Thin-wall metal mechanical property changing method

A metal and mechanical technology, applied in the field of changing the mechanical properties of thin-walled metals, can solve problems such as difficult application of metal parts

Active Publication Date: 2022-04-12
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to apply to metal parts with a small thickness, especially metal parts with a thickness of less than 1mm

Method used

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  • Thin-wall metal mechanical property changing method

Examples

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Effect test

Embodiment

[0056] In order to quickly verify the effect of the ultrafast laser shock of the present invention on improving the fatigue resistance of metal materials (metal films), the present invention casts aluminum alloy specimens through ultrafast laser shock 7075 and tests related mechanical parameters to directly obtain the effect of ultrafast laser shock on 7075 The influence of the mechanical properties of the cast aluminum alloy specimens is used to verify the potential application prospect of ultrafast laser shock on the fatigue resistance of metals.

[0057] In this example, the effects of using aluminum foil as a sacrificial layer and direct laser irradiation on the mechanical properties of a cast aluminum alloy with a thickness of 0.25mm and 1mm will be investigated.

[0058] Ultrafast laser parameters:

[0059] Laser wavelength 1030nm; pulse width 290fs; single pulse energy 50μJ; pulse frequency 2kHz; spot diameter 60μm.

[0060] Spot overlapping method see image 3 shown....

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Abstract

The invention discloses a thin-wall metal mechanical property changing method which comprises the following steps: step 1, fitting and assembling a workpiece and a workpiece substrate, and fixing the workpiece and the workpiece substrate on a precise moving table; 2, planning a light spot path according to the surface appearance of the workpiece; and thirdly, the power density of laser is GW/cm < 2 > magnitude, the spot diameter of the laser is micron magnitude, the pulse width of the laser is femtosecond magnitude, the surface of the workpiece is impacted by the laser, the interior of the workpiece is modified through explosive shock waves, the spot is controlled to move along the spot path, and the spot coverage rate of the surface of the workpiece is made to be 300% or above. Femtosecond laser is adopted to modify thin-wall metal, the total amount of generated plasmas is smaller, the peak pressure of shock waves is higher, acting force time is shorter, and generated impact force, namely impact momentum is smaller, so that the thin-wall metal material generates dynamic yield response to generate microstructure change and a pre-stress field, but bending deformation is not prone to occurring; the purpose of changing the mechanical property of the thin-wall metal part is achieved.

Description

technical field [0001] The invention relates to the technical field of material modification, in particular to a method for changing the mechanical properties of thin-walled metals, which uses a femtosecond laser (ultrafast laser, ultra-high power laser) to change the mechanical properties of thin-walled metal materials. Background technique [0002] Metal components will bear tension and cyclic force during service, and when the external load exceeds the bearing limit (yield strength, tensile strength) of the material, component fracture failure will occur; when subjected to cyclic load, the external load does not need to reach Bearing limit, at higher cycles (>10 5 ) Under cyclic loading, fracture will also occur, which is called high cycle fatigue fracture failure. In order to enhance the mechanical properties of the above-mentioned fracture resistance of metal components, according to the knowledge of metallurgy and mechanics, methods of changing the microstructure o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D10/00C22F3/00
CPCY02P10/25C22F3/00C21D10/00
Inventor 侯志伟于新海涂善东潘嘉裕庄鹏朱维平钱旭红
Owner EAST CHINA UNIV OF SCI & TECH
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