Constitutive analysis of hot deformation behavior of a Ti6Al4V alloy using physical based model

Souza, Paul M.; Beladi, Hossein; Singh, Rajeev Kumar; Rolfe, Bernard; Hodgson, Peter

doi:10.1016/j.msea.2015.09.055

Cited by 64 publications

(29 citation statements)

References 45 publications

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“…It is well known that the material flow softening under hot working can be induced by deformation heating and microstructural evolution [50]. under hot working, the heating caused by plastic deformation cannot be immediately dissipated.…”

Section: Discussion Of Flow Softening Mechanismsmentioning

confidence: 99%

Study of Flow Softening Mechanisms of a Nickel-Based Superalloy With Δ Phase

Lin

Chen

et al. 2016

Archives of Metallurgy and Materials

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The flow softening behaviors of a nickel-based superalloy with δ phase are investigated by hot compression tests over wide ranges of deformation temperature and strain rate. Electron backscattered diffraction (EBSD), optical microscopy (OM), and scanning electron microscopy (SEM) are employed to study the flow softening mechanisms of the studied superalloy. It is found that the flow softening behaviors of the studied superalloy are sensitive to deformation temperature and strain rate. At high strain rate and low deformation temperature, the obvious flow softening behaviors occur. With the increase of deformation temperature or decrease of strain rate, the flow softening degree becomes weaken. At high strain rate (1s−1), the flow softening is mostly induced by the plastic deformation heating and flow localization. However, at low strain rate domains (0.001-0.01s−1), the effects of deformation heating on flow softening are slight. Moreover, the flow softening at low strain rates is mainly induced by the discontinuous dynamic recrystallization and the dissolution of δ phase (Ni3Nb).

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Section: Discussion Of Flow Softening Mechanismsmentioning

confidence: 99%

Study of Flow Softening Mechanisms of a Nickel-Based Superalloy With Δ Phase

Lin

Chen

et al. 2016

Archives of Metallurgy and Materials

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“…And the slope is 1/n. The lnA can also be acquired from Equation (24). For a particular strain rate, differentiating Equation (24) yields: Figure 11 shows the relationship between ln[sinh(ασ)] and 1000/T.…”

Section: Strain Compensated Arrhenius-type Constitutive Modelmentioning

confidence: 99%

“…However, the hot deformation of the Ti-6Al-4V alloy is a difficult process in controlling microstructure and mechanical properties, due to its narrow processing window of temperature and time [24]. Therefore, it is very important to comprehensively consider the influences of various factors (such as friction, temperature increasing, strain, stain rate, and temperature, etc.)…”

Section: Introductionmentioning

confidence: 99%

Correction of Flow Curves and Constitutive Modelling of a Ti-6Al-4V Alloy

Dong

Zhang

et al. 2018

Metals

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Abstract:Isothermal uniaxial compressions of a Ti-6Al-4V alloy were carried out in the temperature range of 800-1050 • C and strain rate range of 0.001-1 s −1 . The effects of friction between the specimen and anvils as well as the increase in temperature caused by the high strain rate deformation were considered, and flow curves were corrected as a result. Constitutive models were discussed based on the corrected flow curves. The correlation coefficient and average absolute relative error for the strain compensated Arrhenius-type constitutive model are 0.986 and 9.168%, respectively, while the values for a modified Johnson-Cook constitutive model are 0.924 and 22.673%, respectively. Therefore, the strain compensated Arrhenius-type constitutive model has a better prediction capability than a modified Johnson-Cook constitutive model.

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“…[25] These equations have been used to predict the flow stress of Ti64 in the b field and Ti64 and Ti17 (and other alloys) in the a+b field. [24,25,38,63,64] More advanced ISV models have also been developed. [26,27,29,39,[65][66][67] In addition to mobile dislocation density, these approaches consider other factors such as cell/subgrain size (associated with geometrically-necessary dislocation content), grain size (i.e., high-angle-boundaries), and immobile dislocation content.…”

Section: Phenomenological Modelsmentioning

confidence: 99%

An Overview of the Thermomechanical Processing of α/β Titanium Alloys: Current Status and Future Research Opportunities

Semiatin

2020

Metall Mater Trans A

136

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Current understanding of the principles underlying the thermomechanical processing (TMP) of a/b titanium alloys is reviewed. Attention is focused on the formulation of constitutive descriptions for plastic flow under hot-working conditions, the evolution of microstructure, the occurrence of defects, and novel/emerging TMP techniques. With regard to constitutive behavior, descriptions of the plastic flow of the individual phases and two-phase alloys per se are summarized. The important influence of phase morphology, size, and volume fraction on plastic flow is emphasized. Mechanisms which underlie microstructure evolution include beta recrystallization (in the high-temperature b field), the development of dislocation substructure and its effect on dynamic and static spheroidization of colony microstructures (in the two-phase field), static and dynamic coarsening of primary a, and the development of deformation and transformation textures. In the area of defects, the effect of TMP variables and starting microstructure on the formation of cavities, the persistence of microtexture, and the development of undesirably-coarse b grain structures are described. The current status of relatively new processing techniques for a/b titanium alloys such as low-temperature superplastic forming and solid-state joining (via linear friction or friction-stir methods) are also briefly reviewed. Last, R&D which could help to resolve deficiencies in the current knowledge base for TMP of a/b titanium alloys are summarized for each of the areas.

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Constitutive analysis of hot deformation behavior of a Ti6Al4V alloy using physical based model

Cited by 64 publications

References 45 publications

Study of Flow Softening Mechanisms of a Nickel-Based Superalloy With Δ Phase

Study of Flow Softening Mechanisms of a Nickel-Based Superalloy With Δ Phase

Correction of Flow Curves and Constitutive Modelling of a Ti-6Al-4V Alloy

An Overview of the Thermomechanical Processing of α/β Titanium Alloys: Current Status and Future Research Opportunities

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