Ural Federal University named after the First President of Russia B. N. Yeltsin, Yekaterinburg, Russia:

A. G. Illarionov, Associate Professor at the Department of Heat Treatment and Metal Physics, Institute of New Materials and Technologies, Candidate of Technical Sciences, e-mail: a.g.illarionov@urfu.ru
F. V. Vodolazskiy, Associate Professor at the Department of Heat Treatment and Metal Physics, Institute of New Materials and Technologies, Candidate of Technical Sciences, e-mail: f.v.vodolazskiy@urfu.ru

Ural Research Institute of the Tube & Pipe Industries JSC (RusNITI), Chelyabinsk, Russia:
Ya. I. Kosmatskiy, Deputy Head of Seamless Tube Department, Department of Tube Technology, Head of the Pipe Drawing and Pressing Laboratory, Responsible for International Contracts, Candidate of Technical Sciences,
e-mail: kosmatski@rosniti.ru

TMK’s Research & Development Centre, Moscow, Russia¹ ; South Ural State University, Chelyabinsk, Russia²:
E. A. Gornostaeva, Junior Researcher at the Laboratory of Materials Engineering and Welding¹, Postgraduate Student at the Department of Materials Science and Physical Chemistry of Materials², e-mail: GornostaevaEA@tmk-group.com

This paper describes the results of a study that looked at alloy PT-1M that refers to the Ti – Al system and the α-alloys of titanium and is used to make tubes for various applications, including tubes that are hot-pressed as part of the manufacturing process. When developing a procedure for making hot-pressed tubes, one should first determine the temperatures and forces of the pressing operation that would ensure production of quality semifinished tubes. By means of test quenching operations, optical microscopy, thermodynamic analysis performed in ThermoCalc and physical modelling of the hot deformation process carried out in Gleeble 3800, as well as a series of mathematical calculations, the authors were able to determine the polymorphic α + β → β transformation temperature, as well as temperature regions of heating and forces that are necessary for hot pressing of the titanium alloy PT-1M for producing tubes of a given size at the TMK Group facilities. Having analyzed the temperature region of the α + β → β transformation in alloy PT-1M through thermodynamic calculation in ThermoCalc, the authors came up with recommended test temperatures for the PT-1M alloy for estimating the hot deformation forces required. The authors simulated the process of hot deformation by compressing specimens of the PT-1M alloy in the recommended temperature range, explained how the forces changed as a function of temperature and true deformation rate and determined the maximum forces and the strain-induced heating. The calculations show that, in the temperature range recommended for pressing tubes of a given size from PT-1M workpieces, the peak loads do not exceed the capacity of the pipe press in view.
This research was funded by the Russian Science Foundation (Project No. 18-79-10107).

1. Gorynin I. V., Ushkov S. S., Khatuntsev A. N., Loshakova N. I. Titanium alloys for marine machinery. Saint Petersburg : Politekhnika, 2007. 387 p.
2. OST 1 92077–91. Titanium alloys. Grades. Introduced: 01.01.1992.
3. Ilyin A. A., Kolachev B. A., Polkin I. S. Titanium alloys. Composition, structure, properties: Reference book. Moscow : VILS-MATI, 2009. 520 p.
4. Illarionov A. G., Kosmatskiy Ya. I., Filyaeva E. A. et al. Conducting experiments to determine the temperature parameters for analyzing the possibility to make hot-pressed tubes out of alloy Ti – 3Al – 2.5V. Metallurg. 2016. No. 9. pp. 83–87.
5. Pyshmintsev I. Yu., Kosmatskiy Ya. I., Filyaeva E. A. et al. Hot-pressed tubes made of alloy Ti–3Al–2.5V: Structure and properties of the metal. Metallurg. 2018. No. 4. pp. 70–75.
6. Banerjee D., Williams J. C. Perspectives on titanium science and technology. Acta Materialia. 2013. Vol. 61. pp. 844–879.
7. Aleksandrov V. K., Anoshkin N. F., Belov A. F. et al. Semi-finished products made of titanium alloys. Moscow : ONTI VILS, 1996. 584 p.
8. A. P. Anisimov, V. V. Antipov, V. N. Kopylov, L. P. Rtishcheva, V. G. Smirnov, A. A. Kharin. Method for manufacturing spiral ribbed pipes. Patent RF, No. WO 2016068748 A1. Published: 06.05.16.
9. Chukhina E. V., Sholokhova A. Yu., Zhelnina A. V., Illarionov A. G. Application of Thermocalc for calculating the polymorphic (α + β) – β transformation temperature in a dual-phase titanium alloy. Proceedings of the 17^th International Workshop for Young Metallurgists. 2016. Vol. 2. pp. 314–317.
10. Zhao D., Ebel T., Yan M., Qian M. Trace carbon in biomedical beta-titanium alloys: Recent Progress. JOM. 2015. Vol. 67, No. 10. pp. 2236–2243.
11. Kosmatskiy Ya. I., Barichko B. V., Panova K. Yu. Pressing technology: Learner’s guide. Chelyabinsk : Izdatelstvo YuUrGU, 2011. 70 p.
12. Kolachev B. A., Egorova Yu. B., Belova S. B. On the relationship between the α + β → β transition temperature of commercial titanium alloys and their chemical composition. Metallovedenie i termicheskaya obrabotka metallov. 2008. No. 8. pp. 10–14.
13. Qiang Liao, Chao Deng, Heng-lei Qu, Ya-she Yang, Li Nan et al. Effect of Deformation rate on microstructure and tensile properties of cold rolled Ti – 3Al – 2,5V alloy tube. Ti 2011 – Proceedings of the 12^th World Conference on Titanium. 2012. Vol. 1. pp. 278–281.
14. Hammond C., Nutting J. The physical metallurgy of superalloys and titanium alloys. Metal Science. 1977. Vol. 11, No. 10. pp. 474–490.
15. Nikolskiy L. A., Figlin S. Z., Boytsov V. V. et al. Hot forging and pressing of titanium alloys. Moscow : Mashinostroenie, 1975. 285 p.
16. Kosmatskiy Ya. I., Filyaeva E. A., Fokin N. V., Yakovleva K. Yu. Understanding if it would be technically possible to produce TREX seamless tubes of a new type out of alloy Ti–3Al–2.5V. Kachestvo v obrabotke materialov. 2016. Iss. No. 2. pp. 15–22.
17. Glazunov S. G., Moiseev V. N. Structural titanium alloys. Moscow : Metallurgiya, 1974. 368 p.