Experimental Study on Improving High-Cycle Fatigue Performance of TC11 Titanium alloy by Laser Shock Peening

Xiangfan, 聂祥樊 Nie; Weifeng, 何卫锋 He; Shunlai, 臧顺来 Zang; Xuede, 王学德 Wang; Yuqin, 李玉琴 Li

doi:10.3788/cjl201340.0803006

Cited by 3 publications

(1 citation statement)

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“…LSP is a novel surface treatment technique, which can significantly improve the fatigue life of metals by the effects of laser inducing shock waves [1][2][3][4] . In LSP process, the laser intensity is on the order of several GW/cm 2 and the pulse time of the laser is on the order of 10 ns.…”

Section: Introductionmentioning

confidence: 99%

Surface Morphology and Deformation Mechanism of Single Crystal Copper Treated by Laser Shock Peening

Liu

Wang

et al. 2014

AMR

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Abstract.To study the relation between surface morphology and deformation mechanism of the target material under the shock, a flexible boundary loading, in laser shock peening(LSP), the macroscopic and microscopic surface morphology of a single crystal copper treated by LSP was investigated. The optical profilometer shows a 200-µm-deep pit forms on the shocked surface under LSP. The optical microscopy shows a set of parallel slip bands appear at the center of the shocked region and many vertical cross slip bands appear at the edge of shocked region. This indicates a large plastic deformation occurs by means of slip for the single crystal copper under LSP and the distributing features of slip bands correspond to the spatial distribution of the shock pressure. The results confirm that the surface morphology of materials under LSP can reflect the deformation mechanism and it can be a new method of studying the deformation mechanism of materials under LSP.

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Section: Introductionmentioning

confidence: 99%

Surface Morphology and Deformation Mechanism of Single Crystal Copper Treated by Laser Shock Peening

Liu

Wang

et al. 2014

AMR

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Thermal stability study of TC11 titanium alloy thin component after surface nanocrystallization induced by laser shock processing

et al. 2022

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Laser shock peening (LSP) can induce the compressive residual stress (CRS) on the surface of the material, and surface nanocrystallization can be realized with a nanocrystal layer, thereby significantly improving the high-cycle fatigue performance. However, due to weak material constrain and the high working temperature of thin aero-engine compressor blades, CRS and refined grain structure are more likely to result in stress relaxation and microstructural recovery under thermal stress load, resulting in reducing the anti-fatigue effect of LSP. In this paper, on the basis of the surface nanocrystallization induced by LSP, residual stress and microstructure of TC11 titanium alloy thin components were measured and observed. The residual stress relaxation was characterized and the microstructure evolution was discussed. Also, the thermal stability mechanism of CRS and the nanostructure on the surface were analyzed. The experimental results show that after thermal loads, the CRS was decreased, and the stress relaxation amplitude was increased with an increase in temperature. After annealing at 400 °C, the dislocation density was significantly reduced, but the grain sizes of surface nanostructure did not greatly increase. After annealing at 400 °C for 2 h, the fatigue strength of the LSPed specimen was reduced compared with that before annealing, but it was still increased compared with the original state without LSP, especially under high-power density for multiple LSP treatment. It can be concluded that the surface nanostructure has good stability and effectively retards the initiation of fatigue cracks on the surface, which ensures the effectiveness of LSP under thermal loads.

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Numerical investigation of the effect of oblique laser shock processing parameters on the residual stress and deformation characteristics of TC6 titanium alloy

Liu,

Li,

Wang

et al. 2023

Journal of Laser Applications

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Oblique laser shock processing (OLSP) can provide a new solution for improving the mechanical properties of complex structural elements. In this paper, a spatial distribution model of OLSP shock wave pressure is established and validated to study the residual stress (RS) field and surface morphology of titanium alloy TC6 treated by OLSP using the finite element method. The effects of the incident angle, overlapping rate, and scanning pattern on the RS field and surface morphology were investigated. The OLSP results indicate that the overlapping rate should be at least 50%. The RS field and surface morphology obtained with the interval scanning pattern are more uniform compared to snake and spiral. With a 50% overlapping rate and interval scanning pattern, the surface roughness was found to be 0.16, and the surface residual compressive stress fluctuation amplitude was reduced by 40.07%. The results provide a theoretical basis for complex structures of LSP.

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Experimental Study on Improving High-Cycle Fatigue Performance of TC11 Titanium alloy by Laser Shock Peening

Cited by 3 publications

References 0 publications

Surface Morphology and Deformation Mechanism of Single Crystal Copper Treated by Laser Shock Peening

Surface Morphology and Deformation Mechanism of Single Crystal Copper Treated by Laser Shock Peening

Thermal stability study of TC11 titanium alloy thin component after surface nanocrystallization induced by laser shock processing

Numerical investigation of the effect of oblique laser shock processing parameters on the residual stress and deformation characteristics of TC6 titanium alloy

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