Polzunov Altai State Technical University (Barnaul, Russia)

E. A. Pismennyi, Postgraduate Student of the Dept. “Engineering Technology”, e-mail: pismennyi.eug@mail.ru
A. M. Markov, Dr. Eng., Prof., Rector, Dept. “Engineering Technology”, e-mail: andmarkov@inbox.ru
A. I. Augstkaln, Postgraduate Student of the Dept. of Physics, Assistant of the Dept. of Mechanical Engineering
Technologies and Equipment, e-mail: Augstkaln-a@yandex.ru

Wuhan Textile University (Wuhan, China)¹ ; Vladimir State University named after Alexander and Nikolay Stoletovs (Vladimir, Russia)² ; National University of Science and Technology MISIS (Moscow, Russia)³
V. B. Deev^*, Dr. Eng., Prof., School of Mechanical Engineering and Automation¹, Chief Researcher², Prof. of the
Dept. of Metal Forming³, e-mail: deev.vb@mail.ru

^*Corresponding author

The attainment of the necessary mechanical and operational properties in cast steels typically involves heat treatment, leading to a consequent increase in the final part’s cost by 30–60 %. In this study, we have enhanced the heat treatment process for cast steel 50SL, streamlining the entire procedure into a single cycle rather than the conventional two-cycle method required for cast steels. This process involves homogenization annealing followed by subsequent quenching through reheating, alongside appropriate tempering to achieve the desired mechanical and operational characteristics. Through our research, it was demonstrated that the optimal heat treatment regimen for cast components of railway cars involves heating to 950 °C, maintaining this temperature, followed by controlled cooling in a furnace to 850 °C, with a brief hold before final cooling in water. Subsequent tempering is conducted at 350 °C for 2 hours. This refined heat treatment protocol, consolidated into a single thermal heating process, significantly reduces the duration of the entire heat treatment cycle by 2.4 times and slashes costs by a factor of 4. Consequently, products fabricated from steel 50SL exhibit mechanical properties 10–12 % superior to those achieved through the conventional heat treatment approach, comprising annealing with furnace cooling, reheating for quenching, and subsequent tempering.

The research was carried out within the state assignment in the field of scientific activity of the Ministry of Science and Higher Education of the Russian Federation (theme FZUN-2024-0004, state assignment of the VlSU).

1. Sun Y. Q., Cole C. Vertical dynamic behavior of three-piece bogie suspensions with two types of friction wedge. Multibody System Dynamics. 2008. Vol. 19. pp. 365–382. DOI: 10.1007/s11044-007-9085-z
2. Xu X., Fu M., Xu Z., Chen Z. A new lever-type variable friction damper for freight bogies used in heavy haul railway. Journal of Modern Transportation. 2016. Vol. 24. pp. 159–165. DOI: 10.1007/s40534-016-0116-4
3. Yadav O. P., Vyas N. S. The influence of AAR coupler features on estimation of in-train forces. Railway Engineering Science. 2023. Vol. 31. pp. 233–251. DOI: 10.1007/s40534-022-00297-8
4. Stichel S. Limit Cycle Behaviour and Chaotic Motions of Two-Axle Freight Wagons with Friction Damping. Multibody System Dynamics. 2002. Vol. 8. pp. 243–255. DOI: 10.1023/A:1020990128895
5. Ron’zhin I., Barinova G. P., Grinshpon A. S., Demin Yu. S., Maksimov S. G., Filippov G. A., Kononov A. A. Features of the production of railroad wheels with more durable rims. Metallurgist. 2002. Vol. 46. Nos. 11–12. pp. 340–343.

6. Wu Q., Luo S., Cole C. Longitudinal dynamics and energy analysis for heavy haul trains. Journal of Modern Transportation. 2014. Vol. 22. pp. 127–136. DOI: 10.1007/s40534-014-0055-x
7. A913/A913M-11: Standard Specification for High-Strength Low-Alloy Steel Shapes of Structural Quality, Produced by Quenching and Self-Tempering Process (QST). ASTM International, 2011, West Conshohocken.
8. Soldatov V. G., Manuev M. S., Ivashchenkov Y. M., Tupatilov E. A. Optimization of properties of steel 20GL for railway transport castings. Metal Science and Heat Treatment. 2007. Vol. 49. p. 417–419. DOI: 10.1007/s11041-007-0079-5
9. Lebedinskii S. G., Barmina O. V. Analysis of Survivability of Cast Railroad Parts under Operational Loading. Journal of Machinery Manufacture and Reliability. 2023. Vol. 52. pp. 486–491. DOI: 10.3103/S1052618823050114
10. Lebedinskii S. G. Operating Life of Steel in Cast Parts of Rail Transport. Journal of Machinery Manufacture and Reliability. 2022. Vol. 51 (Suppl. 1). S36–S41. DOI: 10.3103/S1052618822090096
11. Bulbuc V., Paleu V., Pricop B., Popa M., Cârlescu V., Cimpoesu N., Bujoreanu L. G. Effects of Dynamic Loading under Extreme Conditions on Wear Resistance of T105Mn120 Castings for Railway Safety Systems. Journal of Materials Engineering and Performance. 2021. Vol. 30. pp. 7128–7137. DOI: 10.1007/s11665-021-05837-7
12. Gabets D. A., Markov A. M., Pismenny E. A., Chertovskikh E. O. Utility model patent No. 194823 of the Russian Federation. Friction wedge of a railway car bogie. No. 1019133574; appl. 10/22/2019; publ. 12/24/2019.
13. Gabets D. A., Gabets A. V., Levkin I. V., Chertovskikh E. O. Certificate of registration of a computer program No. 1020619875.
CAD model of the concept of a friction wedge for a freight car bogie. No. 1020618630; appl. 08/06/2020; publ. 08/25/2020.
14. Verdeja González J. I., Fernández-González D., Verdeja González L. F. Physical Metallurgy and Heat Treatment of Steel. Springer Cham. 2023. 332 p. DOI: 10.1007/978-3-031-05702-1
15. Berns H., Theisen W. Ferrous Materials. Steel and Cast Iron. Springer Berlin, Heidelberg. 2008. 418 p. DOI: 10.1007/978-3-540-71848-2
16. Totten G. E. Steel Heat Treatment Handbook. 2^nd Edition. CRC Press, 2006. 1576 p.
17. ASM Handbook, Vol. 4: Heat Treatment. ASM International, American Society for Metals Park, Ohio. 1991. 2173 p.
18. ASM Handbook, Vol. 9: Metallography and Microstructures. ASM International, American Society for Metals Park, Ohio. 2004. pp. 493–512. DOI: 10.1361/asmhba0003752
19. Kazakov A. A., Ryaboshuk S. V., Lyubochko D. A., Chigintsev L. S. Research on the Origin of Nonmetallic Inclusions in High-Strength Low-Alloy Steel Using Automated Feature Analysis. Microscopy and Microanalysis. 2015. Vol. 21. No. 3. pp. 1755–1756. DOI: 10.1017/S1431927615009551
20. Kazakov A., Kovalev S., Ryaboshuk S. Metallurgical expertise as the base for determination of nature of defects in metal products. CIS Iron and Steel Review. 2007. Vol. 2. pp. 7–13.