Effects of hydrogen addition on the high temperature deformation behavior of TC21 titanium alloy

Zong, Yingying; Liang, Ying Chun; Yin, Zhong Wei; Shan, De Bin

doi:10.1016/j.ijhydene.2012.02.036

Cited by 33 publications

(4 citation statements)

References 17 publications

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“…The maximum elongation percentage was also obtained at a hydrogen content of 0.18%. Above this level, hydride embrittlement significantly reduced the elongation percentage (Figure b). Based on the engineering stress‐strain curve between 450 and 600 °C, the optimum hydrogen content is 0.18%.…”

Section: Resultsmentioning

confidence: 94%

Effect of Hydrogen on Phase Transformation, Thermal Deformation Behavior, and Forming Limit of TC2 Alloy

et al. 2018

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The present study investigates the effect of hydrogen addition (0-0.44 wt%) on the phase transformation, thermal deformation behavior, and forming limit of TC2 alloy. The α þ β ! β phase transformation point decreases with an increase in the hydrogen content. When the hydrogen content was 0.44%, the α þ β ! β phase transformation point is 720 C, a decrease of more than 200 C compared with the 0H alloy. The optimal hydrogen content is 0.18 wt %, as determined by tensile testing. The ultimate tensile stress of the 0.18H alloy measured at 600 C and a 0.001 s À1 strain rate is 11% lower than that of the 0H alloy, whereas the elongation percentage is 41.5% higher. The results indicate that hydrogen promotes the slip deformation and the dynamic recrystallization of the α phase of the alloy. The forming limit diagrams (FLDs) of the 0H and 0.18H alloys are obtained by bulge testing. The forming limit of the 0.18H alloy is significantly higher than that of the 0H alloy. The FLD 0 value of the 0.18H alloy (0.230) is approximately 16% higher than that of the 0H alloy (0.199), indicating that a 0.18 wt% hydrogen content can effectively improve the plasticity of TC2 alloy.

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Section: Resultsmentioning

confidence: 94%

Effect of Hydrogen on Phase Transformation, Thermal Deformation Behavior, and Forming Limit of TC2 Alloy

et al. 2018

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“…When the deformation temperature falls below 805 • C, the flow behavior of the alloy shows a sharp increase followed by a gradual decrease and eventual stabilization. This indicates that below the phase change point (α + β phase region), primarily recrystallization behavior is exhibited by the alloy, whereas above 805 • C (β phase region), dynamic reversion behavior is observed [41].…”

Section: Analysis Of Deformation Behaviormentioning

confidence: 98%

Ti6Al4V-0.72H on the Establishment of Flow Behavior and the Analysis of Hot Processing Maps

Sun,

Gu,

Zhang

et al. 2024

Crystals

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Significant columnar grains usually occur in the metallurgical microstructure of laser additive manufacturing, and plastic deformation introduced into additive manufacturing can significantly refine grain size. Due to the high deformation resistance and difficult deformation of titanium alloys, reducing the high-temperature deformation resistance of additive manufacturing titanium alloys is essential to facilitating the implementation of online rolling processes. High-temperature compression of titanium alloys was performed on a Gleeble-3800. It was found that the flow stress of the alloy decreased when the strain of the alloy decreased or the deformation temperature increased. The flow behavior of titanium alloys at high temperatures was investigated with the help of a Z-parameter flow model and multiple linear regression model. A positive correlation was found between the experimental and predicted values of the alloy under the multiple linear regression model, with a correlation coefficient of 0.98 and its error of 13.5%, which could better predict the flow stress values. In addition, hot processing maps were established, and the optimal deformation conditions were determined to provide some theoretical guidance for subsequent experiments.

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“…The modified JC constitutive equation can be generated, which is listed below: σ = 128.63 + 488.34ε − 754.22ε 2 + 399.00ε 3 À Á…”

Section: Modified Johnson-cook Modelmentioning

confidence: 99%

“…As a kind of α-phase (hexagonal closepacked) titanium alloy at the room temperature, its poor plasticity makes cold forming cracked easily. With the increase of temperature, the slip systems in the hexagonal close-packed increase, facilitating plastic deformation [3]. Obviously, the deformation behavior of TA2 is sensitive to the processing parameters, such as the strain rate, strain and deformation temperature.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on Johnson–Cook, Modified Johnson–Cook, Modified Zerilli–Armstrong and Arrhenius-Type Constitutive Models to Predict Hot Deformation Behavior of TA2

Zhang

Shang

Yao

et al. 2019

High Temperature Materials and Processes

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The true strain data and true stress data are obtained from the isothermal compression tests under a wide range of strain rates (0.1–20 s−1) and temperatures (933–1,133 K) over the Gleeble-3500 thermomechanical simulator. The data are employed to generate the constitutive equations according to four constitutive models, respectively, the strain-compensated Arrhenius-type model, the modified Zerilli–Armstrong (ZA) model, the modified Johnson–Cook (JC) model and the JC model. In the meanwhile, a comparative research was made over the capacities of these four models and hence to represent the elevated temperature flow behavior of TA2. Besides, a comparison of the accuracy of the predictions of average absolute relative error, correlation coefficient (R) and the deformation behavior was made to test the sustainability level of these four models. It is shown from these results that the JC model is not suitable for the description of flow behavior of TA2 alloy in α+β phase domain, while the predicted values of modified JC model, modified ZA model and the strain-compensated Arrhenius-type model could be consistent well with the experimental values except under some deformation conditions. Moreover, the strain-compensated Arrhenius-type model can be also used to track the deformation behavior more precisely in comparison with other models.

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Effects of hydrogen addition on the high temperature deformation behavior of TC21 titanium alloy

Cited by 33 publications

References 17 publications

Effect of Hydrogen on Phase Transformation, Thermal Deformation Behavior, and Forming Limit of TC2 Alloy

Effect of Hydrogen on Phase Transformation, Thermal Deformation Behavior, and Forming Limit of TC2 Alloy

Ti6Al4V-0.72H on the Establishment of Flow Behavior and the Analysis of Hot Processing Maps

A Comparative Study on Johnson–Cook, Modified Johnson–Cook, Modified Zerilli–Armstrong and Arrhenius-Type Constitutive Models to Predict Hot Deformation Behavior of TA2

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