Hot working of commercial Ti–6Al–4V with an equiaxed α–β microstructure: materials modeling considerations

Seshacharyulu, T.; Medeiros, S.C.; Frazier, William G.; Prasad, Y. V. R. K.

doi:10.1016/s0921-5093(00)00741-3

Cited by 414 publications

(179 citation statements)

References 18 publications

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“…The results show a good agreement with research work of others under certain conditions, i.e. when the titanium or titanium alloys were deformed at low temperature (here, less than 850°C for TA15) and low strain rate (less than 0.1 s À1 ) [8,[26][27][28]. It can be seen that the values of calculated n are temperature-dependent (decreased from 7.28 to 3.86) in the temperature range 750-850°C.…”

supporting

confidence: 89%

“…Commonly, the temperature and strain rate dependence of flow stress in hot deformation can be described by Arrhenius kinetic rate equation given by [25,26]:…”

Section: Kinetic Analysismentioning

confidence: 99%

“…[37], 3.4 for Ti-6Al-4V with an equiaxed a + b microstructure in the limited strain rate range 0.0003-0.01 s À1 and temperature range 750-950°C [26]. Here, the most possible reason accounting for relatively high stress exponent is that the softening behavior (e.g.…”

mentioning

confidence: 99%

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An experimental study of deformation mechanism and microstructure evolution during hot deformation of Ti–6Al–2Zr–1Mo–1V alloy

Zhu

Lai

et al. 2013

Materials & Design (1980-2015)

102

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a b s t r a c tIsothermal tensile tests have been performed to study the deformation mechanisms and microstructure evolution of Ti-6Al-2Zr-1Mo-1V titanium alloy in the temperature range 750-850°C and strain rate range 0.001-0.1 s À1. The deformation activations have been calculated based on kinetics rate equation to investigate the hot deformation mechanism. Microstructures of deformed samples have been analyzed by electron backscatter diffraction (EBSD) to evaluate the influences of hot deformation parameters on the microstructure evolution and recrystallization mechanism. The results indicate that deformation mechanisms vary with deformation conditions: at medium (800°C) and high (850°C) temperature, the deformation is mainly controlled by the mechanisms of dislocation creep and self-diffusion, respectively. The microstructure globularization mechanisms also depend on deformation temperature: in the temperature range from 750 to 800°C, the high angle grain boundaries are mainly formed via dislocation accumulation or subgrain boundaries sliding and subgrains rotation; while at high temperature of 850°C, recrystallization is the dominant mechanism. Especially, the evolution of the recrystallization mechanism with the deformation temperature is first observed and investigated in TA15 titanium alloy.

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supporting

confidence: 89%

“…Commonly, the temperature and strain rate dependence of flow stress in hot deformation can be described by Arrhenius kinetic rate equation given by [25,26]:…”

Section: Kinetic Analysismentioning

confidence: 99%

See 1 more Smart Citation

An experimental study of deformation mechanism and microstructure evolution during hot deformation of Ti–6Al–2Zr–1Mo–1V alloy

Zhu

Lai

et al. 2013

Materials & Design (1980-2015)

102

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show abstract

“…The material and process was chosen similar to [1,2], however, to make the study clearer, it was limited with deviation from the SP range only in terms of strain rate; temperature and microstructure were set to be optimal (900°C - Fig.2b, and 8µm fine grained microstructure) . To extend the range of the validity of the analysis, the data set was extended to include that cited by Seshacharyulu et al [8,9,10]; Fig. 1.…”

Section: Numerical Simulationsmentioning

confidence: 99%

The Mechanics of Superplastic Forming - How to Incorporate and Model Superplastic and Superplastic-Like Conditions

Bylya

Васин

Blackwell

2016

MSF

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Abstract. Much work has been carried out in understanding the mechanics of superplasticity (SP). Some of the present challenges in SP forming revolve around the use of lower forming temperatures and faster strain rates, which may involve pushing the process boundaries to incorporate "superplastic-like" forming -perhaps also in materials with non-optimized microstructures. For process optimization there is a requirement to be able to model both within the SP and superplastic-like processing window in an integrated way. From a mechanics point of view the presence of high rate sensitivity is often seen as the key factor in controlling SP response. However, changes in phase distribution and grain morphology, or the accumulation of damage (cavitation) may compromise this assumption. The paper will examine the range of validity of some SP constitutive models and how they may be adapted to take into account processing routes that may incorporate superplastic-like and more conventional SP deformation modes.

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“…Recent studies on equiaxed [7] and lamellar [8] b phase field Ti-6Al-4V microstructures reveal that dynamic recrystallization (DRX) occurs during hot deformation at strain rate range of 10 -3 -10 -1 s -1 . DRX is now recognized as one of the softening mechanisms in hot deformation of crystalline materials [9].…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior of Ti–6Al–4V Alloy in β Phase Field and Low Strain Rate

Honarmandi

Aghaie-Khafri

2012

Metallogr. Microstruct. Anal.

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Hot deformation of Ti-6Al-4V alloy in b phase field is studied by means of compression testing at different temperatures and strains. Microstructural observations indicate that dynamic recrystallization of b grains occurs in the designated experimental conditions. Dynamic recrystallization was analyzed on the basis of the JMAK kinetics equation and strain hardening rate versus stress curves. The apparent activation energy for hot deformation was calculated as 168.5 kJ/mol. The variation of dynamically recrystallized grain size with deformation temperature and strain was studied and an empirical equation was derived.

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Hot working of commercial Ti–6Al–4V with an equiaxed α–β microstructure: materials modeling considerations

Cited by 414 publications

References 18 publications

An experimental study of deformation mechanism and microstructure evolution during hot deformation of Ti–6Al–2Zr–1Mo–1V alloy

An experimental study of deformation mechanism and microstructure evolution during hot deformation of Ti–6Al–2Zr–1Mo–1V alloy

The Mechanics of Superplastic Forming - How to Incorporate and Model Superplastic and Superplastic-Like Conditions

Hot Deformation Behavior of Ti–6Al–4V Alloy in β Phase Field and Low Strain Rate

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