Microstructure evolution and grain refinement behavior during hot deformation of Fe micro-alloyed Ti-6Al-4V

Dai, Guoqing; Niu, Jitai; Guo, Yanhua; Sun, Zhonggang; Dan, Zhenhua; Chang, Hui; Zhou, Lian

doi:10.1016/j.jmrt.2021.09.009

Cited by 29 publications

(7 citation statements)

References 41 publications

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“…The evolution of the free energy and the internal boundary of this system are shown in Figure 7. It can be seen from the figure that initially round particles are transformed into grains with a number of grain boundaries similar to those observed experimentally in [60]. These results will now be used in the next section for estimation of the sintering stress.…”

Section: Resultssupporting

confidence: 70%

Multi-Scale Modelling of the Bound Metal Deposition Manufacturing of Ti6Al4V

Luchinsky

Hafiychuck

Wheeler

et al. 2022

Thermo

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Nonlinear shrinkage of the metal part during manufacturing by bound metal deposition, both on the ground and under microgravity, is considered. A multi-scale physics-based approach is developed to address the problem. It spans timescales from atomistic dynamics on the order of nanoseconds to full-part shrinkage on the order of hours. This approach enables estimation of the key parameters of the problem, including the widths of grain boundaries, the coefficient of surface diffusion, the initial redistribution of particles during the debinding stage, the evolution of the microstructure from round particles to densely-packed grains, the corresponding changes in the total and chemical free energies, and the sintering stress. The method has been used to predict shrinkage at the levels of two particles, of the filament cross-section, of the sub-model, and of the whole green, brown, and metal parts.

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Section: Resultssupporting

confidence: 70%

Multi-Scale Modelling of the Bound Metal Deposition Manufacturing of Ti6Al4V

Luchinsky

Hafiychuck

Wheeler

et al. 2022

Thermo

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“…The GNDs and the corresponding distribution in sample X at the XY- ( Figure 8 a) and YZ-planes ( Figure 8 c) are displayed in Figure 14 . The GND density can also be estimated according to the results of Dai et al [ 64 ]. The average GND density of sample X in the XY- and YZ-planes is 32.18 × 10 12 m −2 and 25.83 × 10 12 m −2 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Anisotropy in the Tensile Properties of a Selective Laser Melted Ti-5Al-5Mo-5V-1Cr-1Fe Alloy during Aging Treatment

et al. 2022

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In this work, the anisotropic microstructure and mechanical properties of selective laser melted (SLMed) Ti-5Al-5Mo-5V-1Cr-1Fe (Ti-55511) alloy before and after aging treatment are investigated. Owing to the unique thermal gradient, the prior columnar β grains with {001} texture component grow in the building direction, and the mechanical properties of the as-fabricated Ti-55511 alloy exhibit slight anisotropy. Aging treatment creates uniform precipitation of the α phase at the boundaries as well as the interior of β grains. Due to the microstructure of the aged samples with a weak texture, the mechanical properties exhibit almost isotropic characteristics with an ultimate tensile strength of 1133 to 1166 MPa, yield strength of 1093 to 1123 MPa, and elongation from 13 to 16%, which meet the aerospace allowable specification very well. By XRD and EBSD analyses, the total dislocation density of the aged samples (~134.8 × 1013 m−2) is significantly lower than that of the as-fabricated samples (~259.4 × 1013 m−2); however, the aged samples exhibit a higher geometrically necessary dislocation (GND) density (~28.5 × 1013 m−2) compared with the as-fabricated samples GND density (~2.9 × 1013 m−2). Thus, a new approach to strengthening theory for estimating the anisotropic mechanical properties of AM alloys is proposed.

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“…reflects a similar rule, which can be reflected in Figure 3. Therefore, it can be considered that there is a certain linear relationship between ln σ − ln • ε and ln[sinh(ασ )] − 1000/T, which can be fitted and simplified into Equations ( 14) and (15). The values of M and N in the above two equations are only affected by strain rate and deformation temperature, respectively.…”

Section: Arrhenius Equationmentioning

confidence: 99%

“…The role of Fe element in Ti-6Al-4V alloy has also been studied in detail by different researchers. Dai et al [15] found that the addition of Fe can improve the high-temperature plasticity, refine the beta grain size and improve the ductility of the Ti-6Al-4V-xFe(x = 0-0.9 wt-%) alloy. Zhu et al [16] studied the hot deformation behaviours of Ti-6Al-4V-xFe alloy, and found that the addition of Fe element could reduce the flow-stress of the alloy, and meanwhile improved the hot workability of these alloys.…”

Section: Introductionmentioning

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 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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Microstructure evolution and grain refinement behavior during hot deformation of Fe micro-alloyed Ti-6Al-4V

Cited by 29 publications

References 41 publications

Multi-Scale Modelling of the Bound Metal Deposition Manufacturing of Ti6Al4V

Multi-Scale Modelling of the Bound Metal Deposition Manufacturing of Ti6Al4V

Anisotropy in the Tensile Properties of a Selective Laser Melted Ti-5Al-5Mo-5V-1Cr-1Fe Alloy during Aging Treatment

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

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