OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 27 No. 2 2025 the treatment frequency and duration. For example, LF treatment of the additively manufactured sample results in microstrain values 1.71 times higher, microstress values 2.73 times higher, and microhardness values 1.08 times higher than the cast sample. With HF treatment, the lattice microstrain values of the additively manufactured sample are 2.18 times higher than those of the cast sample, the microstress values are 2.09 times higher, and the microhardness values are 1.16 times higher. The values of the coefficient of friction depend on the treatment time. With both low- and high-frequency impact treatment, the coefficient of friction of the cast ZhS6U increased up to the third control point (20 seconds for LF treatment, 20 min for HF treatment), after which it sharply decreased, reaching values lower than those of the initial material. LF treatment of ZhS6U obtained by EBAM led to a gradual decrease in the coefficient of friction, while HF impact treatment led to a gradual increase in the coefficient of friction with a slight decrease at the fourth control point (20 minutes). Thus, the treatments have a significant influence on the phase composition, mechanical properties, and tribological characteristics of the alloys. The additive material, in contrast to the cast, exhibits increased sensitivity to external influences, which is expressed in higher microstrains, stresses, and a unique friction response. These characteristics may be related to the initial microstructure formed by the additive manufacturing method. This work demonstrates the possibility of effectively strengthening nickel-based ZhS6U alloy produced by casting and additive manufacturing through mechanical impulse treatment in different frequency ranges. This allows for the formation of a surface layer with improved characteristics: the microhardness increases up to 670 HV, the coefficient of friction decreases to 0.075, and a favorable phase structure is formed with the γ’-phase or the formation of an additional TiO2-phase. At the same time, the additively manufactured samples show greater sensitivity to the treatment, which requires optimization of the parameters for each material type, and the developed approaches can be applied in the aerospace and mechanical engineering industries to improve the performance characteristics of components made from heat-resistant nickel alloys. References 1. Pollock T.M., Tin S. Nickel-based superalloys for advanced turbine engines: chemistry, microstructure and properties. Journal of Propulsion and Power, 2006, vol. 22 (2), pp. 361–374. DOI: 10.2514/1.18239. 2. Semiatin S.L., McClary K.E., Rollett A.D., Roberts C.G., Payton E.J., Zhang F., Gabb T.P. Microstructure evolution during supersolvus heat treatment of a powder metallurgy nickel-base superalloy. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 2012, vol. 43, pp. 1649–1661. DOI: 10.1007/ s11661-011-1035-y. 3. Zhang J., Huang T., Liu L., Fu H. Advances in solidification characteristics and typical casting defects in nickelbased single crystal superalloys. Acta Metallurgica Sinica, 2015, vol. 51 (10), pp. 1163–1178. DOI: 10.11900/0412.196 1.2015.00448. 4. Fortuna S.V., Gurianov D.A., Kalashnikov K.N., Chumaevskii A.V., Mironov Yu.P., Kolubaev E.A. Directional solidification of a nickel-based superalloy product structure fabricated on stainless steel substrate by electron beam additive manufacturing. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 2021, vol. 52, pp. 857–870. DOI: 10.1007/s11661-020-06090-8. 5. Ivanov D., Travyanov A., Petrovskiy P., Cheverikin V., Alekseeva A., Khvan A., Logachev I. Evolution of structure and properties of the nickel-based alloy EP718 after the SLM growth and after different types of heat and mechanical treatment. Additive Manufacturing, 2017, vol. 18, pp. 269–275. DOI: 10.1016/j.addma.2017.10.015. 6. Babu S.S., Raghavan N., Raplee J., Foster S.J., Frederick C., Haines M., Dinwiddie R., Kirka M.K., Plotkowski A., Lee Y., Dehoff R.R. Additive manufacturing of nickel superalloys: opportunities for innovation and challenges related to qualification. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 2018, vol. 49, pp. 3764–3780. DOI: 10.1007/s11661-018-4702-4. 7. Kulkarni A., Chettri S., Prabhakaran S., Kalainathan S. Effect of laser shock peening without coating on surface morphology and mechanical properties of Nickel-200. Mechanics of Materials Science and Engineering, 2017, vol. 9. DOI: 10.2412/mmse.55.5.304. 8. Carter T.J. Common failures in gas turbine blades. Engineering Failure Analysis, 2005, vol. 12, pp. 237–247. DOI: 10.1016/j.engfailanal.2004.07.004.
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