Microstructure and strength of a 3D-printed Ti–6Al–4V alloy subjected to high-pressure torsion

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Currently, one of the effective 3D printing methods is wire-feed electron-beam additive manufacturing (EBAM), which allows producing large-sized commercial billets from Ti–6Al–4V titanium alloy. However, Ti–6Al–4V alloy produced by this method demonstrates reduced strength properties. It is known that it is possible to increase the strength properties of metallic materials by refining their grain structure by high-pressure torsion (HPT). This work is aimed at studying the influence of high-pressure torsion on the microstructure, and mechanical strength of a structural Ti–6Al–4V titanium alloy produced by the wire-feed electron-beam additive manufacturing method. The microstructure of a 3D-printed Ti–6Al–4V alloy in the initial state, and after high-pressure torsion, was studied using optical, scanning and transmission electron microscopy. An EBSD analysis of the material in its original state was carried out. The microhardness of the material in the initial and deformed states was measured. Using the dependence of the yield strength on microhardness, the estimated mechanical strength of the material after processing by the high-pressure torsion method was determined. The microstructural features of the 3D-printed Ti–6Al–4V alloy after high-pressure torsion, which provide increased strength of this material, are discussed. The research results demonstrate that 3D printing, using the electron-beam additive manufacturing method, allows producing a Ti–6Al–4V titanium alloy with a microstructure unusual for this material, which consists of columnar primary β-grains with a transverse size of 1–2 mm, inside of which martensitic α'-Ti needles are located. Thin β-Ti layers with a thickness of about 200 nm are observed between the α'-Ti needles. Further deformation treatment of the alloy, using the high-pressure torsion method, allowed forming an ultrafine-grained structure in its volume, presumably consisting of α-grains with an average size of (25±10) nm. High-pressure torsion of the 3D-printed alloy allowed achieving rather high microhardness values of (448±5) НV0.1, which, according to the HV=2.8–3σy ratio, corresponds to the estimated yield strength of approximately 1460 MPa.

About the authors

Emi I. Usmanov

Ufa University of Science and Technology

Author for correspondence.
Email: usmanovei@uust.ru
ORCID iD: 0000-0002-1725-4651

engineer of the Research Institute of Physics of Advanced Materials

Россия, 450076, Russia, Ufa, Zaki Validi Street, 32

Yana N. Savina

Ufa University of Science and Technology

Email: savina.yana18@yandex.ru
ORCID iD: 0000-0003-1387-8819

research engineer of the Research Institute of Physics of Advanced Materials

Россия, 450076, Russia, Ufa, Zaki Validi Street, 32

Roman R. Valiev

Ufa University of Science and Technology

Email: rovaliev@gmail.com
ORCID iD: 0000-0003-1584-2385

PhD (Engineering), senior researcher of the Research Institute of Physics of Advanced Materials

Россия, 450076, Russia, Ufa, Zaki Validi Street, 32

References

  1. Valiev R.Z., Zhilyaev A.P., Langdon T.G. Bulk Nanostructured Materials: Fundamentals and Applications. New Jersey, John Wiley & Sons Publ., 2013. 468 p.
  2. Horita Z., Edalati K. Severe Plastic Deformation for Nanostructure Controls. Materials Transactions, 2020, vol. 61, no. 11, pp. 2241–2247. doi: 10.2320/matertrans.MT-M2020134.
  3. Valiev R.Z., Straumal B., Langdon T.G. Using Severe Plastic Deformation to Produce Nanostructured Materials with Superior Properties. Annual Review of Materials Research, 2022, vol. 52, pp. 357–382. doi: 10.1146/annurev-matsci-081720-123248.
  4. Valiev R.R., Lomakin I.V., Stotskiy A.G., Modina Yu.M., Shafranov P.G., Gadzhiev F.A. Enhanced strength and ductility of an ultrafine-grained Ti alloy processed by HPT. Defect and Diffusion Forum, 2018, vol. 385, pp. 331–336. doi: 10.4028/ href='www.scientific.net/DDF.385.331' target='_blank'>www.scientific.net/DDF.385.331.
  5. Deng Guanyu, Zhao Xing, Su Lihong, Wei Peitang, Zhang Liang, Zhan Lihua, Chong Yan, Zhu Hongtao, Tsuji Nobuhiro. Effect of high pressure torsion process on the microhardness, microstructure and tribological property of Ti6Al4V alloy. Journal of Materials Science & Technology, 2021, vol. 94, pp. 183–195. doi: 10.1016/j.jmst.2021.03.044.
  6. Shahmir H., Naghdi F., Pereira P.H.R., Yi Huang, Langdon T.G. Factors influencing superplasticity in the Ti-6Al-4V alloy processed by high-pressure torsion. Materials Science and Engineering: A, 2018, vol. 718, pp. 198–206. doi: 10.1016/j.msea.2018.01.091.
  7. Shahmir H., Langdon T.G. Using heat treatments, high-pressure torsion and post-deformation annealing to optimize the properties of Ti-6Al-4V alloys. Acta Materialia, 2017, vol. 141, pp. 419–426. doi: 10.1016/j.actamat.2017.09.018.
  8. Sergueeva A.V., Stolyarov V.V., Valiev R.Z., Mukherjee A.K. Superplastic behaviour of ultrafine-grained Ti–6A1–4V alloys. Materials Science and Engineering: A, 2002, vol. 323, no. 1-2, pp. 318–325. doi: 10.1016/S0921-5093(01)01384-3.
  9. Pan Wang, Xipeng Tan, Mui Ling Sharon Nai, Shu Beng Tor, Jun Wei. Spatial and geometrical-based characterization of microstructure and microhardness for an electron beam melted Ti-6Al-4V component. Materials & Design, 2016, vol. 95, pp. 287–295. doi: 10.1016/j.matdes.2016.01.093.
  10. Shunyu Liu, Yung C. Shin. Additive manufacturing of Ti6Al4V alloy: a review. Materials & Design, 2019, vol. 164, article number 107552. doi: 10.1016/j.matdes.2018.107552.
  11. Džugan J., Novy Z. Powder Application in Additive Manufacturing of Metallic Parts. Powder Metallurgy – Fundamentals and Case Studies, 2017, article number 8. doi: 10.5772/66874.
  12. Panin A., Kazachenok M., Perevalova O., Martynov S., Panina A., Sklyarova E. Continuous electron beam post-treatment of EBF3-fabricated Ti–6Al–4V parts. Metals, 2019, vol. 9, no. 6, article number 699. doi: 10.3390/met9060699.
  13. Panin A.V., Kazachenok M.S., Dmitriev A.I., Nikonov A.Y., Perevalova O.B., Kazantseva L.A., Sinyakova E.A., Martynov S.A. The effect of ultrasonic impact treatment on deformation and fracture of electron beam additive manufactured Ti-6Al-4V under uniaxial tension. Materials Science and Engineering: A, 2022, vol. 832, article number 142458. doi: 10.1016/j.msea.2021.142458.
  14. Fuchs J., Schneider C., Enzinger N. Wire-based additive manufacturing using an electron beam as heat source. Welding in the World, 2018, vol. 62, pp. 267–275. doi: 10.1007/s40194-017-0537-7.
  15. Hayes B.J., Martin B.W., Welk B. et al. Predicting tensile properties of Ti-6Al-4V produced via directed energy deposition. Acta Materialia, 2017, vol. 133, pp. 120–133. doi: 10.1016/j.actamat.2017.05.025.
  16. Panin A.V., Kazachenok M.S., Panin S.V., Berto F. Scale Levels of Quasi-Static and Dynamic Fracture Behavior of Ti-6Al-4V Parts Built by Various Additive Manufacturing Methods. Theoretical and Applied Fracture Mechanics, 2020, vol. 110, article number 102781. doi: 10.1016/j.tafmec.2020.102781.
  17. Trojanová Z., Halmešová K., Drozd Z., Džugan J., Valiev R.Z., Podaný P. The influence of severe plastic deformation on the thermal expansion of additively manufactured Ti6Al4V alloy. Journal of Materials Research and Technology, 2022, vol. 19, pp. 3498–3506. doi: 10.1016/j.jmrt.2022.06.097.
  18. Mironov S., Sato Y.S., Kokawa H. Friction-stir welding and processing of Ti-6Al-4V titanium alloy: A review. Journal of Materials Science & Technology, 2018, vol. 34, no. 1, pp. 58–72. doi: 10.1016/j.jmst.2017.10.018.
  19. Vlasov I.V., Egorushkin V.E., Panin V.E., Panin A.V., Perevalova O.B. Fractography, Fracture Toughness and Structural Turbulence Under Low-Temperature Shock Loading of a Nonequilibrium Titanium Alloy Ti–6Al–4V. Mechanics of Solids, 2020, vol. 55, no. 5, pp. 633–642. doi: 10.3103/S0025654420050155.
  20. Syed A.K., Zhang Xiang, Caballero A., Shamir M., Williams S. Influence of deposition strategies on tensile and fatigue properties in a wire + arc additive manufactured Ti-6Al-4V. International Journal of Fatigue, 2021, vol. 149, article number 106268. doi: 10.1016/j.ijfatigue.2021.106268.
  21. Semenova I.P., Shchitsyn Y.D., Trushnikov D.N., Gareev A.I., Polyakov A.V., Pesin M.V. Microstructural Features and Microhardness of the Ti-6Al-4V Alloy Synthesized by Additive Plasma Wire Deposition Welding. Materials, 2023, vol. 16, no. 3, article number 941. doi: 10.3390/ma16030941.
  22. Valiev R.Z., Usmanov E.I., Rezyapova L.R. The Superstrength of Nanostructured Metallic Materials: Their Physical Nature and Hardening Mechanisms. Physics of Metals and Metallography, 2022, vol. 123, pp. 1272–1278. doi: 10.1134/S0031918X22601627.
  23. Morris D.G. Strengthening mechanisms in nanocrystalline metals. Nanostructured Metals and Alloys, 2011, pp. 299–328. doi: 10.1533/9780857091123.3.299.

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Copyright (c) 2024 Usmanov E.I., Savina Y.N., Valiev R.R.

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