Impact strength of VT6 titanium alloy with the ultra-fine grain structure produced by the equal-channel angular pressing method

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Abstract

The wide use of two-phase titanium alloys in aircraft engine building, as well as the intense development of this industry, stipulate more and more stringent requirements to structural materials and the enhancement of their reliability, strength and performance characteristics. The formation of an ultrafine-grained (UFG) state in metals and alloys using severe plastic deformation (SPD) processing enables achieving high strength properties. However, an important aspect of UFG materials is their structural and textural effects which may lead to a strong anisotropy of their properties. In this respect, the authors studied the effect of microstructural features on the mechanical properties and impact toughness of the VT6 alloy after equal-channel angular pressing (ECAP) and subsequent deformation by upsetting, imitating die forging. The study showed that the formation of a UFG structure in the VT6 titanium alloy with a grain size of about 0.4 µm allows increasing the ultimate tensile strength up to 1250 MPa. The additional upsetting of the UFG alloy at T=750 °C leads to grain growth up to 0.5–1 µm and a decline in strength to 1090 MPa as a result of the recovery and recrystallization processes. Impact toughness tests were conducted on specimens with a V-shaped stress raiser at room temperature, showing that the impact toughness of the UFG VT6 alloy was 0.41 MJ/m2. The tests revealed the anisotropy of impact toughness in the UFG VT6 alloy after equal-channel angular pressing and additional upsetting due to the metallographic and crystallographic texture formed as the result of deformation treatment. In test direction No. 1, the impact toughness value is the lowest and equals 0.31 MJ/m2.

About the authors

Iuliia M. Modina

Ufa State Aviation Technical University, Ufa

Author for correspondence.
Email: modina_yulia@mail.ru
ORCID iD: 0000-0002-7836-3990

PhD (Engineering), junior researcher

Россия

Grigory S. Dyakonov

Ufa State Aviation Technical University, Ufa

Email: dgr84@mail.ru
ORCID iD: 0000-0001-5389-5547

PhD (Engineering), researcher

Россия

Andrey G. Stotskiy

Ufa State Aviation Technical University, Ufa

Email: stockii_andrei@mail.ru
ORCID iD: 0000-0002-2667-1115

junior researcher

Россия

Danil T. Miftakhov

Ufa State Aviation Technical University, Ufa

Email: danil.miftahow@yandex.ru

operator of electronic-computer and computing machines

Россия

Irina P. Semenova

Ufa State Aviation Technical University, Ufa

Email: semenova-ip@mail.ru
ORCID iD: 0000-0002-1857-9909

Doctor of Sciences (Engineering), leading researcher

Россия

References

  1. Mao Q., Liu Y., Zhao Y. A review on mechanical properties and microstructure of ultrafine grained metals and alloys processed by rotary swaging. Journal of Alloys and Compounds, 2022, vol. 896, article number 163122. doi: 10.1016/j.jallcom.2021.163122.
  2. Vinogradov A. Mechanical properties of ultrafine-grained metals: new challenges and perspectives. Advanced Engineering Materials, 2015, vol. 17, no. 12, pp. 1710–1722. doi: 10.1002/adem.201500177.
  3. Estrin Y., Vinogradov A. Fatigue behaviour of light alloys with ultrafine grain structure produced by severe plastic deformation: An overview. International Journal of Fatigue, 2010, vol. 32, no. 6, pp. 898–907. doi: 10.1016/j.ijfatigue.2009.06.022.
  4. Valiev R.Z. Nanostructuring of metals by severe plastic deformation for advanced properties. Nature Materials, 2004, vol. 3, no. 8, pp. 511–516. doi: 10.1038/NMAT1180.
  5. Meyers M.A., Mishra A., Benson D.J. Mechanical properties of nanocrystalline materials. Progress in Materials Science, 2006, vol. 51, no. 4, pp. 427–556. doi: 10.1016/J.PMATSCI.2005.08.003.
  6. Langdon T.G., Furukawa M., Horita Z., Nemoto M. Using intense plastic straining for high-strain-rate superplasticity. JOM, 1998, vol. 50, no. 6, pp. 41–45. doi: 10.1007/S11837-998-0126-8.
  7. Zhao Y., Liu J., Topping T.D., Lavernia E.J. Precipitation and aging phenomena in an ultrafine grained Al-Zn alloy by severe plastic deformation. Journal of Alloys and Compounds, 2021, vol. 851, article number 156931. doi: 10.1016/j.jallcom.2020.156931.
  8. Valiev R.Z., Zhilyaev A.P., Lengdon T.Dzh. Obemnye nanostrukturnye materialy: fundamentalnye osnovy i primeneniya [Bulk nanostructured materials: fundamentals and applications]. Sankt Petersburg, Eko-Vektor Publ., 2017. 479 p.
  9. Edalati K., Bachmaier A., Beloshenko V.A., Beygelzimer Y., Blank V.D., Botta W.J., Bryla K., Cizek J., Divinski S., Enikeev N.A., Estrin Y., Faraji G. Nanomaterials by severe plastic deformation: review of historical developments and recent advances. Materials Research Letters, 2022, vol. 10, no. 4, pp. 163–256. doi: 10.1080/21663831.2022.2029779.
  10. Suwas S., Ray R.K. Crystallographic texture of materials. London, Springer London Publ., 2014. 260 p.
  11. Sitdikov V.D., Alexandrov I.V., Ganiev M.M., Fakhretdinova E.I., Raab G.I. Effect of temperature on the evolution of structure, crystallographic texture and the anisotropy of strength properties in the Ti Grade 4 alloy during continuous ECAP. Reviews on Advanced Materials Science, 2015, vol. 41, no. 1, pp. 44–51.
  12. Wagner F., Ouarem A., Richeton T., Toth L.S. Improving Mechanical Properties of cp Titanium by Heat Treatment Optimization. Advanced Engineering Materials, 2018, vol. 20, no. 4, article number 1700237. doi: 10.1002/adem.201700237.
  13. Richeton T., Wagner F., Chen C., Toth L.S. Combined effects of texture and grain size distribution on the tensile behavior of α-titanium. Materials, 2018, vol. 11, no. 7, article number 1088. doi: 10.3390/ma11071088.
  14. Boyer R., Welsch G., Collings E.W. Materials Properties Handbook: Titanium Alloys. USA, ASM International Publ., 1998. 1048 p.
  15. Moiseyev V.N. Titanium alloys in Russia: Russian Aircraft and Aerospace Applications. Boca Raton, CRC Press Publ., 2005. 216 p.
  16. Ermachenko A.G., Lutfullin R.Ya., Mulyukov R.R. Advanced Technologies of Processing Titanium Alloys and Their Applications in Industry. Reviews on Advanced Materials Science, 2011, vol. 29, no. 1, pp. 68–82.
  17. Semenova I.P., Dyakonov G.S., Raab G.I., Grishina Y.F., Huang Y., Langdon T.G. Features of Duplex Microstructural Evolution and Mechanical Behavior in the Titanium Alloy Processed by Equal-Channel Angular Pressing. Advanced Engineering Materials, 2018, vol. 20, no. 8, article number 1700813. doi: 10.1002/adem.201700813.
  18. Zherebtsov S.V., Kudryavtsev E.A., Salishchev G.A., Straumal B.B., Semiatin S.L. Microstructure evolution and mechanical behavior of ultrafine Ti-6Al-4V during low temperature superplastic deformation. Acta Materialia, 2016, vol. 121, pp. 152–163. doi: 10.1016/J.ACTAMAT.2016.09.003.
  19. Dyakonov G.S., Semenova I.P., Lopatin N.V., Grishina Y.F., Melemchuk I.A. Microstructure evolution of titanium alloy VT8М-1 with globular-lamellar structure during deformation in temperature range of 650–800° С. Inorganic Materials: Applied Research, 2017, vol. 8, no. 1, pp. 1–6. doi: 10.1134/S2075113317010129.
  20. Zherebtsov S.V., Kudryavtsev E., Kostjuchenko S., Malysheva S., Salishchev G. Strength and ductility-related properties of ultrafine grained two-phase titanium alloy produced by warm multiaxial forging. Materials Science and Engineering A, 2012, vol. 536, pp. 190–196. doi: 10.1016/J.MSEA.2011.12.102.

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