Effects of Laser Shock Processing on Vibration Fatigue Properties of K417 Material

Wei, 李伟 Li; Weifeng, 何卫锋 He; Yinghong, 李应红 Li; Cheng, 汪诚 Wang; Zhuojun, 杨卓君 Yang

doi:10.3788/cjl20093608.2197

Cited by 8 publications

(6 citation statements)

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“…In LSP, the region to be shocked is covered by two different layers, namely an ablating layer and a water confining layer. The ablating layer is used to increase the shock wave intensity and to protect the metal's surface from laser ablation and melting [8,9] , which can be Al foil, black paint etc. When a laser pulse with sufficient intensity irradiates the ablating layer covered on the metal target, the ablating material vaporizes and forms a high temperature and pressure plasma.…”

Section: Fig1 Schematically Principle Of Laser Shock Processingmentioning

confidence: 99%

A Study of the Microstructure and Hardness of Ti-5Al-2Sn-2Zr-4Mo-4Cr by Laser Shock Peening

Nie

et al. 2011

AMM

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In this paper, the microstructure and hardness of Ti-5Al-2Sn-2Zr-4Mo-4Cr titanium alloy with and without laser shock peening (LSP) were examined and compared. The titanium alloy samples were laser shock peened with different layers at the same power density. The microscopic structure after LSP are tested and analyzed by SEM and TEM. The results indicated that LSP changed the microstructure evidently. After 3 layers laser shock peening, there are nanocrystallization in the LSP zone. The shock wave provided high strain rate deformation and generated high-density dislocations in the material. Multiple severe plastic deformation caused by 3 to 5 LSP layers helped to rearrange the resultant dislocation, to form dislocation networks, leading to the formation of nanocrystallites. On the other hand, the microhardness across the polished surfaces of the titanium materials with and without LSP was measured. It is obvious that the laser shock peening improved the microhardness of the Ti-5Al-2Sn-2Zr-4Mo-4Cr for about 16% at the surface, and the affected depth is about 300 microns from the surface.

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Section: Fig1 Schematically Principle Of Laser Shock Processingmentioning

confidence: 99%

A Study of the Microstructure and Hardness of Ti-5Al-2Sn-2Zr-4Mo-4Cr by Laser Shock Peening

Nie

et al. 2011

AMM

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“…Microscale laser shot peening (µ LSP) technology to solve the above problem provides a new way. Microscale laser shot peening (µ LSP) technology to solve the micro-structure of the modified surface to prolong life provides a new method, it is in the laser shot peening developed on the basis of, use high repeat rate of short pulse laser beam and material interaction of pressure wave induced surface modification of technology, by strengthening the role [8] and moderate residual stress distribution, can greatly improve the mechanical properties of the micro components [9,10] , so as to improve the structure reliability, the difference is energy for yellow hair to the focal range; the flare for sub-micrometer range.…”

Section: Introductionmentioning

confidence: 99%

Based on Microscale Laser Shock Processing of Metal Material Characteristics Analysis and Prospect

Wang

Zhu

Xie

et al. 2012

AMR

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It is introduced that laser shock peening is suitable for machining metal micro components. The micro scale effect and elastic-plastic theory of micro scale laser shock processing were analyzed and discussed. The research status, mechanism, key technology and influence factors of microscale lager shock peening were summarized and the problems in microscale lager shock peening were analyzed, which provides guidance for further research.

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“…Laser Shock Processing (LSP) technique treats the target through localized mechanical deformation by employing the shock waves generated at the work piece surface by high intensity lasers. The shock waves are generated through ablation of surface material, which is transformed into high pressure plasma, consequently applying a shock wave on the material surface [9][10][11][12]. The strain rate caused by LSP is very high, up to 10 6 s -1 , which can cause SPD in the surface, thus improving the microhardness of materials and making materials with nanometer-or submicrometer-sized grains [13].…”

Section: Introductionmentioning

confidence: 99%

Thermostablity Study on Microstructure and Microhardness of Laser Shock Processed Ti-6Al-2.5Mo-1.5Cr-0.5Fe-0.3Si

et al. 2011

MSF

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In this paper, the microstructure and microhardness of laser shock processed (LSP) Ti-6Al-2.5Mo-1.5Cr-0.5Fe-0.3Si titanium alloy with and without annealing were examined and compared. The titanium alloy samples were LSP processed with 3 layers at 4.24GW/cm2. Some of the samples were vacuum annealed at 623K for 10 hours. The microscopic structure with and without annealing were tested and analyzed by SEM, TEM. The results indicated that after LSP, the shock wave provided high strain rate deformation and led to the formation of ultra-fine grain. Comparing with the samples without annealing, the dislocation density was lower and the grain-boundary was more distinct in the annealed samples, but the sizes of the ultra-fine grain didn’t grow bigger after annealing. On the other hand, the microhardness measurement was made on the cross-section. It is obviously that the laser shock processing improved the microhardness of the Ti-6Al-2.5Mo-1.5Cr-0.5Fe-0.3Si for about 12.2% at the surface, and the hardness affected depth is about 500 microns. The microhardness after annealing is 10 HV0.5lower, but the affected depth is not changed. The titanium alloy after LSP is thermostable at 623K; thus break the USA standard AMS2546, in which titanium parts after LSP are subjected in subsequent processing should not exceed 589K.

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Effects of Laser Shock Processing on Vibration Fatigue Properties of K417 Material

Cited by 8 publications

References 0 publications

A Study of the Microstructure and Hardness of Ti-5Al-2Sn-2Zr-4Mo-4Cr by Laser Shock Peening

A Study of the Microstructure and Hardness of Ti-5Al-2Sn-2Zr-4Mo-4Cr by Laser Shock Peening

Based on Microscale Laser Shock Processing of Metal Material Characteristics Analysis and Prospect

Thermostablity Study on Microstructure and Microhardness of Laser Shock Processed Ti-6Al-2.5Mo-1.5Cr-0.5Fe-0.3Si

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