Effects of Laser Shock Processing on Fatigue Performance of Ti-17 Titanium Alloy

Huang, Shuai; Zhu, Ying; Guo, Wei; Qiao, Hongchao; Diao, Xungang

doi:10.1515/htmp-2015-0245

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…The number of slip bands increased, and three directions of slip bands appeared in the same grain. After laser shock peening, the plastic deformation of the material and the dislocation density conformed to the following relationship [23];…”

Section: Effects Of Different Laser Shock Treatments On the Microstru...mentioning

confidence: 94%

“…As the dislocation density increases and the distance between dislocations decreases, the amount of plastic deformation of the material increases. High pressure shock waves induced by the laser cause severe plastic deformation of the materials, resulting in a large number of multiplied dislocation slips that are hindered by grain After laser shock peening, the plastic deformation of the material and the dislocation density conformed to the following relationship [23]; ε = Kρχb where ε is the amount of plastic deformation, K is the dislocation coefficient, ρ is the dislocation density, χ is the distance between dislocations, and b is the Parker vector.…”

Section: Effects Of Different Laser Shock Treatments On the Microstru...mentioning

confidence: 97%

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Study on the Effects of Multiple Laser Shock Peening Treatments on the Electrochemical Corrosion Performance of Welded 316L Stainless Steel Joints

Fan

Wen

et al. 2022

Metals

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To study the influence of laser shock peening on the electrochemical corrosion resistance of welded 316L stainless steel joints, welded 316L stainless steel joints are treated with different laser shock peening treatments (i.e., one, two, and three times). Our analysis employs electron backscattering diffraction (EBSD), scanning electron microscopy (SEM), X-ray diffraction (XRD), an X-ray stress meter, and electrochemical corrosion tests to observe and analyze the microstructure, structural composition, residual stress, and corrosion resistance in different areas of the surface of 316L before and after the laser shock peening. The results show that the residual stress distribution of the welded joints is optimized after laser shock peening, with a maximum residual compressive stress near the matrix of 171 MPa. When the number of laser shock peening treatments is two, the corrosion current reaches a minimum of 9.684×10−7 A/cm2, and optimal pitting resistance is obtained. However, when the number of laser shock peening treatments is further increased to three, the corrosion current increase and the pitting resistance decreases. In summary, the electrochemical corrosion resistance of the welded joints effectively improves after laser shock peening, but its performance begins to decline after three repeated shocks, which is related to the combined effects of stress change and microstructure phase transformation.

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Section: Effects Of Different Laser Shock Treatments On the Microstru...mentioning

confidence: 94%

Section: Effects Of Different Laser Shock Treatments On the Microstru...mentioning

confidence: 97%

Study on the Effects of Multiple Laser Shock Peening Treatments on the Electrochemical Corrosion Performance of Welded 316L Stainless Steel Joints

Fan

Wen

et al. 2022

Metals

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show abstract

“…In the past several decades, several traditional and novel surface treatment techniques, like shot peening (SP) [7,8], surface mechanical attribution treatment (SMAT) [9] and also laser shock peening (LSP) [10,11], have been successfully used to enhance the surface mechanical properties and refine the microstructures to improve the fatigue performance of the metallic components. Owing to the high flexibility and non-contact features of the laser, laser shock peening has evolved as a better tool to enhance the fatigue performance of the titanium alloys [12][13][14].…”

Section: Introductionmentioning

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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Progressive developments, challenges and future trends in laser shock peening of metallic materials and alloys: A comprehensive review

Deng

Wang

et al. 2023

International Journal of Machine Tools and Manufacture

118

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Effects of Laser Shock Processing on Fatigue Performance of Ti-17 Titanium Alloy

Cited by 5 publications

References 15 publications

Study on the Effects of Multiple Laser Shock Peening Treatments on the Electrochemical Corrosion Performance of Welded 316L Stainless Steel Joints

Study on the Effects of Multiple Laser Shock Peening Treatments on the Electrochemical Corrosion Performance of Welded 316L Stainless Steel Joints

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

Progressive developments, challenges and future trends in laser shock peening of metallic materials and alloys: A comprehensive review

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