Effects of laser shock processing on θ-Al2O3 to α-Al2O3 transformation and oxide scale morphology evolution in (γ’+β) two-phase Ni-34Al-0.1Dy alloys

A plasma sound wave detection method of laser shock processing (LSP) technology is proposed. Speciments of Ni-base superalloy are used in this paper. A convergent lens is used to deliver 1.2 J, 10 ns laser pulses by a Q-switch Nd:YAG laser, operating at 1 Hz. The influence of the laser density to the shock wave is investigated in detail for two different wavelength lasers. Constant amplitude fatigue data are generated in room environment using notch specimens tested at an amplitude of vibration 2.8 mm and first-order flextensional mode. The results show that LSP is an effective surface treatment technique for improving the high cycle fatigue performance of Ni-base superalloys having a factor of 1.62 improvement in fatigue life.

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Forced vibration analysis of blade after selective laser shock processing based on Timoshenko’s beam theory

Composite Structures ◽

10.1016/j.compstruct.2020.112249 ◽

2020 ◽

Vol 243 ◽

pp. 112249 ◽

Cited By ~ 1

Author(s):

Peilin Fu ◽

Jianghong Yuan ◽

Xu Zhang ◽

Guozheng Kang ◽

Ping Wang ◽

...

Keyword(s):

Forced Vibration ◽

Vibration Analysis ◽

Beam Theory ◽

Laser Shock ◽

Laser Shock Processing ◽

Forced Vibration Analysis ◽

Shock Processing

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Influence of Laser Shock Processing on the Weld Line and Finite Element Simulation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.464.627 ◽

2011 ◽

Vol 464 ◽

pp. 627-631

Author(s):

Jie Zhang ◽

Ai Hua Sun ◽

Le Zhu ◽

Xiang Gu

Keyword(s):

Residual Stress ◽

Finite Element ◽

Welding Residual Stress ◽

Laser Shock ◽

Analysis Software ◽

Laser Shock Processing ◽

Element Analysis ◽

Welding Line ◽

Simulation Results ◽

Shock Processing

Welding residual stress is one of the main factors that affect the strength and life of components. In order to explore the effect on residual stress of welding line by laser shock processing, finite element analysis software ANSYS is used to simulate the welding process, to calculate the distribution of welding residual stress field. On this basis, then AYSYS/LS-DYNA is used to simulate the laser shock processing on welding line. Simulation results show that residual stress distributions of weld region, heat-affected region and matrix by laser shock processing are clearly improved, and the tensile stress of weld region effectively reduce or eliminate. The simulation results and experimental results are generally consistent, it offer reasons for parameter optimization of welding and laser shock processing by finite element analysis software.

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High Dense Compressive Residual Stress Produced in Laser Shock Processing on Ti6Al4V Alloys

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.353-358.1617 ◽

2007 ◽

Vol 353-358 ◽

pp. 1617-1620 ◽

Cited By ~ 1

Author(s):

Xu Dong Ren ◽

Yong Kang Zhang ◽

Jian Zhong Zhou ◽

Yong Yu Gu ◽

Y.Y. Xu ◽

...

Keyword(s):

Residual Stress ◽

Fatigue Crack ◽

Surface Stress ◽

Compressive Residual Stress ◽

High Energy ◽

Laser Shock ◽

Laser Shock Processing ◽

Large Spot ◽

Small Spot ◽

Shock Processing

Laser shock processing (LSP) employs high-energy laser pulses from a solid-state laser system to create intense shock waves into a material, which can induce compressive residual stresses in the target surface and improve its mechanical property efficiency. Residual stress of Ti6Al4V alloy both before and after LSP with multishocks was analysised. The depth of compressive residual stress was found to have a dependence on the number of shocking layers and a slight dependence on the level of irradiance. Surface stress improvements of more than 50% increases are possible after laser shock processing with either large spot or small spot patterns. The large spot gave a surface stress of 432MPa and a depth of over 1mm. The low intensity small spot gave a surface stress of 285MPa with a depth comparable to the large spot. Laser shock processing induces a compressive residual stress field, which increases fatigue crack initiation life and reduces fatigue crack growth rate.

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