [0002] Zirconium and its alloys have the advantages of small neutron absorption cross-section, strong corrosion resistance and excellent biocompatibility, and have important structural applications in the fields of nuclear industry, chemical industry and biomedicine. However, surface failure due to nodules / pitting and fretting wear is a significant engineering issue for its application. With the increasing use of pure zirconium materials in industry, higher requirements are put forward for the performance of pure zirconium materials, including wear resistance, corrosion resistance, biocompatibility, etc., so it is necessary to further improve the performance of pure zirconium materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F3/00C22F1/18
CPCC22F1/002C22F1/186C22F3/00
Inventor 柴林江朱宇凡胡兴吴璐夏吉莺汤帆顺麻彦龙罗怡张弛代兵
Owner CHONGQING UNIV OF TECH
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