Experimental investigation of laser peening on Ti17 titanium alloy for rotor blade applications

Qiao, Hongchao

doi:10.1016/j.apsusc.2015.05.098

Cited by 57 publications

(11 citation statements)

References 30 publications

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“…Laser shock peening (LSP) process depends on several parameters, such as type of laser source, laser plasma pressure, loading time of laserinduced shock wave, material condition, and plasma confinement layer [14]. The laser plasma pressure can be predicted by the following equation when using water as a confining layer [15]:…”

Section: Laser Shock Peeningmentioning

confidence: 99%

“…Where ‫ܫ(‬ ) is the laser intensity (GW/cm 2 ), (k) energy per pulse of laser beam, (A) spot area and (t) pulse duration. LSP usually done with laser intensity ‫ܫ‬ reach by about several (GW/cm 2 ) for the plasma pressure being enough for inducing of compressive residual stresses [15,16]. Q-switched Nd-Yag laser pulse was used to generate the shock wave on the surface of the specimen, Figure (1(a)).…”

Section: Laser Shock Peeningmentioning

confidence: 99%

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Effect of Laser Shock Peening on the Fatigue Behavior and Mechanical Properties of Composite Materials

Al-Khazraji¹,

Mutasher²

2019

alkej

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In this study, Laser Shock Peening (LSP) effect on the polymeric composite materials has been investigated experimentally. Polymeric composite materials are widely used because they are easy to fabricate and have many attractive features. Unsaturated polyester resin as a matrix was selected and Aluminum powder with micro particles as a reinforcement material was used with different volume fraction (2.5%, 5% and 7.5%). Hand lay-up process was used for preparation the composites. Fatigue test with constant amplitude with stress ratio (R =-1) was carried out before and after LSP process with two levels of energy (1Joule and 2Joule). The result showed an increase in the endurance strength of 25.448% at 7.5% volume fraction when peened is 1J laser energy. Also, the ultimate strength and Young's modulus were increased by 6.474% and 10.588% respectively after LSP with the same laser energy. On the other hand, composites with (2.5% and 5%) volume fraction manifested a reduction in the mechanical and fatigue strength especially when treated by 2J laser energy.

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Section: Laser Shock Peeningmentioning

confidence: 99%

Section: Laser Shock Peeningmentioning

confidence: 99%

Effect of Laser Shock Peening on the Fatigue Behavior and Mechanical Properties of Composite Materials

Al-Khazraji¹,

Mutasher²

2019

alkej

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“…Furthermore, Santhanakrishnan et al, Chun et al and Shariff et al reported on the surface hardening that could be attained by applying laser-based surface heat treatment to tool and plastic molds, as well as railroad steels, respectively [10][11][12]. Hongchao et al also found that laser shock peening enhances the surface hardening behavior and fatigue resistance of titanium (Ti) alloys [13]. Clearly, the surface properties of materials can be controlled by applying these types of laser-based surface modification systems.…”

Section: Introductionmentioning

confidence: 99%

Influence of Laser-Assisted Fusing on Microstructural Evolution and Tribological Properties of NiWCrSiB Coating

Park

Chun

2020

Metals

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The present study examines the applicability of a diode laser-assisted fusing treatment and a temperature-control system to the NiWCrSiB thermal spray coating to develop the enhanced wear resistance of continuous-casting molds. As a result of the use of the lasers, the variations in the microstructure and the hardening behavior during the fusing treatment could be controlled. Fine secondary phases (approximately 0.05–10 μm in size) homogeneously present in the coating after the laser-assisted fusing were observed to be Cr-, Mo- and W-based carbides and borides. Transmission electron microscope analysis was used to characterize these fine secondary phases as M7C3 and M23C6 carbides and M5B3 boride. Because of these fine secondary phases, the hardness increased from 730 (as-sprayed status) to 1230 HV (after fusing at a temperature of 1473 K). Finally, given the formation of fine secondary phases and the occurrence of surface hardening, the laser-assisted fusing treatment was deemed to enhance the tribological performance of the thermal-sprayed coating, in that it exhibited a lower coefficient of friction and lower wear rate than the as-sprayed coating.

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“…Meanwhile, the increase of the dislocation density can bring in the improvement of the yield strength 300 of the material [45]. Therefore, it is more difficult for cracks to initiate on the LPwCed sample than 301 the AC sample; 2) the CRS can significantly increase the closing force of microscopic cracks and retard 302 the crack propagation via blocking and swerving [46]; 3) high density dislocations can induce more 303 grain boundaries which can restrain the slip deformation and plastic flow for crack growth.…”

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confidence: 99%

Investigations into the Improvement of the Mechanical Properties of Ti-5Al-4Mo-4Cr-2Sn-2Zr Titanium Alloy by Using Low Energy Laser Peening without Coating

Xue

Jiao

et al. 2020

Materials

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Mechanical properties, such as residual stress, micro-hardness and fatigue performance, of the Ti-5Al-4Mo-4Cr-2Sn-2Zr titanium alloy were improved via the laser peening without coating (LPwC) with a water-penetrable wavelength of 532 nm and pulse duration of 10 ns. In this paper, three kinds of laser energy, namely 85, 110 and 160 mJ were used to process the samples. The titanium alloy samples were also peened with different impact times (1, 3 or 5 impacts) at the energy of 85 mJ. The micro-hardness and residual stress distribution results provided that LPwC can introduce compressive residual stress (CRS) and also induce hardening of the target materials. Further, micro-hardness and CRS showed the increasing trends when the laser impact times increased. However, the CRS and micro-hardness decreased while the laser energy increased from 110 to 160 mJ, which was attributed to the dynamic equilibrium between the thermal and mechanical effects of LPwC. High cycle fatigue strength of the titanium alloy was significantly improved from 360 to 490.3 MPa after three impacts LPwC. The strengthening mechanism of fatigue strength subjected to LPwC was a combined effect between the laser-induced CRS and the high-density dislocations. 101The LPwC experiment was conducted by a Q-switched Nd:YAG laser with a water-penetrable 102 wavelength of 532 nm (Mianna Q series) which operates at 3 Hz and it can supply an maximum pulse 103 energy of 0.8 J. The full duration half maximum (FWHM) of the laser is 10 ns and it can generate the 104 pulsed laser with the spot size of 400 μm. Multiple pulses (1, 3, 5) and a range of laser energies (85 105 mJ, 110 mJ, 160 mJ) were used, and the effect of the variation of these parameters on the mechanical 106 properties change has been investigated. The detailed laser parameters are shown in Table 2. During 107 the laser processing, the specimens were immersed in the water tank, in which the distance between 108 the surface of the specimen and water surface is about 1-2 mm. In addition, the specimen was fixed 109 on the X-Y two axis translation platform and move in a zigzag scan type (as shown in Figure 1). It 110 can be seen from Figure 3 (Schematic diagram of LPwC experimental setup) that the operation of the 111 platform and the laser were controlled by the PC via a self-programmed software.101 The LPwC experiment was conducted by a Q-switched Nd:YAG laser with a water-penetrable 102 wavelength of 532 nm (Mianna Q series) which operates at 3 Hz and it can supply an maximum pulse 103 energy of 0.8 J. The full duration half maximum (FWHM) of the laser is 10 ns and it can generate the 104 pulsed laser with the spot size of 400 μm. Multiple pulses (1, 3, 5) and a range of laser energies (85 105 mJ, 110 mJ, 160 mJ) were used, and the effect of the variation of these parameters on the mechanical 106 properties change has been investigated. The detailed laser parameters are shown in Table 2. During 107 the laser processing, the specimens were immersed in the water tank, in which the distance between 108...

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Experimental investigation of laser peening on Ti17 titanium alloy for rotor blade applications

Cited by 57 publications

References 30 publications

Effect of Laser Shock Peening on the Fatigue Behavior and Mechanical Properties of Composite Materials

Effect of Laser Shock Peening on the Fatigue Behavior and Mechanical Properties of Composite Materials

Influence of Laser-Assisted Fusing on Microstructural Evolution and Tribological Properties of NiWCrSiB Coating

Investigations into the Improvement of the Mechanical Properties of Ti-5Al-4Mo-4Cr-2Sn-2Zr Titanium Alloy by Using Low Energy Laser Peening without Coating

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