Surface modification of NiTi alloy by ultrashort pulsed laser shock peening

Wang, Hao; Kalchev, Yordan; Wang, Hongcai; Yan, Kai; Gurevich, Evgeny L.; Ostendorf, Andreas

doi:10.1016/j.surfcoat.2020.125899

Cited by 32 publications

(10 citation statements)

References 37 publications

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“…2021, 11, 515 2 of 10 laser shock peening can increase the surface microhardness and enhance the mechanical property (such as wear-resistance) of NiTi alloy [13]. In our previous research, we also got similar results when the metals, such as aluminum, high strength, and NiTi alloy, were processed with laser shock peening [14][15][16]. In this research, the laser nitriding process with fiber laser was used to modify the surface mechanical property of NiTi alloy to enhance its wear and abrasion resistance.…”

Section: Introductionmentioning

confidence: 69%

The Effect of Laser Nitriding on Surface Characteristics and Wear Resistance of NiTi Alloy with Low Power Fiber Laser

et al. 2021

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The laser nitriding was performed in nitrogen gas at room temperature (20 °C) and low temperature (−190 °C) by a low power fiber laser to modify the wear and abrasion resistance of NiTi alloy. The surface roughness and element composition were analyzed by roughness device and energy-dispersive X-ray spectroscopy respectively. The results of roughness show that laser treatment can change the surface roughness due to the laser remelting. The effect of laser nitriding on the microhardness, friction coefficient, and worn scars of NiTi alloy was also studied, which shows that the microhardness of the NiTi alloy increases after laser nitriding. The optical microscope and scanning electron microscope were used to characterize the surface of NiTi alloy after wear testing to observe the microstructure of worn scars. The results show that the laser nitriding with different parameters can induce a nitride layer with different thicknesses and the higher energy deposition is the key factor for the formation of the nitride layer, which can decrease the friction coefficient and reduce wear loss during the application of NiTi alloy. The improvement of wear resistance can be attributed to the hard nitriding layer.

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Section: Introductionmentioning

confidence: 69%

The Effect of Laser Nitriding on Surface Characteristics and Wear Resistance of NiTi Alloy with Low Power Fiber Laser

et al. 2021

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“…Ultra-short pulse (USP) lasers emit pulses in the pico-and femtosecond range and have gained particular significance in high-precision micro-material processing due to negligible thermal load, often attributed to the so-called cold ablation [1,2]. Thus, USP lasers are typically used in electronics manufacturing [3][4][5], medical technology [6][7][8][9][10], aerospace applications [11][12][13], thin film technology [14] and material modification [15][16][17][18][19][20]. Although excellent processing qualities are possible, a broad adoption in industrial applications is constrained by low processing speeds and consequently limited productivity [21].…”

Section: Introductionmentioning

confidence: 99%

Characterization of a hybrid scanning system comprising acousto-optical deflectors and galvanometer scanners

Franz

Häfner²,

Kunz³

et al. 2022

Appl. Phys. B

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We report on the characterization of a hybrid laser scanning system using acousto-optical deflectors in combination with galvanometer scanners for ultra-short pulse laser material processing. The hybrid scanning system is characterized by the roundness of static pulsed ablations of metal thin film on a transparent substrate within the acousto-optical scanning field at different galvanometer scanner deflection angles and laser focal positions. An ablation roundness of more than 90% is reached in a defocusing range of 200 $$\upmu \text{m}$$ μ m within a galvanometer scanfield of 900 $$\text{mm}^2$$ mm 2 , corresponding to approximately 74% of the usable scan area of the f-theta lens. A high maximum positioning speed of 843 m/s is pointed out within an acousto-optical scanfield of 0.4 $$\text{mm}^{2}$$ mm 2 by applying positioning frequencies of up to 1 MHz across a distance of 843 $$\upmu \text{m}$$ μ m . Consequently, the hybrid scanning system combines the advantages of optical and mirror-based scanners, enabling a highly dynamic and extremely precise laser beam positioning in a large processing area.

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“…Laser shock peening (LSP) [5,6] has been used widely in the industry to improve the fatigue life of materials due to its geometry-free advantage. It can enhance the fatigue life of metals by inducing both surface nanocrystallization [7] and surface compressive residual stress [8,9].…”

Section: Introductionmentioning

confidence: 99%

Measurement of two-dimensional residual stress in nanocrystalline superelastic NiTi fabricated with pre-strain laser shock peening

Yan

Wei

Chu

et al. 2022

Mathematics and Mechanics of Solids

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The measurement of residual stress is a challenging issue in industrial fields. In this work, focused ion beam (FIB) and digital image correlation (DIC) are combined together to measure the two-dimensional residual stress in nanocrystalline NiTi plates processed with pre-strain laser shock peening (LSP). A four-point bending experiment verifies the accuracy of this measurement method. The pre-strain LSP-treated surfaces are found to have significant compressive residual stress along the pre-strain direction and tensile residual stress along the vertical to pre-strain direction, which verifies pre-strain LSP as an efficient approach to create gradient residual stress layers in nanocrystalline NiTi plates. The FIB-DIC method has also proven to be an attractive tool to measure the two-dimensional residual stress in phase transition nanocrystalline materials.

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Surface modification of NiTi alloy by ultrashort pulsed laser shock peening

Cited by 32 publications

References 37 publications

The Effect of Laser Nitriding on Surface Characteristics and Wear Resistance of NiTi Alloy with Low Power Fiber Laser

The Effect of Laser Nitriding on Surface Characteristics and Wear Resistance of NiTi Alloy with Low Power Fiber Laser

Characterization of a hybrid scanning system comprising acousto-optical deflectors and galvanometer scanners

Measurement of two-dimensional residual stress in nanocrystalline superelastic NiTi fabricated with pre-strain laser shock peening

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