OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 27 No. 2 2025 Fig. 13. Scratch test results under varying load (0.5 to 30 N) (a, b) and constant load (20 N) (c, d) for cast (a, c, e) and additively manufactured (b, d, f) ZhS6U alloy samples after low frequency impact processing, and mean of coefficient of friction of deformed surface under constant load 20 N (e, f) a b c d e f a final comparison of the analyzed samples after HF impact treatment, based on constant loading scratch testing and presented as the average coefficient of friction dependences. The dependences show that HF impact treatment of cast nickel alloy leads to an increase in the tendency of the coefficient of friction, with a decrease observed only at the maximum treatment time (40 seconds), where the coefficient drops to 0.125 compared to 0.17 in the initial condition (Fig. 14, e). After HF impact treatment of the EBAM sample,
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