Hot deformation mechanisms in ELI Grade Ti-6a1-4V

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

doi:10.1016/s1359-6462(99)00163-3

Cited by 133 publications

(42 citation statements)

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“…The results indicated that the main softening mechanism should be dynamic recrystallization in α + β dual-phase region and dynamic recovery in β single-phase region, respectively [20,21]. It should be noted that the activation energy in β phase region was mostly reported in the range of 180-220 kJ/mol during hot deformation of some titanium alloys [10,[21][22][23], while the activation energy in β region of the Ti-55 alloy reached 279.88 kJ, which was higher than other titanium alloys. The possible reason is that the initial material used in this study was an as-rolled sheet, which possessed finer microstructure and intense deformation texture, so it was more difficult to deform plastically during hot compression.…”

Section: mentioning

confidence: 93%

Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy

Wang

Jin

et al. 2017

Metals

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Abstract:The isothermal compression experiment of as-rolled Ti-55 alloy was carried out on a Gleeble-3800 thermal simulation test machine at the deformation temperature range of 700-1050 • C and strain rate range of 0.001-1 s −1 . The hot deformation behavior and the microstructure evolution were analyzed during thermal compression. The results show that the apparent activation energy Q in α + β dual-phase region and β single-phase region were calculated to be 453.00 KJ/mol and 279.88 KJ/mol, respectively. The deformation softening mechanism was mainly controlled by dynamic recrystallization of α phase and dynamic recovery of β phase. Discontinuous yielding behavior mainly occurred in β phase region, which weakened gradually with the increase of deformation temperature (>990 • C) and strain rate (0.01-1 s −1 ) in β phase region. The processing map derived from Murty's criterion was more accurate in predicting the hot workability than that derived from Prasad's criterion. The optimized hot working window was 850-975 • C/0.001-1 s −1 , in which sufficient dynamic recrystallization occurred and α + β-transus microstructure was obtained. When deformed at higher temperature (≥1000 • C), coarsened lath-shape β-transus microstructure was formed, while deformed at lower temperature (≤825 • C) and higher strain rate (≥0.1 s −1 ), the dynamic recrystallization was not sufficient, thus flow instability appeared because of shear cracking.

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Section: mentioning

confidence: 93%

Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy

Wang

Jin

et al. 2017

Metals

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show abstract

“…21). The change in average diameter of primary  grains -d p and average thickness of  lamellaeg p , induced by deformation, can be described for Ti-6Al-4V alloy by following equations, depending on morphology of primary  and  phases: (Seshacharyulu et al, 1999) where: Z -Zener-Holomon parameter. Fig.…”

Section: The Influence Of Deformation Conditions and Morphology Of Phmentioning

confidence: 99%

“…21. The effect of strain rate on average diameter of primary  phase grains in Ti 6Al-4V alloy with globular initial microstructure (Seshacharyulu et al, 1999) However presented model of dynamic recrystallization (Fig. 20) does not take into account the change of shape of primary  grains and deformation of recrystallized  grains.…”

Section: The Influence Of Deformation Conditions and Morphology Of Phmentioning

confidence: 99%

“…In the late 1990s the map of microstructure changes depending on deformation conditions was developed for Ti-6Al-4V alloy (Fig. 25) (Seshacharyulu et al, 1999). Fig.…”

Section: The Influence Of Deformation Conditions and Morphology Of Phmentioning

confidence: 99%

“…25. The map of microstructure changes and phenomena occurring during hot deformation of Ti-6Al-4V alloy (Seshacharyulu et al, 1999) Technological hot plasticity of + titanium alloys, characterized by plastic flow stress and critical strain, depends on morphology and stereological parameters of the phases in the alloy microstructure and deformation conditions (Kubiak, 2004).…”

Section: The Influence Of Deformation Conditions and Morphology Of Phmentioning

confidence: 99%

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