Ultrasonic rolling recombination laser remelting method for improving fatigue property of welded joint

A technology of laser remelting and welding joints, applied in the field of surface strengthening and material processing, it can solve the problems of low bonding strength between the surface coating and the substrate, the fatigue performance does not play a fundamental role, and the fatigue performance of the material is reduced. Increased stress, improved surface texture, enhanced effect of texture improvement

Inactive Publication Date: 2017-01-04
JILIN UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The strengthened surface obtained by these methods is not very practical in the field of improving fatigue performance due to the low bonding strength between the surface coating and the substrate, and cracks are prone to occur at the joint.
At the same time, some of the above methods do not perform surface plastic deformation processing after thermal cycling, so there are no nanocrystals and residual compressive stress on the strengthened surface, which does not play a fundamental role in improving fatigue performance, and will also reduce Fatigue Properties of Materials
In addition, some methods have great hidden dangers in terms of operational security
[0004] Existing surface strengthening technologies only focus on the individual processing methods, effects and performance improvements of ultrasonic surface rolling and laser remelting, and there are few reports on the combination of the two.

Method used

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  • Ultrasonic rolling recombination laser remelting method for improving fatigue property of welded joint
  • Ultrasonic rolling recombination laser remelting method for improving fatigue property of welded joint
  • Ultrasonic rolling recombination laser remelting method for improving fatigue property of welded joint

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Effect test

Embodiment 1

[0056] Based on the AZ31B magnesium alloy, ultrasonic rolling combined laser remelting treatment was carried out. AZ31B magnesium alloy size form see Figure 5 , the morphology of the magnesium alloy sample before and after the composite method is as follows Figure 6 shown. Among them, the parameters used in laser processing are: power: 1.1KW; scanning speed: 600mm / min; spot diameter: 3mm; argon gas protection; protection gas flow rate: 15L / min. The processing parameters of ultrasonic rolling are: the impact ball adopts Cr15 steel ball with a diameter of 15 mm; during processing, the magnesium alloy sample is clamped on the chuck 4 of the CNC machine tool, and the ultrasonic rolling device 10 is fixed on the turret of the machine tool instead of the lathe. Knife position, the specific processing parameters are: speed: 250r / min; feed speed: 10mm / min; static pressure: 200N; frequency: 20KHz; processing times: reciprocating three times; coolant: wire cutting cooling milk. The...

Embodiment 2

[0058] The samples before and after strengthening of above-mentioned embodiment 1 are carried out fatigue test, fatigue S-N curve is as follows Figure 8 shown. It can be seen that the fatigue life of the magnesium alloy strengthened by the composite method has been greatly improved, corresponding to 10 7 Under the cycle times, the fatigue performance is improved by more than 20%.

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Abstract

The invention relates to an ultrasonic rolling recombination laser remelting method for improving the fatigue property of a welded joint, and belongs to the field of material processing and surface strengthening. The method comprises the following steps: first, the surface modification of the welded joint is performed according to the laser remelting technology, and then ultrasonic surface rolling treatment is performed. Compared with a pure ultrasonic surface rolling processing method, the ultrasonic rolling recombination laser remelting method has the advantages that not only can surface nanocrystallization and ultra-low roughness of the welded joint be realized, but also the welded joint structure can be improved, welding defects can be eliminated, and the depth of a modified surface layer can be deepened, so that the fatigue strength of the welded joint is greatly improved.

Description

technical field [0001] The invention relates to the fields of material processing and surface strengthening, in particular to an ultrasonic rolling composite laser remelting method for improving the fatigue performance of welded joints. Background technique [0002] As a continuation technology of ultrasonic shock, ultrasonic surface rolling is a simple and reliable post-weld treatment technology that greatly improves the fatigue life of welded joints. In recent years, it has been widely concerned and applied in popular research fields such as fatigue life extension and surface modification. Ultrasonic surface rolling technology can prepare nanocrystals on the surface of welded joints, while introducing residual compressive stress and significantly reducing surface roughness. However, due to the relatively low strength of some materials (such as magnesium alloys and aluminum alloys), the residual compressive stress formed on the material surface by ultrasonic surface rolling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C21D7/04C22F1/00
CPCC23C24/10C21D7/04C22F1/00
Inventor 赵小辉彭志刚刘宇赵博张艳君薛桂莲
Owner JILIN UNIV
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