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A Composite Method for Forming Gradient Nanostructures by Laser-Assisted Mechanical Shot Peening

A mechanical shot peening and laser-assisted technology, which is applied in the direction of improving process efficiency, can solve the problems of metal workpiece material grain growth, waste of energy, and difficulty in heating metal workpieces, so as to improve surface strength, reduce consumables, and improve surface quality. quality effect

Active Publication Date: 2020-05-22
INST OF LASER & OPTOELECTRONICS INTELLIGENT MFG WENZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for large metal workpieces, heating the entire metal workpiece is difficult and wastes energy, and heating the metal workpiece during the entire long-term processing will cause the grains of the metal workpiece material to grow, which is counterproductive

Method used

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  • A Composite Method for Forming Gradient Nanostructures by Laser-Assisted Mechanical Shot Peening
  • A Composite Method for Forming Gradient Nanostructures by Laser-Assisted Mechanical Shot Peening
  • A Composite Method for Forming Gradient Nanostructures by Laser-Assisted Mechanical Shot Peening

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of example that uses above-mentioned method to prepare TC4 titanium alloy surface gradient nanostructure, its steps are:

[0029] (1) Two TC4 titanium alloy samples with a size of 15mm×15mm×5mm were selected for the comparative test, which were respectively denoted as sample 1 and sample 2, wherein sample 1 was a comparative sample.

[0030] (2) Grind and polish the upper surfaces of the two samples in step (1) with 400#, 600#, 800#, 1000#, 1200#, 1500# and 2000# sandpaper, and then use deionized water Ultrasonic cleaning, treatment area A such as figure 2 shown.

[0031] (3) Carry out mechanical shot peening treatment to sample 1 according to the zone A established in step (2), wherein the mechanical shot peening process parameters are as follows: the shot peening pressure is 0.4MPa, the steel shot diameter is 1mm, and the steel shot roughness is Ra 1.6, the scanning speed is 200mm / min, and the scanning path is bow-shaped.

[0032] (4) Laser-assisted mechani...

Embodiment 2

[0036] A kind of example that uses above-mentioned method to prepare AM50 magnesium alloy surface layer gradient nanostructure, its steps are:

[0037] (1) Two AM50 magnesium alloy samples with a size of 15mm×15mm×5mm were selected for the comparative test, which were designated as sample 3 and sample 4 respectively, wherein sample 3 was a comparative sample.

[0038](2) Grind and polish the upper surfaces of the two samples in step (1) with 400#, 600#, 800#, 1000#, 1200#, 1500# and 2000# sandpaper, and then use deionized water Ultrasonic cleaning, treatment area A such as figure 2 shown.

[0039] (3) Carry out mechanical shot peening treatment to sample 3 according to the area A established in step (2), wherein the mechanical shot peening process parameters are as follows: shot peening pressure is 0.2MPa, steel shot diameter is 1mm, and steel shot roughness is Ra 1.6, the scanning speed is 200mm / min, and the scanning path is bow-shaped.

[0040] (4) Laser-assisted mechani...

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Abstract

The invention relates to the technical fields of surface engineering and laser processing, in particular to a complex method for forming a gradient nanostructure by laser-assisted mechanical shot peening. A continuous laser beam is adopted to locally heat the surface of a metal workpiece to a dynamic recrystallization temperature range, and while the dynamic recrystallization temperature range iskept, the metal workpiece is strengthened in a large area by a mechanical peening process to obtain a deeper gradient nanostructure layer and better nanometer order-submicron order-micron order gradient structure layer on a surface layer of the metal workpiece.

Description

technical field [0001] The invention relates to the fields of surface engineering technology and laser processing technology, in particular to a composite method for forming gradient nanostructures by laser-assisted mechanical shot peening. Background technique [0002] Nano-metal materials have the advantages of high strength and hardness, good physical properties, wear properties and thermal processing properties. However, with the significant increase in strength and hardness, the plasticity and toughness of nanostructured materials are significantly reduced, the work hardening ability disappears, and the structural stability becomes poor. The above shortcomings restrict the application and development of nanostructured materials. With the development of high-strength and lightweight engineering structures, traditional homogeneous materials, such as coarse-grained materials and nano-crystalline materials, cannot meet the performance requirements of engineering structures ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D7/06C21D1/09
CPCC21D1/09C21D7/06C21D2221/10Y02P10/20
Inventor 薛遥吴刘军鲁金忠罗开玉薛伟
Owner INST OF LASER & OPTOELECTRONICS INTELLIGENT MFG WENZHOU UNIV