scholarly journals Impact on Mechanical Properties and Microstructural Response of Nickel-Based Superalloy GH4169 Subjected to Warm Laser Shock Peening

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5172
Author(s):  
Ying Lu ◽  
Yuling Yang ◽  
Jibin Zhao ◽  
Yuqi Yang ◽  
Hongchao Qiao ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Compressive Stress ◽  
Surface Hardness ◽  
Residual Compressive Stress ◽  
Laser Shock Peening ◽  
Effect Of Temperature ◽  
Laser Shock ◽  
Treatment Technology ◽  
Shock Peening ◽  
Gh4169 Alloy

Laser shock peening (LSP), as an innovative surface treatment technology, can effectively improve fatigue life, surface hardness, corrosion resistance, and residual compressive stress. Compared with laser shock peening, warm laser shock peening (WLSP) is a newer surface treatment technology used to improve materials’ surface performances, which takes advantage of thermal mechanical effects on stress strengthening and microstructure strengthening, resulting in a more stable distribution of residual compressive stress under the heating and cyclic loading process. In this paper, the microstructure of the GH4169 nickel superalloy processed by WLSP technology with different laser parameters was investigated. The proliferation and tangling of dislocations in GH4169 were observed, and the dislocation density increased after WLSP treatment. The influences of different treatments by LSP and WLSP on the microhardness distribution of the surface and along the cross-sectional depth were investigated. The microstructure evolution of the GH4169 alloy being shocked with WLSP was studied by TEM. The effect of temperature on the stability of the high-temperature microstructure and properties of the GH4169 alloy shocked by WLSP was investigated.

scholarly journals Impact on Mechanical Properties and Microstructural Response of Nickel-Based Super-Alloy GH4169 Subjected to Warm Laser Shock Peening

2020 ◽  
Author(s):  
Ying Lu ◽  
Yuling Yang ◽  
Jibin Zhao ◽  
Yuqi Yang ◽  
Hongchao Qiao ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Compressive Stress ◽  
Residual Compressive Stress ◽  
Laser Shock Peening ◽  
Effect Of Temperature ◽  
Laser Shock ◽  
Treatment Technology ◽  
Shock Peening ◽  
Super Alloy ◽  
Gh4169 Alloy

Laser shock peening as an innovative surface treatment technology can effectively improve the fatigue life, sur-face hardness, corrosion resistance, and residual compressive stress. Compared with the laser shock peening, the warm laser shock peening (WLSP) is a new surface treatment technology to improve materials’ surface performances, which takes advantage of thermal mechanical effects on stress strengthening and micro-structure strengthening, results in more stable distribution of the residual compressive stress under heating and cyclic loading process. In this paper, the microstructure of GH4169 nickel super-alloy processed by WLSP technology with differ-ent laser parameters were investigated. The proliferation and tangling of dislocations in GH4169 were observed and the dislocation density increased after WLSP treatment. The influences of different treatment by LSP and WLSP on the microhardness distribution of the surface and along cross-sectional depth were investi-gated. The microstructure evolution of the GH4169 alloy being shocked with WLSP were studied by TEM. The effect of temperature on the stability of high temperature microstructure and properties of GH4169 alloy WLP was investigated.

Effect of Laser Shock Peening on the Structure and Prosperity of K403 Alloy

2014 ◽  
Vol 670-671 ◽  
pp. 52-55
Author(s):  
Yan Chai ◽  
Wei Feng He ◽  
Guang Yu He ◽  
Yu Qin Li
Keyword(s):  
Surface Roughness ◽  
Grain Boundary ◽  
Compressive Stress ◽  
Residual Compressive Stress ◽  
Laser Shock Peening ◽  
Test Results ◽  
Laser Shock ◽  
Surface Microhardness ◽  
Shock Region ◽  
Shock Peening

To solve the crack and fracture problem in blade made of K403 alloy, the samples of K403 are laser shock processed and then the microstructure, microhardness, residual compressive stress and surface roughness of the samples are tested. The test results show that some grains are observed refined in the grain boundary of shock region, the microhardness improves in a depth of 0.8mm from the surface and the surface microhardness improves 16%, a residual compressive stress which is more than 450MPa is developed in a depth of 1mm from the surface, and obvious changes of the surface roughness are not tested.

The Effects of Laser Shock Peening on Fatigue Life in Ni-Based Superalloy

2010 ◽  
Vol 135 ◽  
pp. 209-214 ◽  
Author(s):  
Wei Feng He ◽  
Ying Hong Li ◽  
Qi Peng Li ◽  
Hai Lei Liu ◽  
Yu Qin Li ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Compressive Stress ◽  
Structure Design ◽  
High Density ◽  
Residual Compressive Stress ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Vibration Fatigue ◽  
Shock Peening

The goal of this work was to determine effects of laser shock peening (LSP) on the fatigue life of the nickel-based superalloy, as well as the mechanism including the residual stress-depth profile (both depth of compression and magnitude) and the microstructure. The vibration fatigue performance of the standard test coupons made by Ni-based superalloy K417 with and without laser shock peening is researched. The residual stress distribution and microscopic structure after LSP are tested and analyzed by X-ray diffraction, SEM and TEM. The results indicated that the compress residual stress is up to 1.0mm in the test coupons after LSP, and the maximum residual compressive stress is about 660MPa under the surface. At the same time, the high pressure shock wave caused by laser propagate into the material which formed high density dislocation in the surface of the samples, and the γ' is divided leading to increase the sub-grain. Because of the deep residual compressive stress, high density dislocation and much more sub-grains, the vibration fatigue strength is improved about 180MPa by LSP. It is very instructive in the structure design and applying LSP to Ni-based superalloy.

Effect of laser shock peening and heat‑treated on surface hardness of Ti–6Al–4V

2021 ◽  
Author(s):  
Liming Yuan ◽  
Wentai Ouyang ◽  
Xiu Qin ◽  
Wenwu Zhang ◽  
Pengkai Liu ◽  
...  
Keyword(s):  
Surface Hardness ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Heat Treated ◽  
Shock Peening

Finite Element and Experiment Study on the Effect of Temperature and Laser Intensity on Warm Laser Shock Peening Ni-Based Superalloy Inconel 718

Applied laser ◽  
2013 ◽  
Vol 33 (2) ◽  
pp. 139-143
Author(s):  
Ji Xinglu ◽  
Zhou Jianzhong ◽  
Huang Su ◽  
Chen Hansong ◽  
Xie Xiaojiang ◽  
...  
Keyword(s):  
Finite Element ◽  
Inconel 718 ◽  
Laser Intensity ◽  
Laser Shock Peening ◽  
Effect Of Temperature ◽  
Laser Shock ◽  
Experiment Study ◽  
Shock Peening

Finite Element and Experiment Study on the Effect of Temperature and Laser Intensity on Warm Laser Shock Peening Ni-Based Superalloy Inconel 718

Applied laser ◽  
2013 ◽  
Vol 33 (2) ◽  
pp. 139-143 ◽  
Author(s):  
Ji Xinglu ◽  
Zhou Jianzhong ◽  
Huang Su ◽  
Chen Hansong ◽  
Xie Xiaojiang ◽  
...  
Keyword(s):  
Finite Element ◽  
Inconel 718 ◽  
Laser Intensity ◽  
Laser Shock Peening ◽  
Effect Of Temperature ◽  
Laser Shock ◽  
Experiment Study ◽  
Shock Peening

Improving Room Temperature-Stretch Formability of Magnesium Alloys by Laser Shock Peening

2019 ◽  
Author(s):  
Bo Mao ◽  
Xing Zhang ◽  
Yiliang Liao ◽  
Bin Li
Keyword(s):  
Grain Refinement ◽  
Room Temperature ◽  
Surface Hardness ◽  
Mg Alloys ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Electron Backscattered Diffraction ◽  
Stretch Formability ◽  
Shock Peening ◽  
Refinement Effect

Abstract The applications of magnesium (Mg) and their alloys are often restricted by their poor formability at room temperature. Several strategies have been developed in recent years to enhance the formability of Mg alloys, such as grain refinement and texture weakening, either by alloying or processing. Laser shock peening (LSP) is an advanced laser-based surface processing method which has been utilized improve the surface hardness, fatigue performance, and corrosion resistance of Mg alloys. Recent studies show that LSP can bring significant texture weakening and grain refinement effect in Mg alloy, indicating its potential capability of enhancing the formability of Mg alloys. This research is to explore the applicability of LSP to improve the room temperature-stretch formability of Mg alloys. LSP experiments are carried out on an AZ31B Mg alloys. The microstructure before and after LSP are characterized by optical microscopy (OM) and electron backscattered diffraction (EBSD) microscopy. Erichsen tests are carried out to evaluate the stretch formability of Mg alloys. The results show that LSP can bring texture weakening and grain refinement effect simultaneously, resulting in the improved room temperature-stretch formability of Mg alloys.

scholarly journals Finite Element Modeling of Crack Generation in Laser Shock Peening Processed Airfoils

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Fang Li ◽  
Xue Qi ◽  
Dan Xiang
Keyword(s):  
Surface Treatment ◽  
Treatment Process ◽  
Plastic Material ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
3D Fem ◽  
Fem Model ◽  
Damage Initiation ◽  
Subsurface Cracks ◽  
Shock Peening

Laser shock peening (LSP) is a surface treatment process for airfoils that is achieved by the induction of compressive stress. While LSP is a mature and reliable surface treatment process, slight anomalies during the process, or variations in material ductility and geometries, may cause unintended formation of small subsurface cracks in the resultant LSP processed material. In this study, we developed a 3D FEM model to simulate the formation and predict the sizes of cracks generated by inappropriate LSP processing in airfoil specimens in order to avoid producing such subsurface cracks. The Johnson-Cook plastic material model along with the consideration of effects of high strain rate was used to describe the plasticity of Ti alloys. The constants in this plastic model have been optimized with experimental data. The FEM model also includes both damage initiation and evolution criteria to simulate cracks generated by LSP process in the specimens. The simulated crack sizes and locations in the specimens have been validated by the experimental results.

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