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Surface strengthening method for metal component by vibration-assisted laser shock treatment

A metal component and impact treatment technology, which is applied in the field of metal surface strengthening treatment and surface strengthening layer, can solve the problems of inability to achieve strengthening effect and the influence of material surface roughness, etc., to prevent initiation and expansion, improve mechanical properties, The effect of improving fatigue life

Active Publication Date: 2018-10-16
JIANGSU UNIV
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AI Technical Summary

Problems solved by technology

Although shot peening can induce a large residual compressive stress on the surface of the material, it has a greater impact on the surface roughness of the material, and the residual compressive stress layer produced by rolling is relatively shallow, which cannot achieve a good strengthening effect

Method used

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  • Surface strengthening method for metal component by vibration-assisted laser shock treatment

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Embodiment Construction

[0022] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] The sample base material used in this embodiment is 304 stainless steel, and its geometric size is 60mm×30mm×10mm.

[0024] A kind of example using above-mentioned strengthening method processing sample, its steps are:

[0025] (1) After the metallographic sandpaper is used to grind the sample to be treated step by step, put it in an alcohol solution and use an ultrasonic cleaner to remove dust and oil stains on the surface;

[0026] (2) The vibrator 3 is fixed on the 304 stainless steel sample 1 to be processed, and the vibrator 3 is connected to the controller 7 through the motor cable 4;

[0027] (3) sensor 5 is placed on the surface of the 304 stainless steel sample, fixed on the sample by the magnet at its bottom, sensor 5 is connected to the controller 7 by shielded cable 6;

[0028] (4) Instal...

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Abstract

The invention relates to the field of new techniques of laser processing and vibration aging, in particular to a surface strengthening method for a metal component by vibration-assisted laser shock treatment. According to the method, by combining laser shock strengthening technology with vibration aging treatment, a vibration exciter is used to excite vibration, a sensor picks up vibration, the vibration frequency is controlled to keep the amplitude value within a specified range, laser lap impact strengthening treatment is carried out with the aid of vibration aging treatment so that more serious plastic deformation can be generated on the surface of the metal component, and high-amplitude residual compressive stress is induced in an impact area; meanwhile under the condition that laser beam irradiates the metal surface, vibration further refines or even nanocrystallizes the surface grain, and under the action of the temperature field, vibration reduces the thermal stress field gradient, and thus the residual stress inside the material is uniformized; and the mechanical properties of the metal component are remarkably improved, and the metal surface is strengthened, so that the fatigue life of the metal component is prolonged effectively, and initiation and expansion of fatigue cracks are prevented.

Description

technical field [0001] The invention relates to the new technology field of laser processing and vibration aging, in particular to a method of laser shock strengthening on a region to be strengthened on a metal surface under an auxiliary field of vibration aging to obtain a fatigue-resistant surface strengthening layer. This method is suitable for strengthening treatment of metal surface. Background technique [0002] Most of the industrial parts are made of metal materials. Metal alloy parts are prone to cracks due to wear, impact, fatigue and other effects during work, resulting in scrapped materials. With the rapid development of my country's industry, higher requirements are put forward for the workpiece industry. How to improve the processing quality and service life of workpieces has always been a subject of continuous exploration. At present, surface strengthening technology is gradually becoming an important way to improve the quality and service life of workpieces....

Claims

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Application Information

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IPC IPC(8): C21D10/00
CPCC21D10/00C21D10/005
Inventor 罗开玉王长雨鲁金忠尹叶芳
Owner JIANGSU UNIV
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