Method and device for processing metal materials with cryogenic laser shock

A technology of laser shock strengthening and metal materials, applied in the fields of laser processing and cold treatment, it can solve the problems of inability to solve the toughness characteristics of materials, uneven distribution of residual compressive stress, and inability to significantly improve the toughness of materials, so as to improve the stability and various Mechanical properties, effect of promoting transformation, preventing brittle failure

Active Publication Date: 2012-06-13
JIANGSU UNIV
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  • Abstract
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method and device capable of forming high-density nano-twins and nano-precipitates inside the metal material, to overcome the current laser shock strengthening at room temperature The strengthening effect of material technology is only limited to the surface layer of the material and cannot be applied to a lower temperature environment. Tensile stress is generated in the core of the material and the non-impact area, the distribution of residual compressive stress is uneven, and the strength and toughness of the material cannot be solved. Single cryogenic strengthening The treatment cannot be app

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  • Method and device for processing metal materials with cryogenic laser shock
  • Method and device for processing metal materials with cryogenic laser shock
  • Method and device for processing metal materials with cryogenic laser shock

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Room temperature laser impact enhanced zk60 magnesium alloy

[0038] Place ZK60 magnesium alloy 24 with a size of 10mm × 10mm × 5mm on the sample placement platform 26, start the computer system 18 issued instructions, control the movement of ND: YAG solid lasers 1 and CNC five -axis workbench, ND: YAG: YAG: YAGSolid laser 1 emits laser beam 2 through optical lens 3, and the effect of reflective 4 makes the laser beam 2 vertically illuminate to the K9 glass 23 for laser impact reinforcement.The overlap rate is 75%, with organic silica gel as the absorption layer 25 and K9 glass as the constraint layer 23.

[0039] After the corresponding instrument detection: the hardness increased from 105HV to 139HV, the yield strength increased from 198MPa to 269MPa, and the extension rate increased from 20.5%to 23.4%.The shock toughness is 28.4j.cm 3 Fall to 23,1 j.cm 3 The corrosion resistance has increased by 37%, and the abrasion resistance is increased by 57%.The metal material was ...

Embodiment 2

[0042] Deep cold laser shock strengthening ZK60 magnesium alloy

[0043] There are liquid nitrogen storage cavity 16 and sample placement platform 26 in the deep -cold treatment cavity 22, the deep -cold treatment cavity 22 will be placed on the five -axis workbench 17, the five -axis workbench 17 connects the computer system 18 through the wire;On the sample placement platform 26, there is a temperature sensor 21 in the deep cold treatment cavity 22, and the temperature sensor 21, A / D converter 20 and computer system 18 are connected with a wire;Device 19, micro heater 19 connects the electronic switch 27 with the computer system 18 through the wire; the liquid nitrogen tank 14 is connected to the liquid nitrogen storage cavity 16 with liquid nitrogen transportation tube 15, and 15There is a flow control valve 12 on the top; at the same time, the liquid nitrogen return pipe 11 is used to connect the liquid inlet of liquid nitrogen tank 23 with the nitrogen liquefied device 9, and...

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Abstract

A method and a device for processing metal materials with cryogenic laser shock belong to the fields of laser processing and subzero treatment. The device comprises a cryogenic treatment cavity, a laser, a liquid nitrogen tank, a temperature sensor and the like. The method is used for strengthening the materials in an ultra-low temperature environment by adopting the laser shock processing technology, insulating the materials for a period after the strengthening process, and heating the materials to be as hot as the ambient temperature. In the ultra-low temperature environment, the metal materials shrink, and a large quantity of dislocation is generated in the materials; due to the instant impact effect of the laser shock processing technology, the high-density dislocation in the materials moves at a high speed, so as to induce high-density nano twin crystal, which ensures that the materials have superior tenacity as well as high intensity, and brittle failure of the metal materials in the low-temperature environment can be avoided effectively; and a large quantity of nano educt is dissolved out from the materials, and the conversion of residual austenite as well as the thinning of martensite and crystal can be promoted effectively, which remarkably improves the mechanical properties and the mechanical properties of the materials.

Description

Technical field [0001] The present invention involves the field of cold treatment and laser processing, and especially refers to the application method and device of laser shocks to strengthen metal materials under ultra -low -temperature environments. Background technique [0002] With the continuous development of the economy, the demand for energy from all over the world has increased, and the consumption of oil and gas has grown rapidly. Related oil and natural gas exploration, drilling, transportation, processing and other industries have developed rapidly.Metal materials used in these industries basically need to be used in low-temperature environments (under -50 ° C), and ordinary metal materials will cause crispy damage in low temperature environments, such as steel, which requires that metal materials must be goodThe strong toughness characteristics.In order to improve the use of metal materials, various reinforcement methods have appeared. Traditional metal material enh...

Claims

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Application Information

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IPC IPC(8): C21D1/09C22F1/00
Inventor 周建忠谢小江黄舒陈寒松杨晶樊玉杰季杏露左立党安中伟
Owner JIANGSU UNIV
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