High-temperature deformation behavior of Ti60 titanium alloy

Jia, Weiju; Zeng, Weidong; Zhou, Yigang; Liu, Jianrong; Wang, Qingjiang

doi:10.1016/j.msea.2011.01.113

Cited by 131 publications

(57 citation statements)

References 30 publications

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“…The magnitude of the yield drop changed slightly as the strain rate increased from 0.01 s −1 to 0.1 s −1 , and pronouncedly reduced to the minimum when the strain rate increased from 0.1 s −1 to 1 s −1 for all the tests at higher temperatures (>900 • C). A similar evolution tendency was found in the hot compression of Ti60 alloy at the strain rate of 1 s −1 [10]. The possible reason was that high strain rate induced intense work hardening, which may conceal the discontinuous yielding behavior.…”

Section: Kinetic Analysissupporting

confidence: 71%

“…For instance, Li et al and Wang et al [14,15] discovered the discontinuous flow stress drop in α+β alloy Ti-3 Al-5 V-5 Mo and TC8, respectively. In addition, Jia et al [10] demonstrated the behavior in near α alloy of Ti60. Generally, the discontinuous yield phenomenon could be explained mainly by two theories: static theory and dynamic theory.…”

Section: Discontinuous Yielding Behaviormentioning

confidence: 99%

“…Besides, the flow stress decreased with increasing deformation temperature and decreasing strain rate, indicating the flow stress was sensitive to deformation temperature and strain rate. When deformed at higher temperature and lower strain rate (≥900 • C and ≤0.01 s −1 ), the flow stress-strain curves reached to steady values with the increase of true strain, indicating the softening mechanism, including dynamic recrystallization (DRX) of α phase or dynamic recovery (DRV) of β phase, proceeded quickly to balance the rate of work hardening [9,10]. Besides this, the other secondary phase particles rich in Sn, Mo, Ta and Nb elements at the grain boundaries may have pinning effect on dislocation motion (see Figure 7a), which partly balanced dynamic softening during hot compression of Ti-55 alloy.…”

Section: Introductionmentioning

confidence: 99%

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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: Kinetic Analysissupporting

confidence: 71%

Section: Discontinuous Yielding Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Wang

Jin

et al. 2017

Metals

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“…In general, flow stress was observed to decrease with the increase of compression temperature and to increase with increasing strain rate. Such continuous decrease in the flow stress with increasing strain has been previously reported for many titanium alloys [8][9][10].…”

Section: Resultssupporting

confidence: 79%

Hot Compressive Behavior and Constitutive Equation of TC4-DT Alloy

Zhu¹,

Wang²,

Li³

et al. 2017

dtetr

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The effect of processing parameters on the hot deformation behavior of the α+β titanium alloy TC4-DT has been investigated by hot compressive testing on the Gleeble-1500 thermal simulation test machine in the temperature range of 908℃~1038℃, and at constant strain rate from 0.01s -1 to 10s -1 . The results indicate that the hot deformation behavior of TC4-DT alloy is highly sensitive to the deformation temperature and strain rate. The flow behavior of the sample hot-deformaed exhibits a peak stress followed by continuous flow softening in the α+β region, whereas in the β region, the true stress attains a steady state. The peak flow stress decreases with increasing the deformation temperature and decreasing the strain rate. According to the arrhenius eqations, the constitutive equation of TC4-DT alloy is established, and the deformation activation energy are estimated to be about 694.508 KJ/mol in the α+β region and 252.496 KJ/mol in the β region, respectively.

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“…Some investigators [7,8] pointed out that dynamic recovery (DRV) dominated if the apparent activation energy for deformation was close to the activation energy for selfdiffusion. Hua et al [9] pointed out that dynamic recrystallization (DRX) was more noticeable at a temperature of 1173 K. Some investigators [10,11] also found that the restoration mechanism of α and β phase depended on the temperature.…”

Section: Introductionmentioning

confidence: 99%

Phase dependent restoration mechanisms of TC8 titanium alloy during hot compression in the two phase region

Wang

Luan

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The TC8 titanium alloy was isothermally compressed at 1133 K and 1213 K in the (α+β) two phase region. The microstructural evolution and restoration mechanism in the α and β phases were characterized by optical microscopy and transmission electron microscopy. The results show a significant effect of phase content on the microstructural evolution and restoration mechanism. The grain refinement occurs in the α phase at both temperatures, but in the β phase only at the higher temperature of 1213 K. This difference in microstructural evolution is attributed to the different temperature dependence of restoration mechanisms in the two phases. A significant increase in the volume fraction of β phase makes the restoration mechanism in the β phase change from dynamic recovery (DRV) to dynamic recrystallization (DRX), which subsequently induces the β grain refinement.

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High-temperature deformation behavior of Ti60 titanium alloy

Cited by 131 publications

References 30 publications

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

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

Hot Compressive Behavior and Constitutive Equation of TC4-DT Alloy

Phase dependent restoration mechanisms of TC8 titanium alloy during hot compression in the two phase region

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