Dynamic Softening Mechanisms and Microstructure Evolution of TB18 Titanium Alloy during Uniaxial Hot Deformation

Fu, Qiang; Yuan, Wei; Xiang, Wei

doi:10.3390/met11050789

Cited by 11 publications

(7 citation statements)

References 52 publications

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“…In Figure 1(b), when the temperature is higher than 925°C, the flow stress curve does not have distinct dynamic softening effects. After the peak stress, the curve quickly reaches a steady state, and then the curve oscillates slightly, which is a typical feature of DRV [28]. The stress–strain curve exhibits DRV characteristics at high temperatures (≥925°C) are shown in Figure 1.…”

Section: Resultsmentioning

confidence: 99%

“…The stress-strain curve exhibits DRV characteristics at high temperatures ( ≥ 925°C) are shown in Figure 1. At the same time, the discontinuous yielding phenomenon also appears when the strain rate is 1 s −1 , which may be related to the movement of dislocations in grain boundaries and the rapid diffusion of dislocations [29][30][31], Discontinuous yielding has been found in many titanium alloys, such as TB18 titanium alloy [28], Ti-5Al-5Mo-5V-3Cr alloy [32], Ti-6Al-4V alloy [33], Ti55 alloy [34] and TC8 alloy [35].…”

Section: Stress-strain Curvementioning

confidence: 99%

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The analysis of hot deformation behaviour of low-cost α+β Ti-6Al-0.4V-1.2Fe alloys

Wan

Ren

Guo

et al. 2023

Materials Science and Technology

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The low-cost Ti-6Al-0.4V-1.2Fe alloy was subjected to isothermal compression experiments on the Gleeble 3800, and the deformation temperature was 775°C∼975°C and the strain rate was 0.01 s−1∼10 s−1. Based on the experimental data on thermal deformation, the microstructure evolution was studied and the constitutive equation was developed. The experimental results show that the flow stress increased with increasing deformation temperature and with the increase of the strain rate; the optimal deformation temperature of Ti-6Al-0.4V-1.2Fe alloy is 820°C∼950°C, and the strain rate is 0.01 s−1∼0.32 s−1; During hot deformation, the primary softening mechanism of this alloy is continuous dynamic recrystallisation. Compared with Ti-6Al-4V, the Ti-6Al-0.4V-1.2Fe alloy has better hot workability and better plasticity. Highlights A newly low-cost Ti-6Al-0.4V-1.2Fe alloy was designed based on the Kβ stability coefficient method, and the β stability coefficient was the same as that of Ti-6Al-4V. A study on the microstructure evolution in the process of hot deformation between Ti-6Al-0.4V-1.2Fe and Ti-6Al-4V alloys. A study on microstructure evolution and hot working process of a newly low-cost Ti-6Al-0.4V-1.2Fe alloy.

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Section: Resultsmentioning

confidence: 99%

Section: Stress-strain Curvementioning

confidence: 99%

The analysis of hot deformation behaviour of low-cost α+β Ti-6Al-0.4V-1.2Fe alloys

Wan

Ren

Guo

et al. 2023

Materials Science and Technology

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“…The microstructure of as-received billet consisted by equiaxed ¡ phase inside the ¢ phase matrix and continuous and discontinuous ¡ phase along prior ¢ grain boundaries, which was shown in our previous work. 9) Hot compression tests were conducted using a Gleeble 3800 thermomechanical simulator. Cylindrical samples (¤10 © 15 mm) were cut from the middle of the billet along the longitudinal direction.…”

Section: Methodsmentioning

confidence: 99%

“…However, it is worth noting that the degree of recrystallization in ¢ titanium alloy was not high, 36) so the decrease of ©111ª texture intensity was not particularly obvious. Because of the large ¢ grains and lower volume fraction of recrystallization of TB18 alloy during hot deformation, 9) the deformation texture is preserved by dynamic recovery, on account of insufficient dynamic recrystallization to alter it. 3739) Figure 7 showed the ODF section of TB18 alloy corresponding to Fig.…”

Section: Macrotexture Evolution Of ¢ Phasementioning

confidence: 99%

“…Long et al 8) studies the hot deformation behavior of Ti6Cr5Mo5V4Al alloy, and suppose that the higher softening values in the ¡ + ¢ phase field is on account of the occurrences of DRX and DG, and the lower softening values in the ¢ phase field is ascribe to dynamic recovery (DRV). In our previous work, 9) we figure out the effect of temperature and strain rate on dynamic softening mechanisms and microstructure evolution in TB18 alloy, and the influence of strain on texture and microstructure evolution will be discussed in the present study.…”

Section: Introductionmentioning

confidence: 96%

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Microstructure Characteristic and Texture Evolution of TB18 Titanium Alloy during Hot Compression in the β Phase Zone

Feng

Xiang³

et al. 2022

Mater. Trans.

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In the present study, microstructure characteristic and texture evolution of TB18 titanium alloy were studied by isothermal hot compression under different strain with strain rate of 0.001 s ¹1 and 0.1 s ¹1 in the ¢ phase zone. Electron Back-Scattered Diffraction (EBSD) and XRD were used to characterize the microstructure and macrotexture. Microstructure characteristic demonstrated that coarse ¢ grains flatten and elongated to the compression direction as strain increased. The dynamic recrystallization mechanism is continuous dynamic recrystallization (CDRX) at lower strain rate, while discontinuous dynamic recrystallization (DDRX) at higher strain rate. The deformation is strongly dependent on the dislocation density, geometrically necessary dislocations density increased with strain at different strain rate. The limited faction of dynamic recrystallization has little effect on texture evolution, and the texture evolution is ascribed to the strain induced boundary migration and activity of slip system. At lower strain rate, the lower activity of {110}©111ª slip system and higher activity of {123}©111ª enhanced the ©110ª texture and weakened the ©111ª texture; at higher strain rate, the higher activity of {123}©111ª slip system modified the ©111ª ¢ texture intensity and enhances the ©110ª texture.

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Hot working behaviour of low-cost Ti-3.4Fe bio-implant alloy

Mosoma

Klenam

Maunganidze

et al. 2023

Int J Adv Manuf Technol

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This study investigated the hot workability of an experimental, non-toxic, low-cost Ti-3.4Fe alloy using flow stress analysis, constitutive modelling, processing maps and microstructural examination. Hot compression tests were performed on Ti-3.4Fe alloy samples at different deformation temperatures (750, 800, 850 and 900 °C), strain rates (0.05, 0.1, 1 and 10 s−1) and a total strain of 0.6. The compression tests were performed using a Gleeble® 3500 thermomechanical simulator. The isothermally compressed samples were analysed using a scanning electron microscope to assess the microstructure. An Arrhenius-based model was used to derive the constitutive constants. From the results, the stress exponent and activation energy were 4.91 and 611 kJ.mol−1 under the steady-state stress condition and 5.32 and 675 kJ.mol−1 at peak stress. The stress exponents suggested a dislocation climb and glide mechanism controlling deformation. The processing map showed that the optimum conditions to deform Ti-3.4Fe were 850 °C at a strain rate of 0.1 s−1 for both steady-state and peak stresses. The microstructure revealed kinked, rotated and bent lamella at the safe region (850 °C at 0.05 s−1), confirming the dominance of dynamic recovery as the softening mechanism. Instabilities manifested as cracks and inhomogeneity at 750 °C and 1 s−1 and at 850 °C and 10 s−1.

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Dynamic Softening Mechanisms and Microstructure Evolution of TB18 Titanium Alloy during Uniaxial Hot Deformation

Cited by 11 publications

References 52 publications

The analysis of hot deformation behaviour of low-cost α+β Ti-6Al-0.4V-1.2Fe alloys

The analysis of hot deformation behaviour of low-cost α+β Ti-6Al-0.4V-1.2Fe alloys

Microstructure Characteristic and Texture Evolution of TB18 Titanium Alloy during Hot Compression in the β Phase Zone

Hot working behaviour of low-cost Ti-3.4Fe bio-implant alloy

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