Effects of heating rate on the alloy element partitioning and mechanical properties in equiaxed α+β Ti-6Al-4V alloy

Zhang, Jinhu; Ju, Hongtao; Xu, Haisheng; Yang, Liang; Meng, Zhichao; Liu, Chen; Sun, Peizhe; Qiu, Junshan; Bai, Chunguang; Xu, Dongsheng; Yang, Rui

doi:10.1016/j.jmst.2021.02.061

Cited by 30 publications

(3 citation statements)

References 29 publications

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“…= ( ) L DT 4 where D is the diffusion coefficient and T is the deformation time with the influence of ΔT added. Because Al is a powerful α phase stabilizer in Ti alloys, the L of DT is roughly regarded to represent the diffusion and migration distance of Al in the β phase [28]. Tables 1 and 2 show the diffusion coefficient (D Al ) and diffusion distance (L Al ) of Al in the β phase.…”

Section: Dynamic Transformation Of α Phasementioning

confidence: 99%

Flow behavior and dynamic transformation of titanium alloy Ti62A during deformation at different temperatures and strain rates

Guan

Xiang

et al. 2023

Mater. Res. Express

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The effect of deformation temperature and strain rate on the hot deformation behavior and dual-phase microstructure evolution of the titanium alloy Ti62A was examined using electron backscatter diffraction. In general, the activation energy of Ti62A during steady-state deformation in the (α + β) phase is 295 kJ/mol. The primary recovery mechanisms of the β phase during hot deformation are dynamic recovery and dynamic recrystallization (DRX). Moreover, discontinuous DRX occurs at low temperatures and high strain rates, whereas continuous DRX occurs at high temperatures and low strain rates. Furthermore, high strain rates in the (α + β) phase and high deformation temperatures are advantageous to dynamic phase changes during dynamic transformation (DT). The β phase penetrates the lamellar αs phase, causing fragmentation and spheroidization of the α<sub>s phase. Finally, DT begins more easily in the fine α<sub>s phase than in the coarse αp phase.

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Section: Dynamic Transformation Of α Phasementioning

confidence: 99%

Flow behavior and dynamic transformation of titanium alloy Ti62A during deformation at different temperatures and strain rates

Guan

Xiang

et al. 2023

Mater. Res. Express

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“…Elements in the alloy diffuse are redistributed in different directions, and the concentrations of alloy elements in α and β phases change, which leads to the changes of α and β micro-components and then affects the microstructure of the alloy. During the cooling process, due to the change of the free energy of the system, a β→ α phase transition occurs, while the Al element diffuses into the newly formed α phase as α stable element, while the V element diffuses into β phase as β stable element, thus promoting the transformation from β phase to α phase and increasing the composition changes in α and β regions [10] .…”

Section: Effect Of Holding Temperature In the Two-phase Zone On Micro...mentioning

confidence: 99%

In-situ Observation of High-temperature Phase Transformation of Ti-6Al-4V Titanium Alloy

Zhu

Yang²,

Lan³

et al. 2023

J. Phys.: Conf. Ser.

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As a typical dual-phase titanium alloy, Ti-6Al-4V has a complex phase transformation process, which is sensitive to temperature parameters and difficult to control its microstructure. To further master the law of phase transformation of Ti-6Al-4V titanium alloy and make a reasonable heat treatment system, different heat treatment systems in β single-phase region and (α+β) two-phase region were made for Ti-6Al-4V titanium alloy, and the phase transformation process and microstructure growth rate of different heat treatment processes were studied by high-temperature confocal microscope. At 1050 °C and 1200 °C in the β single-phase region, the β grain size increases with the prolongation of the holding time and the increase of the holding temperature. The tissue growth rate of the α phase was higher than 1200°C in the cooling process after 1050°C incubation, which was 2.88 μm/s. Based on the heat preservation in the single-phase region, the second heat preservation was carried out for the two-phase region of Ti-6Al-4V titanium alloy at 850 °C and 900 °C. The study found that when the holding temperature was 850°C, the fastest growth rate of the α phase was 4.64 μm/s, which was greater than 3.29 μm/s when the holding temperature was 900°C.

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“…Heating to elevated temperatures is the first and key step in hot forming processes. The microstructure, such as phase and grain size, varies with the forming temperature [ 10 , 11 ], which determines the subsequent hot flow behavior and post-form mechanical properties [ 12 ]. To facilitate the design of reasonable heating variables, particularly heating rate and temperature, a thorough understanding of the correlation between micro and macro-properties, i.e., microstructure evolution and hot flow, at various heating parameters is of vital importance to the hot forming of TC4 sheets.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heating on Hot Deformation and Microstructural Evolution of Ti-6Al-4V Titanium Alloy

Zhu

et al. 2023

Materials

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This paper presents a systematic study of heating effects on the hot deformation and microstructure of dual-phase titanium alloy Ti-6Al-4V (TC4) under hot forming conditions. Firstly, hot flow behaviors of TC4 were characterized by conducting tensile tests at different heating temperatures ranging from 850 °C to 950 °C and heating rates ranging from 1 to 100 °C/s. Microstructure analysis, including phase and grain size, was carried out under the different heating conditions using SEM and EBSD. The results showed that when the heating temperature was lower than 900 °C, a lower heating rate could promote a larger degree of phase transformation from α to β, thus reducing the flow stress and improving the ductility. When the temperature reached 950 °C, a large heating rate effectively inhibited the grain growth and enhanced the formability. Subsequently, according to the mechanism of phase transformation during heating, a phenomenological phase model was established to predict the evolution of the phase volume fraction at different heating parameters with an error of 5.17%. Finally, a specific resistance heating device incorporated with an air-cooling set-up was designed and manufactured to deform TC4 at different heating parameters to determine its post-form strength. Particularly, the yield strength at the temperature range from 800 °C to 900 °C and the heating rate range from 30 to 100 °C/s were obtained. The results showed that the yield strength generally increased with the increase of heating temperature and the decrease of heating rate, which was believed to be dominated by the phase transformation.

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Effects of heating rate on the alloy element partitioning and mechanical properties in equiaxed α+β Ti-6Al-4V alloy

Cited by 30 publications

References 29 publications

Flow behavior and dynamic transformation of titanium alloy Ti62A during deformation at different temperatures and strain rates

Flow behavior and dynamic transformation of titanium alloy Ti62A during deformation at different temperatures and strain rates

In-situ Observation of High-temperature Phase Transformation of Ti-6Al-4V Titanium Alloy

Effect of Heating on Hot Deformation and Microstructural Evolution of Ti-6Al-4V Titanium Alloy

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