Reduction of pulsed-laser surface irradiation induced residual stress using ultrasonic vibration method

Gu, Bobo; Jin, Zi-di; Dejun, Kong; Lai, Jintao; Yang, Zhensheng; Pan, Long

doi:10.1007/s00170-016-8798-7

Cited by 18 publications

(7 citation statements)

References 23 publications

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“…Therefore, after a 3% tensile treatment, the dislocation distribution in the GH4169 alloy tended to be uniform as a whole, and the residual stress in the superalloy was relaxed. When the tensile deformation was greater than 3%, the external force loaded in the alloy continued to increase, and the effect of reducing the residual stress was weakened when the external stress was too high [ 17 , 27 ].…”

Section: Discussionmentioning

confidence: 99%

Effect of Tensile Deformation on Residual Stress of GH4169 Alloy

et al. 2021

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In order to reduce the residual stress of the GH4169 alloy, the effect and micro-mechanism of the tensile deformation were studied. The residual stress, dislocation density, and distribution of the GH4169 alloy were analyzed by X-ray residual stress tester, X-ray diffractometer (XRD), and electron backscatter diffraction (EBSD). The results show that: with the increase of tensile deformation, the residual stress relief first increases and then decreases. When the tensile deformation is 3%, the reduction rate of residual stress reaches the maximum, which is 90%. The mechanism of residual stress relief by the tensile treatment is that the dislocation group in the alloy is activated by tensile treatment, and the dislocation distribution in the alloy is more uniform by dislocation movement, multiplication, and annihilation so that the residual stress can be eliminated.

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Section: Discussionmentioning

confidence: 99%

Effect of Tensile Deformation on Residual Stress of GH4169 Alloy

et al. 2021

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“…Persistent residual oscillations after UIT could lead to the numerical instability of residual stress field. The introduction of Rayleigh damping consisting of mass proportional damping and stiffness proportional damping is used to achieve energy dissipation, and the principle formula are shown as Equations (13) and (14) [31,32]:…”

Section: Simulation Of Uitmentioning

confidence: 99%

“…There are many post-weld methods mature in decreasing the welding residual stress, such as post-weld heat treatment [6], shot peening [7], post-weld rolling methods [8], water jet peening [9], etc. Some methods that are used before and during welding can also play an important role in decreasing welding residual stress, such as using proper groove distances [10], welding with low transformation temperature consumables [11], a preheating process [2], ultrasonic vibration [12][13][14], etc. However, compared with the above treatments, ultrasonic impact treatment (UIT) has superiority in reducing residual stresses and improving fatigue strength.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulation to Study the Reduction of Welding Residual Stress by Ultrasonic Impact Treatment

et al. 2020

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In this study, the effects of ultrasonic impact treatment (UIT) on the residual stress in a repair welding joint are investigated by experimental and finite element methods. A three-dimensional numerical analysis approach including a thermomechanical-coupled welding simulation and dynamic elastic-plastic UIT simulation is developed, which has been validated by X-ray diffraction measurement and indentation strain method. The results show that longitudinal residual stresses basically turned into the small tensile stress state from the large tensile stress state, and transverse residual stresses have mainly turned into compressive stresses from large tensile stress after the UIT. In the thickness direction, the average decrease of longitudinal residual stress is 259.9 MPa, which is larger than the 149.1 MPa of transverse residual stress. The calculated residual stress distribution after the UIT of the thin plate is compared with that of the thick plate in the literature, with the results showing the stress accumulation layer inside the thick plate. The simulation results show that the elastic strains are decreased slightly and the equivalent plastic strain is increased markedly after UIT, which explains the mechanism of residual stress relaxation.

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“…Therefore, some stress relief processes can be taken to homogenize the internal residual stress of parts, and the commonly used technologies include thermal stress relief (TSR), vibratory stress relief (VSR), thermal and vibratory stress relief (TVSR), ultrasonic vibration, mechanical deformation method, etc. Gu et al [23] established a unified ultrasonic vibration plasticity framework and revealed the mechanism of the ultrasonic stress relief, which has an important significance in ultrasonic stress homogenization. Gao et al [24] investigated the effect of VSR on residual stress and fatigue life of Ti6Al4V part.…”

Section: Introductionmentioning

confidence: 99%

Effects of residual stress and equivalent bending stiffness on the dimensional stability of the thin-walled parts

Gao

Lin

et al. 2022

Int J Adv Manuf Technol

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The monolithic thin-walled parts are widely used in the aeronautic and astronautic field because of its excellent mechanical performance and light weight, but the thin-walled parts are vulnerable to the machining deformation due to its low stiffness and high material removal rate.According to the relative basic theory, the stiffness and internal residual stress of the part are the critical factors affecting the dimensional stability. In this work, the influences of equivalent bending stiffness and residual stress on the dimensional stability of thin-walled parts are studied.Nine typical thin-walled parts in three groups with two materials (7075 aluminum alloy for A1~A3 and B1~B3, and Ti6Al4V titanium alloy for B4~B6) are machined and treated with different processes. Topology optimization technique is used to optimize the structure of parts to enhance the bending stiffness. Corresponding finite element method (FEM) simulations are carried out to further investigate the generation mechanism. The deformations in 312 hours after machining are measured using coordinate measuring machine, and the deformation changes of the parts are obtained and analyzed. Finally, based on topological optimization and 2 stress relief technology, a machining deformation control method for the monolithic thin-walled parts is proposed. Results show that the maximum and average deformations of thin-walled are evidently decreased using the proposed method.

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Reduction of pulsed-laser surface irradiation induced residual stress using ultrasonic vibration method

Cited by 18 publications

References 23 publications

Effect of Tensile Deformation on Residual Stress of GH4169 Alloy

Effect of Tensile Deformation on Residual Stress of GH4169 Alloy

Experimental and Numerical Simulation to Study the Reduction of Welding Residual Stress by Ultrasonic Impact Treatment

Effects of residual stress and equivalent bending stiffness on the dimensional stability of the thin-walled parts

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