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EXPERIMENTAL RESEARCH OF DENDRITIC CRYSTALS FORMATION ON METAL SURFACE BY LASER RADIATION

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Subject of research. We study conditions of fractal crystals growth on the high-temperature material surface under pulsed laser radiation impact. Method. Comprehensive studies were performed on the metal surface morphology after impact of microsecond laser pulses by optical and electron microscopy for analysis of the size of the melting zone and the presence/absence of surface fractal crystals. The experimental data were used to calculate the possible thickness of the melt layer for specific parameters of laser radiation. According to the calculated data, the range of calculated values of the melting layer thickness was determined, at which the stable growth of fractal crystals on the surface of stainless steel occurred. The parametric variation of the laser pulses was carried out in the following ranges: energy in the range of 10–15 J, pulse duration in the range of 6–12 μs, spot diameter in the range of 0.4–2 mm. Main results. Combinations of parameters for formation and stable growth of fractal clusters as the dendrites form were determined. The reliability of the estimates obtained were tested on another type of stainless steel with drastically different characteristics. Practical relevance. Research results are applicable for parameters determination of pulsed laser radiation exposure to obtain surface morphology with desired properties.

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