Constitutive Relationship for Hot Deformation of TB18 Titanium Alloy

Fu, Qiang; Yuan, Wei; Xiang, Wei

doi:10.1155/2020/5716548

Cited by 8 publications

(4 citation statements)

References 44 publications

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“…The flow-localization band formed under shear force due to adiabatic temperature rise and low thermal conductivity at lower temperature and higher strain rate [12]. According to our previous work [23], when the strain rate was higher than 1 s −1 , the adiabatic heating effect was remarkable, with an increase in strain rate and a decrease in temperature, which potentially affected the actual deformation temperature by almost 90 °C. An increase in temperature resulted in flow softening at high strain rates, while a faster strain rate led to insufficient time for the recovery process [11].…”

Section: Instability Regionmentioning

confidence: 86%

“…In order to eliminate the influence of friction between samples and anvils and the influence of adiabatic heating at high strain rates on flow stress, the measured true stressstrain curves were revised; the details can be seen in our previous work [23]. The corrected flow stress-strain curves under different conditions are shown in Figure 2.…”

Section: True Stress-strain Curvesmentioning

confidence: 99%

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

Yuan

Xiang³

2021

Metals

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In this study, isothermal compression tests of TB18 titanium alloy were conducted using a Gleeble 3800 thermomechanical simulator for temperatures ranging from 650 to 880 °C and strain rates ranging from 0.001 to 10 s−1, with a constant height reduction of 60%, to investigate the dynamic softening mechanisms and hot workability of TB18 alloy. The results showed that the flow stress significantly decreased with an increasing deformation temperature and decreasing strain rate, which was affected by the competition between work hardening and dynamic softening. The hyperbolic sine Arrhenius-type constitutive equation was established, and the deformation activation energy was calculated to be 303.91 kJ·mol−1 in the (α + β) phase zone and 212.813 kJ·mol−1 in the β phase zone. The processing map constructed at a true strain of 0.9 exhibited stability and instability regions under the tested deformation conditions. The microstructure characteristics demonstrated that in the stability region, the dominant restoration and flow-softening mechanisms were the dynamic recovery of β phase and dynamic globularization of α grains below transus temperature, as well as the dynamic recovery and continuous dynamic recrystallization of β grains above transus temperature. In the instability region, the dynamic softening mechanism was flow localization in the form of a shear band and a deformation band caused by adiabatic heating.

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Section: Instability Regionmentioning

confidence: 86%

Section: True Stress-strain Curvesmentioning

confidence: 99%

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

Yuan

Xiang³

2021

Metals

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“…Tensile testing was performed using an Instron 8801 machine, which was equipped with an extensometer to accurately measure the strain. Standard M10 cylindrical tension test specimens were prepared in accordance with the ASTM E8/E8M-16a standard [20]. The tensile tests were conducted at a constant strain rate of 0.5 mm/min.…”

Section: Preparation Of the Samplesmentioning

confidence: 99%

Effect of Aging Temperature on the Microstructure and Mechanical Properties of a Novel β Titanium Alloy

Xiang,

Yuan,

Deng

et al. 2023

Materials

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High-strength metastable β titanium alloys are promising structural materials to be used in aviation industries. In order to achieve a high strength level, solid solution treatment within β region and subsequent low-temperature aging are usually necessary to obtain fine α precipitates. The selection of the aging temperature is considered critical to the mechanical performance of metastable β titanium alloys. In this work, we investigated the effect of aging temperature on the microscopic structure and mechanical properties of a novel type of titanium alloy TB18 (Ti-4.5Al-5Mo-5V-6Cr-1Nb). A series of aging treatments were conducted on TB18 specimens at 510 °C, 520 °C, 530 °C, and 540 °C after the solid solution treatment at 870 °C. On the basis of the systematic results of scanning electron microscope and transmission electron microscope, the behavior of the α phases affected by the varied aging temperatures were studied. As the aging temperature rose, the grain width of the α phase increased from 60 nm (510 °C) to 140 nm (540 °C). For the TB18 samples aged at 510 °C and 540 °C, the tensile strength/yield strength/impact toughness values were 1365 ± 3 MPa/1260 ± 0.9 MPa/26.5 ± 1.2 J/cm2 and 1240 ± 0.9 MPa/1138 ± 0.8 MPa/36.2 ± 1.3 J/cm2, respectively. As a result, the tensile performance and the grain width of the α phase agreed well with the Hall–Petch relationship. This work offers valuable support for both theoretical analyses and the heat treatment strategies on the novel TB18 titanium alloy.

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“…A modified JC model was proposed by Niu et al [4], and an average absolute error of 1.46% was achieved. Fu et al [5] developed a flow stress model that eliminated the effects of friction and adiabatic heating. Also using the Arrhenius model, Liu et al [6] constructed a constitutive model that considered dynamic recrystallisation (DRX) softening during thermal compression.…”

Section: Introductionmentioning

confidence: 99%

Unified Modelling of Flow Stress and Microstructural Evolution of 300M Steel under Isothermal Tension

Chen

Zhang

Wang

et al. 2021

Metals

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Constitutive models that reflect the microstructure evolution is of great significance to accurately predict the forming process of forging. Through thermal tension of 300M steel under various temperatures (950~1150 °C) and strain rates (0.01~10 s−1), the material flow and microstructure evolutions were investigated. In order to describe both the exponential hardening phenomenon at a higher temperature, and the softening phenomenon due to recrystallization at a lower temperature, a constitutive model considering microstructure evolution was proposed based on the Kocks–Mecking model. It was found that considering the stress-strain curve to be exponential in the work-hardening stage could improve the constitutive model prediction precision. The average error was 2.43% (3.59 MPa), showing that the proposed model was more precise than the modified Arrhenius model and the Kocks–Mecking model. The models to describe recrystallization kinetics and average grain size were also constructed. This work enabled the Kocks–Mecking model to predict stress-strain curves with a higher accuracy, and broadened the applicable range of the Kocks–Mecking model.

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Constitutive Relationship for Hot Deformation of TB18 Titanium Alloy

Cited by 8 publications

References 44 publications

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

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

Effect of Aging Temperature on the Microstructure and Mechanical Properties of a Novel β Titanium Alloy

Unified Modelling of Flow Stress and Microstructural Evolution of 300M Steel under Isothermal Tension

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