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Solid-phase metallurgy in compressor blade manufacturing: effect of ultrasonic strengthening on surface layer properties

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Category: Content №1 2026

Last Updated on 27 February 2026

Published on 30 November -0001

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Authors:

D. Pavlenko*, orcid.org/0000-0001-6376-2879, National University “Zaporizhzhia Polytechnic”,

Zaporizhzhia, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Y. Vyshnepolskyi, orcid.org/0000-0002-8048-7976, National University “Zaporizhzhia Polytechnic”, Zaporizhzhia, Ukraine

I. Fedorov, orcid.org/0009-0000-3146-8528, National University “Zaporizhzhia Polytechnic”,

Zaporizhzhia, Ukraine

M. Schetinina, orcid.org/0000-0003-0345-2048, National University “Zaporizhzhia Polytechnic”,

Zaporizhzhia, Ukraine

Y. Torba, orcid.org/0000-0001-8470-9049, State Enterprise “Ivchenko-Progres”, Zaporizhzhia, Ukraine

* Corresponding author e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2026, (1): 043 - 049

https://doi.org/10.33271/nvngu/2026-1/043

Abstract:

Purpose. To establish the influence of ultrasonic strengthening with steel balls on surface roughness, residual stresses, microhardness, and surface layer structure of compressor blades manufactured from titanium alloy blanks produced by solid-phase powder metallurgy technology.

Methodology. The study employed specimens manufactured from a powder mixture of VT8-grade titanium alloy components, using the intensive consolidation method – twist extrusion. Blade profile machining was performed by high-speed milling on a 5-axis machining centre. Ultrasonic treatment of specimen surfaces was conducted using steel balls with a 1.6 mm diameter and a hardness of HRC 62-66. Residual stress measurements in the surface layer were performed using the hole-drilling method, microhardness distribution was determined on bevelled sections, and surface profile examination was carried out using a digital profilometer.

Findings. It was established that strain hardening of the surface layer with steel balls in an ultrasonic field for 15 minutes ensures maximum compressive residual stresses in the surface layer (515 to 520 MPa at a depth of 18‒20 m), uniform distribution of microhardness, and surface roughness not exceeding 0.4 µm. Increasing the treatment time leads to over-hardening and surface degradation. The structure of the treated layer retains the equiaxed bimodal character typical of VT8 titanium alloy.

Originality. For the first time, quantitative relationships have been established between ultrasonic strengthening parameters with steel balls and the stress-strain state, microhardness, roughness, and work-hardening depth of VT8 titanium alloy produced by solid-phase synthesis technology. Scientifically substantiated technological treatment parameters are proposed to ensure the formation of optimal surface layer properties for enhancing the durability of gas turbine engine blades.

Practical value. The proposed technological treatment parameters can be utilized in serial production or repair of gas turbine engine components, particularly in the aviation industry.

Keywords: solid-phase metallurgy, severe plastic deformation, structure, blades, residual stresses, microhardness

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