Experimental Study on Residual Stress of K24 Superalloy in Laser Cladding Zone by Laser Shock Processing

The surface of K24 superalloy was processed with laser cladding & LSP (laser shock processing). Residual stress in the laser cladding zone by LSP was measured with X-ray stress tester X-350A, and the variational rule of residual stress in the cladding zone by tempering treatment of 8 hours and 16 hours was measured, respectively. The experimental results show that compressive residual stress of K24 superalloy surface by laser cladding & laser shock processing is above -600MPa, which exceeds residual stress by mechanical peening treatment; and there is no clear effect on residual stress by tempering treatment at 600°C for 8 hours and 16 hours, respectively, which can improve fatigue life of K24 superalloy.

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Experimental Study of Residual Stress Formation Mechanism of 7050 Aluminum Alloy Sheet by Laser Shock Processing

Chinese Journal of Lasers ◽

10.3788/cjl201643.0702008 ◽

2016 ◽

Vol 43 (7) ◽

pp. 0702008

Author(s):

曹宇鹏 Cao Yupeng ◽

徐影 Xu Ying ◽

冯爱新 Feng Aixin ◽

花国然 Hua Guoran ◽

周东呈 Zhou Dongcheng ◽

...

Keyword(s):

Residual Stress ◽

Experimental Study ◽

Aluminum Alloy ◽

Alloy Sheet ◽

Laser Shock ◽

Aluminum Alloy Sheet ◽

Laser Shock Processing ◽

7050 Aluminum Alloy ◽

Stress Formation ◽

Shock Processing

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Prediction of residual stress induced by laser shock processing based on artificial neural networks for FGH4095 superalloy

Materials Letters ◽

10.1016/j.matlet.2020.129269 ◽

2021 ◽

Vol 286 ◽

pp. 129269

Author(s):

Jiajun Wu ◽

Yinghao Li ◽

Jibin Zhao ◽

Hongchao Qiao ◽

Ying Lu ◽

...

Keyword(s):

Neural Networks ◽

Residual Stress ◽

Artificial Neural Networks ◽

Laser Shock ◽

Laser Shock Processing ◽

Artificial Neural ◽

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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Effect of 7050 Aluminium Alloy Microstructure on Residual Stress by Laser Shock Processing

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.463-464.1363 ◽

2012 ◽

Vol 463-464 ◽

pp. 1363-1367

Author(s):

M.L. Zhang ◽

J.M. Wang ◽

Y.F. Jiang ◽

Q.L. Zhang ◽

Q.L. Zhou

Keyword(s):

Residual Stress ◽

Aluminium Alloy ◽

Compressive Stress ◽

Solution Treatment ◽

Aging Treatment ◽

Residual Compressive Stress ◽

Original Structure ◽

Laser Shock ◽

Laser Shock Processing ◽

Shock Processing

The solution treatment and solution and aging treatment (T6) were disposed on 7050 aluminium alloy, then local processed by laser shock processing (LSP) with high-rate neodymium glass laser. The microhardness and residual stress on the surface of 7050 aluminium alloy were tested, then how the microstructure influences the residual stress on the surface of 7050 aluminium alloy by laser shock processing was analysed. The results show that the microhardness and residual compressive stress on the surface of 7050 aluminium alloy treated by solution and aging treatment was higher, and decreased obviously treated by solution treatment; the microhardness and residual compressive stress on the surface of 7050 aluminium alloy increased obviously by solution treatment and solution and aging treatment after laser shock processing; treated by solution treatment and solution and aging treatment, the microhardness and residual compressive stress of the material with uniform original structure was higher than the material with nonuniform original structure.

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