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

2007 ◽  
Vol 353-358 ◽  
pp. 453-456
Author(s):  
Jin Zhon Lu ◽  
Yong Kang Zhang ◽  
Y.Y. Xu ◽  
De Jun Kong ◽  
H.B. Yao ◽  
...  
Keyword(s):  
Residual Stress ◽  
Experimental Study ◽  
Laser Cladding ◽  
Compressive Residual Stress ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
X Ray ◽  
Tempering Treatment ◽  
Shock Processing ◽  
Improve Fatigue

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.

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

2007 ◽  
Vol 353-358 ◽  
pp. 1617-1620 ◽  
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.

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

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

Experiment and Simulation of TC4 Alloy Rods Subject to Laser Shock Processing

2011 ◽  
Vol 189-193 ◽  
pp. 3709-3712
Author(s):  
Rui Fang Chen ◽  
Yu Xiao Chen ◽  
Yin Qun Hua
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Longitudinal Direction ◽  
Residual Stress Distribution ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
X Ray ◽  
Depth Direction ◽  
Tc4 Alloy ◽  
Shock Processing

In order to improve the fatigue strength of TC4, Nd:Glass pulse laser was used to impact the surface of cylindrical specimens, X-ray stress analyzer was used to test the residual stress distribution of treated area, the laser shock processing on different ratio (η) between the diameter of specimens and laser spot were simulated with ANSYS at the same time. The numerical simulation results were well agreement with experimental data. The results indicate that the different η mainly affect residual stress distribution along the circumferential direction. Contrarily, it has few effects on longitudinal direction and in-depth direction.

Study on residual stress of AISI304 TIG welding line with laser shock processing by x-ray stress analyzer

2006 ◽  
Author(s):  
Y. K. Zhang ◽  
D. J. Kong ◽  
S. M. Yin ◽  
A. X. Feng ◽  
J. Z. Lu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Tig Welding ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
X Ray ◽  
Welding Line ◽  
Shock Processing

Application of High-Energy Laser in Strain-Hardening of Material

2013 ◽  
Vol 321-324 ◽  
pp. 141-145
Author(s):  
Zhi Lin Lai ◽  
Cheng Wang ◽  
Wei Feng He ◽  
Liu Cheng Zhou ◽  
Zhi Bin An
Keyword(s):  
Residual Stress ◽  
Surface Hardening ◽  
Compressive Residual Stress ◽  
Processing System ◽  
High Energy ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Energy Laser ◽  
High Energy Laser ◽  
Shock Processing

Laser is a coherent, convergent and monochromatic beam of electromagnetic radiation and has wide applications in all walks of life. Surface engineering is one of the applications and contains surface alloying/cladding, surface melting/remelting, surface amorphization and surface hardening/shocking. Laser surface hardening/shocking has been proposed as an effective technology for improving surface mechanical and corrosion properties of metals by inducing a compressive residual stress field. The laser shock processing system with high-energy laser is the key technology for industrial application of surface shocking. The laser shock processing system was described in this paper and the power supply system and the samples gripping and handling system were also introduced. Experiment was conducted by the shock processing system and results shows that high-energy laser has led to compressive residual stress in near-surface regions of 1Cr11Ni2W2MoV stainless steel and improved 1Cr11Ni2W2MoV fatigue life greatly.

Strengthen Experimental Study of High Strength Steel 40CrNi2Si2MoVA Based on Laser Shock Processing

2013 ◽  
Vol 774-776 ◽  
pp. 1122-1126
Author(s):  
Yong Hua Wu
Keyword(s):  
Residual Stress ◽  
High Strength Steel ◽  
Compressive Residual Stress ◽  
High Strength ◽  
High Fracture Toughness ◽  
Laser Shock ◽  
High Fracture ◽  
Laser Shock Processing ◽  
Testing Specimen ◽  
Shock Processing

40CrNi2Si2MoVA high-strength steel is widely used in aircraft industry because of its unique combination of ultrahigh strength with high fracture toughness. However, 40CrNi2Si2MoVA is vulnerable to both corrosion fatigue and stress corrosion cracking failures with catastrophic consequences for aircraft. The high strength steel 40CrNi2Si2MoVA is enhanced and strengthen by usage of laser shock processing (LSP) with a optimal shock processing parameters, and after a series of comparion experiment in different overlap rate,the surface compressive residual stress in the testing specimen is measured and compared, and the experiment results show that the specimen surface has-962MPa compressive residual stress. Finally, the enhanced effect of compressive residual stress in surface of specimen by laser shock is discussed. The results of laser shock processing has a guiding significance to the engineering applications of high strength steel.

Application of Laser Shock Processing to Improving the Fatigue Performance of Compressor Blade

2010 ◽  
Vol 135 ◽  
pp. 184-189
Author(s):  
Qi Peng Li ◽  
Ying Hong Li ◽  
Wei Feng He ◽  
Wei Li ◽  
Yu Qin Li
Keyword(s):  
Residual Stress ◽  
Compressive Residual Stress ◽  
Strengthening Mechanism ◽  
Compressor Blade ◽  
Fatigue Performance ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Vibration Strength ◽  
Vibration Fatigue ◽  
Shock Processing

The vibration strength under allowable value leads to the failure of compressor blade of certain aeroengine. In order to solve the problem, laser shock processing on blade was studied. First, the processed part of blade as well as the laser shock processing (LSP) parameters was established. Second, the influence of LSP and tumbling to the vibrate fatigue capability of blades were researched according to the application of the project. Third, the strengthening mechanism of LSP on improving the fatigue performance of the blade was studied. The results show that, LSP is consistently dependable and can prolong the vibration fatigue life of the blade efficiently. LSP can be placed after tumbling or directly replace it during the manufacturing of blade. The grain refinement, higher hardness and compressive residual stress are the three main reasons that enhance the fatigue capability of blade.

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