Influence of surface treatment technology on the fatigue strength of VT8 alloy

Keywords

wire electrical discharge machining, chemical polishing, titanium alloy, multi-cycle fatigue, profilometry.

Cite as

Chuchman M. R., Vasyliv Ch. B., Mardarevych R. S., Torba Yu. I., Podobnyi O. V., Nemanyezhyn Ye. O., and Kovalchyk Yu. I. Influence of surface treatment technology on the fatigue strength of VT8 alloy. Physicochemical Mechanics of Materials. 2026. 62(2), 128-133.

https://doi.org/10.15407/pcmm2026.02.128

Abstract

A device for multi-cycle fatigue testing of metals is developed. The influence of technological processing on the surface quality and fatigue strength of the Ti–6Al–3Mo alloy has been established. It is shown that after milling and single-shot wire electrical discharge machining (WEDM), the parameters of the alloy surface profile are worse than the regulatory requirements, and the fatigue strength does not exceed 191 MPa. The сhemical polishing of Ti–6Al–3Mo alloy made by single-shot WEDM eliminates the surface defect zone (Ra = 0.2–0.3 μm and Rv = –1.2 μm), which contributes to an increase in its fatigue limit in two times compared to unpolished samples.

References

1. J. Buk, P. Sułkowicz, and D. Szeliga, “The review of current and proposed methods of manu-facturing fir tree slots of turbine aero engine discs,” Materials, 16, Is. 14 (2023). Art. no. 5143. https://doi.org/10.3390/ma16145143
2. P. Vogtel, F. Klocke, and D. Lung, “High performance machining of profiled slots in nickel-based-superalloys,” Procedia CIRP, 14, 54-59 (2014). https://doi.org/10.1016/j.procir.2014.03.061
3. O. Dvirna, “Analysis of applied technologies of surface treatment locks grape compressor and turbine,” Zesz. Nauk. Politech. Rzesz., 90, 433-440 (2018). https://doi.org/10.7862/rm.2018.37
4. D.T. Curtis, S.L. Soo, D.K. Aspinwall, and C. Sage, “Electrochemical superabrasive machining of a nickel-based aeroengine alloy using mounted grinding points,” CIRP Ann. Manuf. Technol., 58, 173-176 (2009). https://doi.org/10.1016/j.cirp.2009.03.074
5. Ch.B. Vasyliv, M.S. Khoma, M.R. Chuchman, Yu.I. Torba, O.V. Podobnyi, Ye.О. Ne-manezhyn, and O.E. Narivskyi, “Alternative methods for forming complex-shaped surfaces on gas turbine engine parts,” Mater. Sci., 61, Is. 2, 186-191 (2025). https://doi.org/10.1007/s11003-025-00978-9
6. V.I. Pokhmurskyi, and M.S. Khoma, Corrosion Fatigue of Metals and Alloys [in Ukrainian], Spolom, Lviv (2008).
7. O.V. Maksymiv, V.I. Kyryliv, T.M. Krevchyshyn, B.P. Chaikovskyi, and I.H. Yaroshovych, “Influence of surface nanostructure alloying on ShKh15 steel contact fatigue,” Mater. Sci., 61, Is. 5, 607-613 (2025). https://doi.org/10.1007/s11003-026-01031-z
8. M. Bembenek, V. Kopei, L. Ropyak, and K. Levchuk, “Stressed state of chrome parts during diamond burnishing,” Metallofizika i Noveishie Tekhnologii [in Russian], 45, Is. 2, 239-250 (2023). https://doi.org/10.15407/mfint.45.02.0239
9. D.A. Lesyk, B.M. Mordyuk, W. Alnusirat, S. Martinez, V.V. Dzhemelinskyi, O.O. Honcharuk, P.V. Kondrashev, Yu.V. Kliuchnykov, and A. Lamikiz, “Ultrasonic surface finishing of AISI 1045 steel hardened by laser heat treatment with fibre laser and scanning optics: layered-structure-induced hardening and enhanced surface mor-phology,” Progress in Physics of Metals, 25, Is. 4, 822-867 (2024). https://doi.org/10.15407/ufm.25.04.822
10. I.P. Shatskyi, L.Y. Ropyak, and M.V. Makoviichuk, “Strength optimization of a two-layer coating for the particular local loading conditions,” Strength of Materials, 48, Is. 5, 726-730 (2016). https://doi.org/10.1007/s11223-016-9817-5
11. V.R. Ivashkiv, Ch.B. Vasyliv, M.P. Chuchman, R.S. Mardarevych, B.M. Datsko, N.B. Ratska, Yu.I. Torba, O.V. Podobnyi, and Ye.O. Nemanezhyn, “The effect of chemical and electrochemical polishing on the quality of Ti-6Al-3Mo alloy surface after Wire electroerosion cutting,” Mater. Sci., 61, Is. 4, 605-612 (2025). https://doi.org/10.1007/s11003-026-01023-z