Experimental Analysis and Behaviour Modelling of the Deformation Mechanisms of a Ti-6242S Alloy under Hot and Superplastic Forming Conditions
| Autor: | Hiroaki Matsumoto, Vanessa Vidal, Laurie Despax, Hatsumi Onishi, Anzu, Longqiu Song, Vincent Velay |
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| Přispěvatelé: | Institut Clément Ader (ICA), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Kagawa University [Japan], Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
Materials science Superplasticity 02 engineering and technology softening mechanisms 01 natural sciences [SPI]Engineering Sciences [physics] 0103 physical sciences General Materials Science Composite material lcsh:Mining engineering. Metallurgy Tensile testing 010302 applied physics unified viscoplastic constitutive equations Metals and Alloys hot forming conditions Strain hardening exponent Strain rate 021001 nanoscience & nanotechnology TheoryofComputation_MATHEMATICALLOGICANDFORMALLANGUAGES Deformation mechanism Ti-6Al-2Sn-4Zr-2Mo titanium alloy Hardening (metallurgy) Dynamic recrystallization microstructural observations Astrophysics::Earth and Planetary Astrophysics Deformation (engineering) 0210 nano-technology |
| Zdroj: | Metals Metals, 2020, 10 (12), pp.1-17/1599. ⟨10.3390/met10121599⟩ Volume 10 Issue 12 Metals, MDPI, 2020, 10 (12), pp.1-17/1599. ⟨10.3390/met10121599⟩ Metals, Vol 10, Iss 1599, p 1599 (2020) |
| ISSN: | 2075-4701 |
| Popis: | In this work, the hot deformation characteristics of a near-&alpha Ti-Al-2SnZr-2Mo alloy (Ti6242 alloy) with a Fine-Grained (FG) microstructure (d&alpha = 2.86 &mu m) were investigated at two levels of temperature, T = 730 ∘C and T = 840 ∘C. The initial microstructure consists of equiaxed nodules of the &alpha phase as well as some &alpha lamellae sparsely distributed and separated by thin layers of the BCC &beta phase. For both temperatures, three strain rates (10&minus 4,10&minus 3,10&minus 2s1) were analysed during loading. Moreover, the microstructural evolution (&alpha size and morphology) was also evaluated by conducting interrupted tensile tests. The different tensile testing conditions greatly influence the stress-strain response of the material as well as the microstructure evolution. Indeed, various phenomena can take place such as elongation of the grain structure, globularization, dynamic recrystallization and grain growth of the equiaxed areas depending on the temperature, the strain rate and the strain level. The FG Ti6242 alloy exhibits interesting superplastic ductility at T = 840 ∘C. At this temperature either a very gradual flow softening (at higher strain rate) or flow hardening (at lower strain rate) can be observed and are related respectively to one or more of the following mechanisms: lamellae globularization, DRX and grain growth. At the intermediate strain rate, both mechanisms, strain hardening and softening, coexist. At T = 730 ∘C, the onset of the &alpha lamellae globularization was only promoted at low strain rate. A mechanical behavior model was developed in the temperature range of 730&ndash 840 ∘C, which was able to take into account all the observed phenomena: viscosity, softened behavior and strain hardening. Constitutive equations were calibrated from the stress-strain responses and microstructural observations, and the computed results were in good agreement with the experiments. |
| Databáze: | OpenAIRE |
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