Dissolution of the Alpha Phase in Ti-6Al-4V During Isothermal and Continuous Heat Treatment

Semiatin, S. L.; Obstalecki, Mark; Payton, E.J.; Pilchak, Adam L.; Shade, Paul A.; Levkulich, N. C.; Shank, Joshua; Pagan, Darren C.; Zhang, F.; Tiley, J.

doi:10.1007/s11661-019-05164-6

Cited by 18 publications

(12 citation statements)

References 31 publications

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“…The present dissolution experiments and analysis differed from those performed previously [29] in which attention had been focused on situations involving a pre-soak at a near-transus temperature (at which the equilibrium fraction of a was only~0.25) followed by either continuous heating through the transus or an isothermal supertransus exposure. In most of the former cases, the particles were sufficiently far apart to obviate the need to consider soft impingement (overlapping) of the concentration fields between adjacent particles.…”

Section: Approachmentioning

confidence: 86%

“…These materials also enabled the determination of the influence of solutes with markedly-different diffusivities in b titanium (i.e., vanadium vs molybdenum) on such behaviors. The Ti64 was from the same lot as that used previously [29] ; it was received in the form of 12.7-mm-diameter hot-rolled bar stock with a measured composition (in weight percent) of 6.33 Al, 4.07 V, 0.19 Fe, 0.16 O, 0.01 C, 0.01 N, 0.0048 H, balance titanium; its T b was 1261 K (988°C). The Ti6242S program alloy was also received as hot-rolled bar (with a diameter of 15.9 mm).…”

Section: A Materialsmentioning

confidence: 99%

“…This equipment was operated at an accelerating voltage of 15 kV, beam current of 15 nA, and aperture size of 150 lm. Based on previous experience, [29] the reliability of the measurements for the substitutional alloying elements was estimated to be~0.2 to 0.3 wt pct.…”

Section: B Experimental Proceduresmentioning

confidence: 99%

“…The present work complements a recent effort whose objective was to describe the supertransus static-dissolution kinetics of a under both isothermal and continuous-heating conditions using Ti64 as the program material. [29] II. MATERIALS AND EXPERIMENTAL PROCEDURES…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Transient Plastic Flow and Phase Dissolution During Hot Compression of α/β Titanium Alloys

Semiatin

Levkulich

Heck

et al. 2020

Metall Mater Trans A

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Section: Approachmentioning

confidence: 86%

Section: A Materialsmentioning

confidence: 99%

Section: B Experimental Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Transient Plastic Flow and Phase Dissolution During Hot Compression of α/β Titanium Alloys

Semiatin

Levkulich

Heck

et al. 2020

Metall Mater Trans A

Self Cite

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“…Liss et al summarized some of the main representative results for different metallic materials during thermomechanical processing [23]. Some recent works in titanium alloys dealt with in situ thermo-mechanical deformation in the α + β field [24,25] and with phase transformation kinetics during heating in metastable titanium alloys [26,27] and Ti-6Al-4V [28].…”

Section: Introductionmentioning

confidence: 99%

In-Situ Synchrotron X-Ray Diffraction of Ti-6Al-4V During Thermomechanical Treatment in the Beta Field

Warchomicka

Canelo-Yubero

Zehetner

et al. 2019

Metals

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This work aims to identify the mechanisms of restoration occurring in Ti-6Al-4V during hot plastic deformation and subsequent heat treatment. The allotropic phase transformation that occurs during cooling distorts the interpretation of the restoration mechanisms taking place at high temperatures. Therefore, analysis of deformed samples by conventional microscopy have led to controversies in the interpretation of the main dynamic restoration mechanism. Additionally, static restoration of the microstructure can occur during slow cooling, modifying the microstructure. These facts were mainly the reasons why discontinuous dynamic recrystallization and/or dynamic recovery has been reported as the main dynamic restoration mechanism for Ti-6Al-4V. In this work, we use in-situ synchrotron X-ray diffraction combined with conventional microscopy to determine the dynamic and static mechanisms of restoration during and after deformation at different strain rates. The results show dynamic recovery as main mechanism of restoration during deformation in the β field, denoted by sub-grain formation and a misorientation dependency of the strain rate. After deformation, static recrystallization, grain growth, and coarsening of the β grains can be observed, especially at strain rates higher than 0.1s−1. It is also demonstrated that the nucleation of new grains can occur within the very first seconds of the isothermal heat treatment.

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Phase transformation of the Ti-5553 titanium alloy subjected to rapid heating

Chanfreau

Poquillon

Stark³

et al. 2022

J Mater Sci

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The a ? b phase transformation upon heating in the Ti-5553 alloy with lamellar-nodular bimodal microstructure was tracked in situ with high energy X-ray diffraction. Rapid heating at 10, 50 and 100 °C s -1 from room temperature to 1050 °C was tested. Phase transformation on heating was studied by a combined analysis of the microstructural features that provides estimates of mass fractions, mean lattice parameters and full width at half maximum for the two phases. In comparison with equilibrium conditions, the experimental mass fractions reveal a shift of the transformation domain toward high temperatures when the heating rate increases. Also, the dissolution of the a phase is largely impacted by its morphology, the transformation being faster for a lamellae. The combined analysis of mean lattice parameters and full width at half maximum suggests that the a ? b phase transformation on heating is diffusion controlled. The b phase therefore inherits the solute content of the adjacent parent a phase, leading to chemical heterogeneities in the b phase regardless of the heating rate.

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Dissolution of the Alpha Phase in Ti-6Al-4V During Isothermal and Continuous Heat Treatment

Cited by 18 publications

References 31 publications

Transient Plastic Flow and Phase Dissolution During Hot Compression of α/β Titanium Alloys

Transient Plastic Flow and Phase Dissolution During Hot Compression of α/β Titanium Alloys

In-Situ Synchrotron X-Ray Diffraction of Ti-6Al-4V During Thermomechanical Treatment in the Beta Field

Phase transformation of the Ti-5553 titanium alloy subjected to rapid heating

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