Investigation of the mechanical behaviour of Ti–6Al–4V alloy under hot forming conditions: Experiment and modelling

Velay, Vincent; Matsumoto, Hiroaki; Sasaki, Layla; Vidal, Vanessa

doi:10.1002/mawe.201400293

Cited by 4 publications

(6 citation statements)

References 8 publications

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“…Two different starting microstructures are considered, both of them consist of equiaxed α grains. They are produced using a combined forging-rolling process providing plates with a thickness between 1.4 mm and 3 mm and an Ultra Fine grain (UFG) microstructure with a mean α grain size of 0.5 µm [18] and a Fine Grain microstructure (FG) with a mean α grain size of 3 µm [23] respectively. Priorly, the first type of microstructure was solution treated at 1125…”

Section: Methodsmentioning

confidence: 99%

Behavior modeling and microstructural evolutions of Ti–6Al–4V alloy under hot forming conditions

Velay

Matsumoto

Vidal

et al. 2016

International Journal of Mechanical Sciences

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Ti-6Al-4V alloy is widely used in superplastic forming process. The conventional conditions require high forming temperatures (T ≥ 900 • C) and low strain rates (ε ≤ 10 −3 s −1). In order to reduce the costs of the industrial process, recent investigations focus on the micro-structural refinement of the material. It allows an improvement of the forming conditions which makes lower forming temperatures and higher strain rates eligible whereas low strain rates (ε ≤ 10 −3 s −1) and high temperatures (T ≥ 800 • C) are particularly suitable for conventional superplastic forming conditions. However, the mechanical response of the Titanium alloy strongly depends on the starting micro-structure considered and on its evolution with the temperature and the deformation. The objective of the present investigation is to observe the micro-structural evolutions of Ti-6Al-4V alloy under thermal and mechanical loadings from different starting micro-structures. Hence, an internal grain growth variable is identified by the use of these observations. Then, it is introduced into the behavior model and its influence on the mechanical response of the material is analysed. The final constitutive equations are able to take into account viscosity, strain hardening and grain size evolution for a wide range of strain rates and forming temperatures (10 −4 s −1 ≤ε ≤ 10 −2 s −1 ; 650 • C ≤ T ≤ 870 • C). Moreover, the model is able to consider several starting microstructures (different initial grain sizes) and to predict their influence on the viscous flow and the strain hardening. At last, some model verifications are conducted to check the validity of the non-isothermal model formulation. Some predictions are also performed by considering several starting microstructures.

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Section: Methodsmentioning

confidence: 99%

Behavior modeling and microstructural evolutions of Ti–6Al–4V alloy under hot forming conditions

Velay

Matsumoto

Vidal

et al. 2016

International Journal of Mechanical Sciences

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“…Most of the tensile tests were performed at the Kagawa University in air atmosphere (a specific coating was used on the surface to minimize some oxidation phenomenon). For FG1 samples (initial α grain size of 3 µm), the test at 730°C and 840°C were conducted at ICA-IMT Mines Albi [11] . Note that in this case Argon atmosphere was used.…”

Section: Tensile Testsmentioning

confidence: 99%

Experimental study of the superplastic and hot deformation mechanisms of a Ti-6Al-2Sn-4Zr-2Mo Titanium Alloy

et al. 2020

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To clarify the hot deformation characteristics of Ti alloys, flow behaviour, micro structural evolution and deformation mechanisms were investigated in a Ti-6Al-2Sn-4Zr-2Mo alloy with two initial micro structure: an ultra-fine grained (UFG) and a fine-grained (FG) microstructure (dα=0,8 µm and dα=3 µm respectively) by isothermal interrupted tensile tests, SEM observations and through electron back scatter diffraction experiments. Depending on the test conditions and on the initial α grain size, the flow behaviour can exhibit steady state flow and/or hardening and/or softening. The microstructure and texture evolutions have been studied mainly by using electron backscatter diffraction (EBSD) technique and SEM observations. They evidenced in particular the occurrence of α grains growth as well as dynamic recrystallization (DRX). The different flow behaviour associated to the microstructure evolution is shown and discussed to clarify the main deformation mode that could be assume to occur depending on the microstructure, the temperature and the strain rate.

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“…Last, the hardening parameters Q and b are also assessed by using the tensile test under small deformation conditions. The last stage of the identification process is performed at the scale of the sample [7]. This step requires the implementation of an inverse analysis combined to a FE simulation and an optimisation toolbox.…”

Section: S S S : S S S and S S S Is The Deviatoric Part Of The Cauchymentioning

confidence: 99%

“…Afterwards, a behaviour model using appropriate constitutive equations is presented [4,5,6], an identification strategy of the model parameters is discussed [7]. Finally, the behaviour model is implemented in a Finite Element Code in order to simulate the behaviour of a realistic industrial part under hot forming conditions.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanical behaviour of this typical micro-structure is studied by performing different mechanical tensile tests from a temperature range between 550 • C and 730 • C. The results are analysed by using the stress-strain curves and the induced micro-structural evolutions. Afterwards, a behaviour model using appropriate constitutive equations is presented [4,5,6], an identification strategy of the model parameters is discussed [7]. Finally, the behaviour model is implemented in a Finite Element Code in order to simulate the behaviour of a realistic industrial part under hot forming conditions.…”

Section: Introductionmentioning

confidence: 99%

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Hot Forming Process Analysis of Ti6Al-4V Alloy: Experiment, Behaviour Modelling and Finite Element Simulation

Velay

Matsumoto

Vidal

et al. 2016

MSF

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Abstract. The present investigation aims at evaluating and understanding the thermo-mechanical behaviour of a titanium alloy under hot forming conditions. In this work, several considerations are addressed. First, Scanning Electron Microscopy observations are performed to assess the evolutions of (α − β) phases, grain size, defects regarding the thermo-mechanical loadings from different static and dynamic tests (various temperatures and strain rates). Hence, the relationships between mechanical properties and micro-structure evolutions in such conditions allow a first assessment of the deformation mechanisms in link with the macroscopic stress-strain curves. Afterwards, a behaviour model formulation associated to an identification procedure of the parameters of the constitutive equations is proposed. Finally, several tests performed under hot forming conditions and conducted on an industrial press are compared to Finite Element calculations. Results are compared and provide some interesting improvement ways in order to investigate the influence of the process parameters on the final shape of the part.

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Investigation of the mechanical behaviour of Ti–6Al–4V alloy under hot forming conditions: Experiment and modelling

Cited by 4 publications

References 8 publications

Behavior modeling and microstructural evolutions of Ti–6Al–4V alloy under hot forming conditions

Behavior modeling and microstructural evolutions of Ti–6Al–4V alloy under hot forming conditions

Experimental study of the superplastic and hot deformation mechanisms of a Ti-6Al-2Sn-4Zr-2Mo Titanium Alloy

Hot Forming Process Analysis of Ti6Al-4V Alloy: Experiment, Behaviour Modelling and Finite Element Simulation

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