–
Characterization of the superplastic behavior of a Ti6Al4V-ELI alloy bilayer sheet
GUGLIELMI Pasquale, PICCININNI Antonio, CUSANNO Angela, VAIANI Lorenzo, UVA Antonio Emmanuele, PALUMBO Gianfranco
download PDFAbstract. The aim of the present work is to investigate the superplastic behaviour of a bilayer Ti6Al4V-ELI to numerically design a full custom prosthesis manufacturing process by means of SuperPlastic Forming (SPF); the bilayer was composed by: (i) a monolithic Titanium blank (cut by a rolled sheet); (b) a porous blank cut by a billet produced by Hot Isostatic Pressing (HIP) and subjected to a Solid State Foaming (SSF) heat treatment. Experimental bulge tests aimed to evaluate the effects of both the initial porosity level of the HIPed layer and the temperature (850 and 900 °C) of the SPF process. The bilayer sample was deformed by a constant argon gas pressure and the time evolution of the dome height was recorded during the test in order to be used as target in the IA to determine the constants of the rheological model of the porous layer, being the behavior of the monolithic layer already known. A 2D FE model of the free inflation test was integrated in an automatic optimization procedure with the aim to minimize the error between the calculated and the acquired dome height vs time curve. Finally, the obtained material constants determined were used to design the SPF process by means of the numerical simulation, identifying as a case study a zygomatic full custom prosthesis. The initial porosity level resulted to poorly affect the superplastic behavior of the bilayer at 850 °C; on the contrary, when increasing the temperature up to 900 °C, an evident reduction of the forming time was obtained. Numerical simulations showed that at 900 °C it is possible to obtain the very complex geometry of the adopted case study in about 50000 seconds.
Keywords
Ti Alloy, Material Characterization, Superplasticity, Finite Element, Inverse Analysis
Published online 4/24/2024, 10 pages
Copyright © 2024 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: GUGLIELMI Pasquale, PICCININNI Antonio, CUSANNO Angela, VAIANI Lorenzo, UVA Antonio Emmanuele, PALUMBO Gianfranco, Characterization of the superplastic behavior of a Ti6Al4V-ELI alloy bilayer sheet, Materials Research Proceedings, Vol. 41, pp 1038-1047, 2024
DOI: https://doi.org/10.21741/9781644903131-114
The article was published as article 114 of the book Material Forming
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
References
[1] M.W. Kearns, Formation of Porous Bodies, 1987.
[2] S. Oppenheimer, D.C. Dunand, Solid-state foaming of Ti-6A1-4V by creep or superplastic expansion of argon-filled pores, Acta Mater 58 (2010) 4387–4397. https://doi.org/10.1016/j.actamat.2010.04.034.
[3] P. Guglielmi, A. Piccininni, A. Cusanno, A.A. Kaya, G. Palumbo, Mechanical and microstructural evaluation of solid-state foamed Ti6Al4V-ELI alloy, Procedia CIRP 110 (2022) 105–110. https://doi.org/10.1016/j.procir.2022.06.021.
[4] P. Guglielmi, A. Cusanno, I. Bagudanch, G. Centeno, I. Ferrer, M.L. Garcia-romeu, Experimental and numerical analysis of innovative processes for producing a resorbable cheekbone prosthesis, J Manuf Process 70 (2021) 1–14. https://doi.org/10.1016/j.jmapro.2021.07.060.
[5] D. Sorgente, L. Tricarico, The role of the numerical simulation in superplastic forming process analysis and optimization, Key Eng Mater 433 (2010) 225–234. https://doi.org/10.4028/www.scientific.net/KEM.433.225.
[6] F.U. Enikeev, A.A. Kruglov, An analysis of the superplastic forming of a thin circular diaphragm, Int J Mech Sci 37 (1995) 473–483. https://doi.org/10.1016/0020-7403(94)00081-T.
[7] D. Sorgente, G. Palumbo, A. Piccininni, P. Guglielmi, L. Tricarico, Modelling the superplastic behaviour of the Ti6Al4V-ELI by means of a numerical/experimental approach, International Journal of Advanced Manufacturing Technology 90 (2017) 1–10. https://doi.org/10.1007/s00170-016-9235-7.
[8] P. Guglielmi, A. Piccininni, A. Cusanno, G. Paumbo, Manufacturing of a hybrid component in Ti6Al4V-ELI alloy by combining diffusion bonding and superplastic forming, in: Materials Research Proceedings, Association of American Publishers, 2023: pp. 37–44. https://doi.org/10.21741/9781644902714-5.
[9] D. Sorgente, G. Palumbo, A. Piccininni, P. Guglielmi, S. Aksenov, Investigation on the thickness distribution of highly customized titanium biomedical implants manufactured by superplastic forming, CIRP J Manuf Sci Technol Accepted, (2017).
[10] A. Piccininni, D. Sorgente, G. Palumbo, Genetic Algorithm based inverse analysis for the superplastic characterization of a Ti-6Al-4V biomedical grade, Finite Elements in Analysis and Design 148 (2018) 27–37.
