PSI - Issue 81

Vitalii Mocharskyi et al. / Procedia Structural Integrity 81 (2026) 31–34

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Surface laser treatment of materials can be performed with lasers with different pulse durations: femtosecond lasers (Swen Grossmann et al., 2022; H. Huang et al., 2004), picosecond (Muhammad N. et. al., 2012; Ming Chu Kong et al., 2014), and nanosecond (Biffi C.A. et al., 2023; Changyoung Ryu et al., 2024; Choi H. et al., 2024). Nanosecond laser treatment has found its application in medicine to improve surface properties, increase biocompatibility and in the manufacture of stents (Shang Li et al., 2019; Cadena C. Mariana et al., 2022; Neha Agarwal et al., 2025). It is of interest to investigate the structure and properties of superelastic nitinol after nanosecond laser processing in order to find optimal processing parameters for various tasks in materials science and industry. 2. Experimental methodology Nitinol samples (Fig. 1) were processed using an Nd:YAG laser (Fig. 2). Irradiation was carried out in air. Wavelength – 1064 nm, pulse duration – 10 ns, pulse energy – up to 1.5 J, pulse frequency – 10 Hz, laser spot diameter – 4 mm.

Fig. 1. Static tensile test specimens which were processed by laser After processing, static tensile tests were performed according to ASTM F2516-14 standard. After the tests, tensile stress-strain curves of nitinol before and after laser processing were plotted. The surface of the samples and fracture fractograms were investigated using scanning electron microscopy.

Fig. 2. Scheme of nanosecond laser processing of samples and the processes that occur during it