Superplastic forming of Ti-4Al-3Mo-1V alloy: flow behavior modelling and finite element simulation

Mosleh, Ahmed O.; Котов, А. Д.; Mestre-Rinn, P.; Mikhaylovskaya, A. V.

doi:10.1016/j.promfg.2019.12.042

Cited by 9 publications

(5 citation statements)

References 26 publications

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“…Diffusion bonding involves complex boundary migration and plastic deformation [8][9][10][11]. While most works currently focused on the superplasticity of steels and ferrous alloys [12][13][14][15], very limited research has investigated the diffusion bonding process [16][17][18]. The microstructure evolutions during the DB would certainly determine the mechanical behaviors of the formed parts [19]; thus, the purpose of this study was to explore the effect of initial materials on the bonding joints microstructures.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Grain Size on the Diffusion Bonding Properties of SP700 Alloy

Zhang

Jiang

et al. 2022

Metals

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Superplastic forming and diffusion bonding (SPF/DB) has been recognized as a viable manufacturing technology. However, the basic understanding of grain size and its effects on the quality of diffusion bonds is still limited. In this study, a certain type of SP700 alloy with different grain sizes is bonded at superplastic temperature. The experimental results indicate that the same materials, if coarse-grained, may not readily bond under identical conditions of pressure, temperature, and time. This type of bonding is possible because of the presence of many grain boundaries in fine-grained materials that act as short-circuit paths for diffusion. In addition, grain-boundary migration is also faster in fine-grained than in coarse-grained materials. Fractographic studies show that the dimples on the coarse-grained specimen have large dimensions compared with that in the fine-grained material, indicating that heterogeneous deformation develops in the coarse-grained specimen during tension.

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Section: Introductionmentioning

confidence: 99%

The Effect of Grain Size on the Diffusion Bonding Properties of SP700 Alloy

Zhang

Jiang

et al. 2022

Metals

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“…For titanium parts with complex structures, superplastic forming (SPF) is usually employed in aerospace industries [7][8][9][10]. The superplasticity of Ti-6Al-4V alloy refers to the properties that materials can achieve of great elongation without fracture within a certain range of temperatures (about 900 • C) and strain rates (10 −4 ~10 −2 /s) [11,12]. The requirements of such high temperatures and low strain rates will lead to high costs.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Flow Behavior of Air-Cooling Ti-6Al-4V Alloy after Superplastic Forming

Xiao

Yang

et al. 2022

Crystals

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The flow behavior of Ti-6Al-4V alloy during the air-cooling process after superplastic forming (SPF) has been discussed. In high-temperature constant strain rate tensile tests, the selected temperatures were 930, 900, 800, 700, and 600 °C, and the initial strain rates were 10−2, 10−3, and 10−4/s. The optimized deformation temperatures were 800~900 °C and the strain rates were 10−4~10−3/s. Then, the evolutions of activation energy and deformation strain are also discussed, and the effects of dislocation density and deformation activation energy on flow behavior were consistent. In addition, unstable flow is mainly concentrated in the low-temperature and high strain-rate regions, and this is mainly caused by dynamic recrystallization (DRX). After the SPF process, the possibility of material damage gradually increases during the air-cooling process.

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“…TA32 titanium alloy, as a conventional type of titanium alloy, is widely used to form load-bearing thin-walled structures. These structures are usually formed using hot forming processes, such as superplastic forming [4], hot stamping [5] and hot gas forming [6,7], enabling sufficient ductility and hence success in the forming of the integrated complex structures. The success forming of thin-walled structures is normally indicated by the uniform thickness of the formed components without any defects.…”

Section: Introductionmentioning

confidence: 99%

Study of Alloy Hot Flow and Hardening Behavior Using a New Correction Method for Hot Uniaxial Tests

Peng

et al. 2021

Metals

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The precise characterisation of hot flow behavior of titanium alloys is of vital importance for practical hot forming processes. To precisely determine the hot flow behavior of titanium alloys under the forming conditions, Gleeble hot tensile tests are usually performed to simulate the forming processes by accurately controlling the deformation temperatures and strain rates under designed conditions. However, there exists a non-uniform temperature distribution during the Gleeble tests, which leads to inaccuracies in the determined hot flow behavior. To overcome such an issue, this paper proposed a new strain-based correction method for Gleeble hot tensile tests, enabling the mitigation of the non-uniform temperature-induced stress-strain curve inaccuracies. The non-uniform temperature zones have been successfully excluded in the calculation of the true strain levels. A series of hot uniaxial tensile tests of TA32 at temperatures, ranging from 750 °C to 900 °C, and strain rates, 0.01/s~1/s, were carried out. The obtained stress-strain correlations for a large gauge zone were characterized using the new correction method, which was further used to evaluate the hardening behavior of titanium alloys. The results have shown that the ductility, strain hardening component (i.e., n), strain rate hardening component (i.e., m) and uniform strain value (i.e., ) are over-estimated, compared to conventional method. Higher strain rates and lower temperature leads to enhanced hardening behavior. This research provides an alternative correction method and may achieve more accurate stress-strain curves for better guidance of the hot forming process for titanium alloys.

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Superplastic forming of Ti-4Al-3Mo-1V alloy: flow behavior modelling and finite element simulation

Cited by 9 publications

References 26 publications

The Effect of Grain Size on the Diffusion Bonding Properties of SP700 Alloy

The Effect of Grain Size on the Diffusion Bonding Properties of SP700 Alloy

Investigation of the Flow Behavior of Air-Cooling Ti-6Al-4V Alloy after Superplastic Forming

Study of Alloy Hot Flow and Hardening Behavior Using a New Correction Method for Hot Uniaxial Tests

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