scholarly journals The Q-switched Nd:YAG laser shock processing effects on mechanical properties of C86400 Cu-Zn alloy

2019 ◽  
Vol 17 (42) ◽  
pp. 136-140 ◽  
Author(s):  
Mays Oday Hashim ◽  
Dr. Razi Al-Azawi ◽  
Dr. Abdul Hadi Kadhim
Keyword(s):  
Surface Roughness ◽  
Laser Pulse ◽  
Pulse Energy ◽  
Nd:Yag Laser ◽  
Laser Pulse Energy ◽  
Laser Shock ◽  
Micro Hardness ◽  
Laser Shock Processing ◽  
Shock Processing ◽  
Zn Alloy

The aim of this paper is to investigate the effects of Nd:YAG laser shock processing (LSP) on micro-hardness and surface roughness of 86400Cu-Zn alloy. X-ray fluorescence technique was used to analyze the chemical composition of this alloy. LSP treatment was performed with a Q-switched Nd: YAG laser with a wavelength of 1064 nm. The results show that laser shock processing can significantly increase. The micro-hardness and surface roughness of the LSP-treated sample. Vickers diamond indenter was used to measure the micro-hardness of all samples with different laser pulse energy and the different number of laser pulses. It is found that the metal hardness can be significantly increased to more than 80% by increasing the laser energy and the number of laser pulse irradiated per unit area. The relationship between laser pulse energy and the value of surface roughness is a proportionality due to the increase in ablation processes which are associated with LSP at sample surface caused by the increasing of laser pulse energy.

Effects of Laser Shock Processing on Micro-Hardness of Ni-Based Superalloy K417 at Elevated Temperature

2012 ◽  
Vol 39 (7) ◽  
pp. 0703005 ◽  
Author(s):  
任旭东 Ren Xudong ◽  
皇甫喁卓 Huangfu Yongzhuo ◽  
阮亮 Ruan Liang ◽  
杨慧敏 Yang Huimin ◽  
占秋波 Zhan Qiubo
Keyword(s):  
Elevated Temperature ◽  
Laser Shock ◽  
Micro Hardness ◽  
Laser Shock Processing ◽  
Shock Processing

Effect of Nd:YAG Laser Pulse Energy on Mercury Vapor Release from the Dental Amalgam

2013 ◽  
Vol 31 (10) ◽  
pp. 480-485
Author(s):  
Siavash Savadi Oskoee ◽  
Mahmoud Bahari ◽  
Soodabeh Kimyai ◽  
Sahand Rikhtegaran ◽  
Firooz Puralibaba ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Pulse Energy ◽  
Nd:Yag Laser ◽  
Laser Pulse Energy ◽  
Mercury Vapor ◽  
Dental Amalgam

scholarly journals Carbon Nanoparticles Synthesis By Different Nd:Yag Laser Pulse Energy

2021 ◽  
Vol 27 (7) ◽  
pp. 1-12
Author(s):  
Malak Mohammed Fahad ◽  
Munaf S. Majeed ◽  
Emad Talib Hashim
Keyword(s):  
Particle Size ◽  
Laser Pulse ◽  
Pulse Energy ◽  
Nd:Yag Laser ◽  
Carbon Nanoparticles ◽  
Laser Pulse Energy ◽  
Carbon Surface ◽  
Laser Ablation In Liquid ◽  
Force Microscopy ◽  
Incident Laser Pulse

One of the most important techniques for preparing nanoparticle material is Pulsed Laser Ablation in Liquid technique (PLAL). Carbon nanoparticles were prepared using PLAL, and the carbon target was immersed in Ultrapure water (UPW) then irradiated with Q-switched Nd:YAG laser (1064 nm) and six ns pulse duration. In this process, an Nd:YAG laser beam was focused near the carbon surface. Nanoparticles synthesized using laser irradiation were studied by observing the effects of varying incident laser pulse intensities (250, 500, 750, 1000) mJ on the particle size (20.52, 36.97, 48.72, and 61.53) nm, respectively. In addition, nanoparticles were characterized by means of the Atomic Force Microscopy (AFM) test, pH easurement, and an Electrical Conductivity (EC) test of the nano solution. The smallest particle size was produced with (250) mJ laser pulse energy.                                                                    

Study of the Effect of Coatings on Mechanical Properties of TC4 Titanium Alloy during Laser Shock Processing

2006 ◽  
Vol 532-533 ◽  
pp. 73-76 ◽  
Author(s):  
Xu Dong Ren ◽  
Yong Kang Zhang ◽  
Jian Zhong Zhou ◽  
Ai Xin Feng ◽  
De Jun Kong
Keyword(s):  
Mechanical Properties ◽  
Laser Pulse ◽  
Yield Strength ◽  
Surface Hardness ◽  
Aluminum Foil ◽  
Pulse Generation ◽  
Fatigue Properties ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Shock Processing

During the process of laser shock processing (LSP), we use high power Nd:Glass laser systems which result in significantly improve fatigue properties and stress corrosion cracking in titanium components. An ablative coating such as black painting and aluminum foil are used to protect the titanium component from surface melting by laser pulse, which adversely affects sample fatigue life. Three different shock-processing configurations are considered: non-ablative exposure, aluminum foil and confined ablation with black painting. We analyzed effect of the coatings on the shock wave propagation into the titanium specimen and the resulting change in mechanical properties versus depth. Near the surface, yield strength and hardness are found to be increased by laser shock, the titanium surface for all coatings increased in yield strength by 16% to 37%. The result have demonstrated that surface hardness can be improved by 31 percent over a machine worked surface with black paintings and be improved by 25 percent with aluminum foil .The experiment aim is to report the effect of the ablative, sacrificial coatings on the laser pulse generation of shock waves and their propagation into the titanium alloys and the resulting change in mechanical properties below the surface versus depth.

Experimental Research on TC4 Alloy by Laser Shock Processing

2011 ◽  
Vol 418-420 ◽  
pp. 1930-1933
Author(s):  
Feng Jie Tian
Keyword(s):  
Compressive Stress ◽  
Pulse Width ◽  
Alloy Sample ◽  
Aviation Material ◽  
Laser Shock ◽  
Micro Hardness ◽  
Laser Shock Processing ◽  
Large Margin ◽  
Tc4 Alloy ◽  
Shock Processing

In order to study the effect of laser shock processing (LSP) on titanium alloy, a TC4 alloy sample was processed by Nd:YAG laser with the wavelength of 1.06μm and pulse width of 12ns, and its micro-hardness and residual stress were examined and analyzed. The experimental results show that an evident strengthening layer of sample forms in the laser shock processing area. Laser shock processing improves micro-hardness and residual compressive stress of the sample significantly such as surface micro-hardness increases by up to 28.4%, the tensile stress changed into compressive stress, the layer of compressive stress distributes more than 1mm in depth and the compressive stress in the surface reaches up to -304MPa with 5J pulse energy. The effect of laser shock evidently strengthens the TC4 alloy, which improves the fatigue life of the aviation material and the performance of resist stress and rust by a large margin.

scholarly journals Effect of Multipath Laser Shock Processing on Microhardness, Surface Roughness, and Wear Resistance of 2024-T3 Al Alloy

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Abdulhadi Kadhim ◽  
Evan T. Salim ◽  
Saeed M. Fayadh ◽  
Ahmed A. Al-Amiery ◽  
Abdul Amir H. Kadhum ◽  
...  
Keyword(s):  
Shock Wave ◽  
Surface Roughness ◽  
Short Pulse ◽  
Metallic Surface ◽  
High Peak Power ◽  
Al Alloy ◽  
Treatment Technique ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Shock Processing

Laser shock processing (LSP) is an innovative surface treatment technique with high peak power, short pulse, and cold hardening for strengthening metal materials. LSP is based on the application of a high intensity pulsed laser beam(I>1 GW/cm2;  t<50 ns)at the interface between the metallic target and the surrounding medium (a transparent confining material, normally water) forcing a sudden vaporization of the metallic surface into a high temperature and density plasma that immediately develops inducing a shock wave propagating into the material. The shock wave induces plastic deformation and a residual stress distribution in the target material. In this paper we study the increase of microhardness and surface roughness with the increase of laser pulse energy in 2024-T3 Al alloy. The influence of the thickness of the confining layer (water) on microhardness and surface roughness is also studied. In addition, the effect of LSP treatment with best conditions on wear behaviors of the alloy was investigated.

Application of Central Composite Design Based on Numerical Integration for Optimization of Laser Shock Peening

2012 ◽  
Vol 452-453 ◽  
pp. 1074-1078
Author(s):  
Gang Zheng ◽  
Jin Rong Fan ◽  
Shu Huang ◽  
Jian Zhong Zhou ◽  
Hong Yan Ruan
Keyword(s):  
Residual Stress ◽  
Laser Pulse ◽  
Pulse Energy ◽  
Surface Deformation ◽  
Laser Pulse Energy ◽  
Laser Shock Peening ◽  
Beam Diameter ◽  
Laser Shock ◽  
Energy Beam ◽  
Shock Peening

In order to analyze effect of processing parameters on Laser Shock Peening(LSP), a novel numerical model integrated with FEM and statistical optimization algorithm was established, and the numerical simulation of LSP process was carried out. In simulation, laser pulse energy, beam diameter and center distance were considered as control parameters, while the compressive residual stress and the deformation value as output aim parameters,. The results indicates that the laser pulse energy has the strongest impact on the surface residual stress, while the spot diameter affects the section residual stress and the surface deformation. Moreover, the response surface function was applied to predict and optimize laser parameters. Lastly the presented method was verified by experiments.

Fabrication and Characterization of Micro-Dent Produced by Laser Shock Peening on Zr-Based Bulk Metallic Glass

2016 ◽  
Vol 849 ◽  
pp. 14-21
Author(s):  
Yun Hu Zhu ◽  
Jie Fu ◽  
Chao Zheng ◽  
Zhong Ji
Keyword(s):  
Plastic Deformation ◽  
Laser Pulse ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Pulse Energy ◽  
Laser Pulse Energy ◽  
Laser Energy ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening

A Zr41.2Ti13.8Cu12.5Ni10Be22.5 (vit1) bulk metallic glass was processed by Nd: Glass laser pulses with duration 30ns and energy in the range 20 to 30J. The surface morphology and surface micro-hardness of the vit1 metallic glass, treated with varying laser energy, had been studied in detail. Laser shock peening induced plastic deformation and caused a micro-dent to be generated on the vit1 surface. The optical profiling tests showed that laser pulse energy greatly influenced the diameter and depth of the micro-dents. The surface roughness which was caused by various laser pulse energy was assessed and characterized. The three-dimensional surface topography of the laser treated region on vit1 surfaces had been characterized. In addition the plastic deformation features were also studied.

Relation research on laser-induced shockwave and laser pulse in laser shock processing

2009 ◽  
Author(s):  
Xia Ye ◽  
Yongkang Zhang ◽  
Hongbing Yao ◽  
Guilin Ding ◽  
Yanqun Tong ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Shock Processing
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