Vibrations in engineering and technology

Stadnik Mykola – Doctor of Technical Sciences, Associate Professor, Professor of the Department of Electric Power, Electrical Engineering and Electromechanics of Vinnytsia National Agrarian University (3, Sonyachna St., Vinnytsia, 21008, Ukraine. e-mail: stadnik_mykola@vsau.vin.ua ). 

Trukhanska Olena – Candidate of Technical Sciences, Associate Professor of the Department of Agricultural Engineering and Technical Service of Vinnytsia National Agrarian University (St. Soniachna, 3, Vinnytsia, Ukraine, 21008, e-mail: yaropud77@gmail.com).

Bubnovska Iryna – Candidate of Technical Sciences, Senior Lecturer at the Department of Mathematics, Physics and Computer Technologies of Vinnytsia National Agrarian University (St. Soniachna, 3, Vinnytsia, Ukraine, 21008, e-mail: biana25100@gmail.com).

Kupchuk Ihor – Candidate of Technical Sciences, Associate professor, Associate Professor of the Department of Engineering Mechanics and Technological Processes in the Agricultural Industry, Faculty of Engineering and Technology, Vinnytsia National Agrarian University (3, Sonychna St., Vinnytsia, 21008, Ukraine, e-mail: kupchuk.igor@i.ua; http://orcid.org/0000-0002-2973-6914).

The paper investigates the influence of the main parameters of hot rolling—namely the initial deformation temperature, roll rotational speed, degree of deformation, and groove geometry—on the formation of quality, profile accuracy, and the micro- and macrostructure of billets intended for compressor blades of gas turbine engines. It is established that for heat-resistant steels and titanium alloys, the decisive factor is the rational combination of deformation temperature and rolling speed, as these parameters govern the intensity of recrystallization, grain refinement, accumulation of plastic deformation, and thermal gradients in the metal–roll contact zone.

Mathematical modeling of the stress–strain state was performed using the finite element method with a “round–oval” groove scheme, which made it possible to trace the evolution of strain intensity, energy density, and temperature fields at different stages of billet passage through the groove. Analytical and experimental studies demonstrated that an optimal range of temperature and deformation degree ensures a reduction in structural inhomogeneity by 20–35%, lowers the risk of central defect formation, and improves the macrostructure due to the intensification of dynamic recrystallization.

A comparative analysis of hot and cold rolling showed that hot deformation significantly reduces force loads, enables processing of heat-resistant and complex-alloyed materials, and promotes the formation of a uniform equiaxed grain structure. In contrast, cold rolling provides high profile accuracy but is accompanied by increased hardness and residual stresses, which may limit further plastic deformation. Based on the obtained results, recommendations are formulated for selecting hot rolling regimes aimed at increasing the service life and operational reliability of compressor blades.

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2. Hosford, W. F., & Caddell, R. M. (2014).  Metal Forming: Mechanics and Metallurgy. Cambridge University Press. [in English].

3. Zhou, J., & Lin, J. (2019). FE Modelling of Thermomechanical Rolling Processes for Aerospace Alloys. International Journal of Mechanical Sciences, 2019. [in English].

4. Semiatin, S. L. (2015).  Metallic Materials: Thermomechanical Processing. ASM International. [in English].

5. Reed, R. C. (2008).  The Superalloys: Fundamentals and Applications. Cambridge University Press. [in English]. 

6. Utsunomiya, H., & Yoshida. (2017).  “Microstructural Evolution in Hot Rolling of Ti-6Al-4V Alloy.” Journal of Materials Processing Technology. [in English].

7. Matviychuk V.A., Bubnovska I.A. (2015). Modeling of temperature and deformation fields in hot deformation processes. DSMA. [in Ukrainian].

8. Kryshchuk N.G., Gunko I.V. (2019). Deformation processes in shaped gauges during hot rolling. Pressure processing of materials. [in Ukrainian].

9. Skryabin S.A., Kryshchuk N.G., Gunko I.V. (2011). Thermal processes and thermal deformations during rolling of blanks. Processing of materials by pressure. [in Ukrainian].