Wrought intermetallic titanium ortho alloy doped with yttrium

Part 2. Research on heat treatment effect on rolled slab microstructure and mechanical properties
Alexeev E.B., Nochovnaya N.A., Novak A.V., Panin P.V.
UDC
669.295
DOI
10.18577/2307-6046-2018-0-12-37-45
Article PDF (Russian) (852.1 KB)
How to cite
Alexeev E.B., Nochovnaya N.A., Novak A.V., Panin P.V. Wrought intermetallic titanium ortho alloy doped with yttrium. Part 2. Research on heat treatment effect on rolled slab microstructure and mechanical properties // Proceedings of VIAM. 2018. No. 12. DOI: 10.18577/2307-6046-2018-0-12-37-45. URL: https://test.viam.ru/en/journal/2018/12/4
Keywords
intermetallic titanium alloy, ortho-phase Ti2AlNb, rare-earth elements (REE), yttrium, microstructure, heat treatment, mechanical properties.
Abstract

Microstructure of a rolled 35 mm thickness plate (slab) from wrought intermetallic titanium ortho alloy doped with yttrium has been shown, the microstructure being characterized by primary b-grains stretched along rolling direction, and fine precipitations of ordered intermetallic a2 phase located both inside the grains and in grain boundaries.

The influence of two-stage heat treatment (in particular the 1st stage heating temperature) on microstructure and mechanical properties of the rolled plate has been investigated. The first stage heating temperature varied in the range from 890°С to 1010°С with the step of 30°С. All other parameters (process duration, heating and cooling rates) of the two-stage heat treatment remained unchanged. Aging of the samples was performed in a two-phase (О+b/В2)-area with a subsequent cooling in a furnace at a rate of 150°C per hour.

According to the microstructure analysis results, it was observed that the samples from a rolled plate after being subjected to the selected heat treatment modes possess microstructure which is characterized by plate-like O phase particles and globular a2 phase particles in the b/B2 phase matrix. The complete transformation of a2 phase into the O phase does not occur due to the lack of diffusion mobility of atoms upon the selected aging temperature and duration.

It has been shown that the 1st stage heating temperature increase from 920°C to 980°C leads to the dissolution of large primary O phase plates and to the growth of fine secondary lamellar O phase plate-like precipitated within b-grains.

Reference list
  1. Kablov E.N. Materialy novogo pokoleniya – osnova innovatsiy, tekhnologicheskogo liderstva i natsionalnoy bezopasnosti Rossii [Materials of the new generation – the basis of innovation, technological leadership and national security of Russia] // Intellekt i tekhnologii. 2016. №2 (14). S. 16–21.
  2. Titanium and titanium alloys: fundamentals and applications / ed. by C. Leyens, M. Peters. Weinheim: Wiley-VCH Verlag & Co. KGaA, 2003. 513 p.
  3. Chen W., Li J.W., Xu L., Lu B. Development of Ti2AlNb Alloys: Opportunities and Challenges // Advanced Materials and Processes. 2014. Vol. 172. P. 23–27.
  4. Antipov V.V. Perspektivy razvitiya alyuminievyh, magnievyh i titanovyh splavov dlya izdelij aviacionno-kosmicheskoj tehniki [Prospects for development of aluminium, magnesium and titanium alloys for aerospace engineering] // Aviacionnye materialy i tehnologii. 2017. №S. S. 186–194. DOI: 10.18577/2107-9140-2017-0-S-186-194.
  5. Banerjee D., Gogia A.K., Nandy T.K., Joshi V.A. A new ordered orthorhombic phase in a Ti3AlNb alloy // Acta Metallurgica. 1988. Vol. 36. P. 871–882.
  6. Splav na osnove titana i izdelie, vypolnennoe iz nego: pat. 2210612 Ros. Federatsiya. №2001125968/02 [An alloy based on titanium and a product made of it: pat. 2210612 Rus. Federation. No. 2001125968/02]; zayavl. 24.09.01; opubl. 20.08.03.
  7. Intermetallidnyy splav na osnove titana: pat. 2405849 Ros. Federatsiya. №2009139791/02 [Intermetallic alloy based on titanium: pat. 2405849 Rus. Federation. No. 2009139791/02]; zayavl. 28.10.09; opubl. 10.12.10, Byul. №34. 5 s.
  8. Novak A.V., Alekseev E.B., Ivanov V.I., Dzunovich D.A. Izuchenie vliyaniya parametrov zakalki na strukturu i tverdost intermetallidnogo titanovogo orto-splava VTI-4 [The study of the quenching parameters influence on structure and hardness of orthorhombic titanium aluminide alloy VТI-4] // Trudy VIAM: elektron. nauch.-tehnich. zhurn. 2018. №2. St. 05. Available at: http://www.viam-works.ru (accessed: November 23, 2018). DOI: 10.18577/2307-6046-2018-0-2-5-5.
  9. Zhang S.Z. et al. Phase transformation and microstructure evolution of differently processed
  10. Ti–45Al–9Nb–Y alloy // Intermetallics. 2012. Vol. 31. P. 208–216.
  11. Liu Z.G., Chai L.H., Chen Y.Y. Microstructure evolution in rapidly solidified Y added TiAl ribbons // Intermetallics. 2011. Vol. 19. Is. 2. P. 160–164.
  12. Zhao L.L., Li G.Y., Zhang L.Q. Influence of Y addition on the long time oxidation behaviors of high Nb containing TiAl alloys at 900°C // Intermetallics. 2010. Vol. 18. Is. 8. P. 1586–1596.
  13. Chen Y., Si Y., Kong F. Effects of yttrium on microstructures and properties of Ti–17Al–27Nb alloy // Transactions of Nonferrous Metals Society of China. 2006. Vol. 16. Is. 2. P. 316–320.
  14. Li B., Kong F., Chen Y. Effect of Yttrium Addition on Microstructures and Room Temperature Tensile Properties of Ti–47Al Alloy // Journal of Rare Earths. 2006. Vol. 24. Is. 3. P. 352–356.
  15. Chen Y., Li B., Kong F. Microstructural refinement and mechanical properties of Y-bearing TiAl alloys // Journal of Alloys and Compounds. 2008. Vol. 457. Is. 1–2. P. 265–269.
  16. Chen Y., Li B., Kong F. Effects of minor yttrium addition on hot deformability of lamellar
  17. Ti–45Al–5Nb alloy // Transactions of Nonferrous Metals Society of China. 2007. Vol. 17. Is. 1. P. 58–63.
  18. Si Y., Chen Y., Liu Z., Kong F. Influence of yttrium on microstructure and properties of Ti–23Al–25Nb alloy after heat treatment // Transactions of Nonferrous Metals Society of China. 2006. Vol. 16. Supplement 2. P. 849–853.
  19. Chen Y., Kong F., Han J., Chen Z., Tian J. Influence of yttrium on microstructure, mechanical properties and deformability of Ti–43Al–9V alloy // Intermetallics. Vol. 13. Is. 3–4. 2005. P. 263–266.
  20. Chang X., Si J., Gao F., Jing Y., Zhang J. Effect of Gd Addition on Heat Treatment Microstructure of Wought TiAl // Journal of Iron and Steel Research International. 2007. Vol. 14. Is. 5. Supplement 1. P. 26–29.
  21. Lia W., Inksonb B., Horitac Z., Xia K. Microstructure observations in rare earth element
  22. Gd-modified Ti–44 at% Al // Intermetallics. 2000. Vol. 8. Is. 5–6. P. 519–523.
  23. Xia K., Li W., Liu C. Effects of addition of rare earth element Gd on the lamellar grain sizes of a binary Ti–44Al alloy // Scripta Materialia. Vol. 41. Is. 1. 1999. P. 67–73.
  24. Appel F., Paul J.D.H., Oehring M. Gamma titanium aluminide alloys: science and technology. Weinheim: Wiley-VCH Verlag & Co. KGaA, 2011. 745 p.
  25. Shiryaev A.A., Antashev V.G. Osobennosti razrabotki vysokoprochnogo samozakalivaiushchegosia vysokotekhnologichnogo psevdo-β-titanovogo splava [Peculiarities of development of advanced high-strength self-hardening high-processable pseudo-β-titanium alloys] // Aviacionnye materialy i tehnologii. 2014. №4. S. 23–30. DOI: 10.18577/2071-9140-2014-0-4-23-30.
  26. Nochovnaya N.A., Alekseev E.B., Panin P.V., Novak A.V. Issledovanie struktury i mekhanicheskikh svoystv deformiruemogo intermetallidnogo titanovogo splava VIT5, legirovannogo gadoliniem [Study of the structure and mechanical properties of a deformable intermetallic titanium alloy VIT5 doped with gadolinium] // Titan. 2017. №2. S. 21–29.
  27. Kablov E.N., Nochovnaya N.A., Panin P.V., Alekseev E.B., Novak A.V. Issledovanie struktury i svoystv zharoprochnykh splavov na osnove alyuminidov titana s mikrodobavkami gadoliniya [Study of the structure and properties of superalloys based on titanium aluminides with gadolinium microadditives] // Materialovedenie. 2017. №3. S. 3–10.
  28. Nochovnaya N.A., Panin P.V., Alekseev E.B., Novak A.V. Zakonomernosti formirovaniya strukturno-fazovogo sostoyaniya splavov na osnove orto- i gamma-alyuminidov titana v protsesse termomekhanicheskoy obrabotki [Patterns of formation of the structural-phase state of alloys based on titanium ortho- and gamma-aluminides in the process of thermomechanical processing] // Vestnik RFFI. 2015. №1 (85). S. 18–26.
  29. Alekseev Е.B., Nochovnaya N.A., Novak A.V., Panin P.V. Deformiruemyj intermetallidnyj titanovyj orto-splav, legirovannyj ittriem. Chsst 1. Issledovanie mikrostuktury slitka I postroenie reologicheskikh krivykh [Wrought intermetallic titanium ortho alloy doped with yttrium Part 1. Research on ingot microstructure and rheological curves plotting] // Trudy VIAM: elektron. nauch.-tehnich. zhurn. 2018. №6 (66). St. 02. Available at: http://www.viam-works.ru (accessed: November 20, 2018). DOI: 10.18577/2307-6046-2018-0-6-12-21.
  30. Kablov E.N. Innovacionnye razrabotki FGUP «VIAM» GNC RF po realizacii «Strategicheskih napravlenij razvitiya materialov i tehnologij ih pererabotki na period do 2030 goda» [Innovative developments of FSUE «VIAM» SSC of RF on realization of «Strategic directions of the development of materials and technologies of their processing for the period until 2030»] // Aviacionnye materialy i tehnologii. 2015. №1 (34). S. 3–33. DOI: 10.18577/2071-9140-2015-0-1-3-33.
  31. Antipov V.V. Strategiya razvitiya titanovyh, magnievyh, berillievyh i alyuminievyh splavov [Strategy of development of titanium, magnesium, beryllium and aluminum alloys] // Aviacionnye materialy i tehnologii. 2012. №S. S. 157–167.
  32. Kablov E.N. Bez novykh materialov – net budushchego [Without new materials – there is no future] // Metallurg. 2013. №12. S. 4–8.
  33. Nochovnaya N.A., Bazyleva O.A., Kablov D.E., Panin P.V. Intermetallidnye splavy na osnove titana i nikelya / pod obshch. red. E.N. Kablova [Intermetallic alloys on based on titanium and nickel / gen. ed. by E.N. Kablov]. M.: VIAM, 2018. 308 s.