Effect of Test Temperature on Tensile Behavior of Ti-5Al-5V-2Mo-1Cr-1Fe (α+β) Titanium Alloy with Initial Microstructures in Hot Forged and Heat Treated Conditions

Kumar, V. Anil; Gupta, Rohit; Chakravadhanula, Venkata Sai Kiran; Rao, A. Gourav; Prasad, M.J.N.V.; Murty, S. V. S. Narayana

doi:10.1007/s11661-019-05207-y

Cited by 12 publications

(2 citation statements)

References 59 publications

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“…From the aforementioned flow stress-strain curves, it is evident that, as deformation continues beyond the peak stress value, progressive softening processes emerge, leading to a change in the flow behavior. The softening mechanisms of near-α Ti alloys can be attributed to a variety of factors including DRX, DRV, dynamic spheroidization, superplasticity, flow localization, deformation bands, and cracking [34][35][36][37]. The stress-strain data offer a depiction of the correlation between the stress value and thermal characteristics.…”

Section: Microstructure Evolutionmentioning

confidence: 99%

Constitutive Model and Microstructure Evolution of Ti65 Titanium Alloy

Sun,

Teng

et al. 2024

Materials

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The hot deformation behavior and mechanism of Ti65 alloy with a bimodal microstructure were investigated by isothermal compression experiments conducted on the Thermecmastor-Z simulator equipment at temperatures ranging from 950 to 1110 °C and strain rates ranging from 0.01 to 10.0 s−1. The Arrhenius constitutive model, based on strain compensation, and Grey Wolf optimization-neural network with back propagation model (GWO–BP), were both established. The differences between the experimental and predicted value of flow stress were compared and analyzed using the two models. The results show that the prediction accuracy of GWO–BP in the two-phase region is higher than that of Arrhenius model. In the single-phase region, both methods demonstrated high prediction accuracy. Compared to the single-phase region, the flow stress of Ti65 alloy shows a higher degree of softening in the two-phase region. During deformation in the two-phase region, the initial lamellar α phase transformed from a kinked and elongated morphology to a globularized topography as the strain rate decreased. Boundary-splitting was the primary mechanism leading to the spheroidization process. The degree of recrystallization increased with the increase in strain rate during the deformation in the single-phase region, while dynamic recovery and strain-induced grain boundary migration were the main deformation mechanisms at a lower strain rate. Discontinuous dynamic recrystallization may be the dominant recrystallization mechanism under a high strain rate of 10 s−1.

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Section: Microstructure Evolutionmentioning

confidence: 99%

Constitutive Model and Microstructure Evolution of Ti65 Titanium Alloy

Sun,

Teng

et al. 2024

Materials

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“…Wang et al studied the deformation features and static recrystallization behaviors of α and β phases in the hot rolling plus annealing process of a TC21 Ti alloy. Kumar et al discussed the tensile properties of a hot‐forged and heat‐treated α + β Ti alloy, and the influences of heat treatment parameters on microstructure change were also analyzed.…”

Section: Introductionmentioning

confidence: 99%

Precipitation of Secondary Phase and Phase Transformation Behavior of a Solution‐Treated Ti–6Al–4V Alloy during High‐Temperature Aging

et al. 2020

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The precipitation of secondary phase and phase transformation behavior of a solution-treated Ti-6Al-4V alloy during aging heat treatment are investigated. The content, size of the equiaxed α phase, and the thickness of secondary phase are greatly influenced by the aging temperature. With the increased aging temperature, the mean grain size of the equiaxed α phase significantly decreases, whereas the precipitation process of the secondary phase is accelerated. Furthermore, during aging heat treatment, the precipitation and growth of the secondary phase not only destroy the initial lamellar α phase, but also connect with the equiaxed α phase to form a new curved lamellar α phase. In addition, it is found that the α 0 phase is precipitated, and the α 0 !α þ β phase transition occurs with the increased aging temperature.

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