Hot Gas Pressure Forming of Ti-55 High Temperature Titanium Alloy Tubular Component

Wang, Kehuan; Shi, Chenyu; Zhu, Shiqiang; Wang, Yongming; Shi, Jun; Liu, Gang

doi:10.3390/ma13204636

Cited by 7 publications

(7 citation statements)

References 26 publications

(26 reference statements)

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“…Mosleh et al [18,19] investigated the superplasticity of Ti-6Al-4V and Ti-4Al-1V-3Mo alloys, revealing that samples with larger recrystallized fractions showed better superplasticity and higher quality of the formed parts with a more uniform thickness distribution in cross-section. The effects of microstructure evolutions on the forming process were also discussed by Wang et al [20]. Dynamic recrystallization (DRX) occurs during tensile deformation and can refine the microstructure, thus, the thickness uniformity of the formed part can be improved by increasing the feed length.…”

Section: Introductionmentioning

confidence: 99%

Grain Rotation Accommodated GBS Mechanism for the Ti-6Al-4V Alloy during Superplastic Deformation

Yang

2021

Crystals

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An investigation of flow behavior and the deformation mechanism for Ti-6Al-4V alloy during the superplastic deformation process is presented in this paper. Constant strain rate tensile tests were performed at 890–950 °C and strain rates of 10−2, 10−3, and 10−4/s. Then, surface observation by Optical Microscope (OM), Scanning Electron Microscopy (SEM), and Electron Back-scattered Diffraction (EBSD) was applied to obtain the microstructure mechanism. With pole figure maps (PF) for α-phase, obvious texture gradually changed in the main deformation direction. For the titanium alloy, the evolution of texture in deformed samples was attributed to grain rotation (GR). Significant grain rearrangement occurred between grains after deformation. A complete grain rotation accommodated grain boundary sliding (GBS) deformation mechanism is proposed, which can explain texture evolution without grain deformation.

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Section: Introductionmentioning

confidence: 99%

Grain Rotation Accommodated GBS Mechanism for the Ti-6Al-4V Alloy during Superplastic Deformation

Yang

2021

Crystals

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“…Hence, the minimum tensile temperature was chosen as 850 °C. Titanium alloy thin-walled components are usually formed in the α+β two-phase zone in consideration of the post-form mechanical properties [ 2 , 9 , 13 ]. In this paper, the β transition temperature of the TC31 titanium alloy was confirmed to be 1025 °C by the metallographic method; therefore, the maximum tensile temperature was chosen as 1000 °C.…”

Section: Methodsmentioning

confidence: 99%

“…However, titanium alloys have high strength, poor ductility, and a low Young’s modulus at room temperature, so it is usually necessary to heat titanium alloys to a certain temperature for hot forming, such as hot forging, hot pressing, superplastic forming, and hot gas pressure forming, etc. [ 8 , 9 , 10 , 11 ]. Hot gas pressure forming is a process that can form titanium alloy complex thin-walled components with a relatively high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Softening and Hardening Behavior and the Micro-Mechanism of a TC31 High Temperature Titanium Alloy Sheet within Hot Deformation

2021

Self Cite

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TC31 is a new type of α+β dual phase high temperature titanium alloy, which has a high specific strength and creep resistance at temperatures from 650 °C to 700 °C. It has become one of the competitive candidates for the skin and air inlet components of hypersonic aircraft. However, it is very difficult to obtain the best forming windows for TC31 and to form the corresponding complex thin-walled components. In this paper, high temperature tensile tests were carried out at temperatures ranging from 850 °C to 1000 °C and strain rates ranging from 0.001 s−1 to 0.1 s−1, and the microstructures before and after deformation were characterized by an optical microscope, scanning electron microscope, and electron back-scatter diffraction. The dynamic softening and hardening behaviors and the corresponding micro-mechanisms of a TC31 titanium alloy sheet within hot deformation were systematically studied. The effects of deformation temperature, strain rate, and strain on microstructure evolution were revealed. The results show that the dynamic softening and hardening of the material depended on the deformation temperature and strain rate, and changed dynamically with the strain. Obvious softening occurred during hot tensile deformation at a temperature of 850 °C and a strain rate of 0.001 s−1~0.1 s−1, which was mainly caused by void damage, deformation heat, and dynamic recrystallization. Quasi-steady flowing was observed when it was deformed at a temperature of 950 °C~1000 °C and a strain rate of 0.001 s−1~0.01 s−1 due to the relative balance between the dynamic softening and hardening. Dynamic hardening occurred slightly with a strain rate of 0.001 s−1. Mechanisms of dynamic recrystallization transformed from continuous dynamic recrystallization to discontinuous dynamic recrystallization with the increase in strain when it was deformed at a temperature of 950 °C and a strain rate of 0.01 s−1. The grain size also decreased gradually due to the dynamic recrystallization, which provided an optimal forming condition for manufacturing thin-walled components with the desired microstructure and an excellent performance.

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“…However, the above research was established on cold forming conditions, in which dislocation-based monotonous hardening dominates. For middle temperature range and relatively high strain rate forming conditions, several research has identified the beneficial effect of quick loading on the deformation uniformity [10,11], which is attributed to the cooperative function of strain and strain rate dual hardening on the enhancement of overall hardening, the researches were still limited to qualitative study without effective quantification.…”

Section: Introductionmentioning

confidence: 99%

Phenomenological model of hardening and flow for Ti-6Al-4 V titanium alloy sheets under hot forming conditions

Peng

Zheng

et al. 2022

Int J Adv Manuf Technol

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Hardening is the core factor to determine deformation uniformity in sheet metal forming.Hot deformation of titanium alloy sheets encounters the coupled effects of strain hardening, strain rate hardening and softening, which makes the determination of forming parameters aiming for an enhanced hardening very difficult in practical processes. This paper presents a new model to quantify the hardening of Ti-6Al-4V titanium alloy sheets under hot forming conditions based on the underlying correlation between uniform strain and hardening. Firstly, to precisely determine hot deformation characteristics of titanium alloy sheets, hot tensile uniaxial tests using Gleeble systems at various strain rates of 0.01-1 s -1 and temperatures of 973-1123 K were performed systematically. A newly developed volume-based correction method for stress-strain curves of Gleeble thermo-mechanical testing was proposed to eliminate the damaging effect of temperature gradients on strain calculations, which enables the strain hardening, strain rate hardening and softening to be determined precisely. Then, a simple unified formula of hardening components (n, m and s) was proposed to predict the achievable uniform strain at certain conditions efficiently. Using which, occupation of each hardening can be quantified and compared to facilitate the determination of process parameters.Finally, a phenomenological model based on the hardening and softening components was developed to predict the hot flow behaviour. The proposed quantitative model can provide an efficient and useful approach for process designers to design process parameters driven by the objective of enhancing hardening to maximize uniform deformation during hot forming of titanium alloy sheets.

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Hot Gas Pressure Forming of Ti-55 High Temperature Titanium Alloy Tubular Component

Cited by 7 publications

References 26 publications

Grain Rotation Accommodated GBS Mechanism for the Ti-6Al-4V Alloy during Superplastic Deformation

Grain Rotation Accommodated GBS Mechanism for the Ti-6Al-4V Alloy during Superplastic Deformation

Dynamic Softening and Hardening Behavior and the Micro-Mechanism of a TC31 High Temperature Titanium Alloy Sheet within Hot Deformation

Phenomenological model of hardening and flow for Ti-6Al-4 V titanium alloy sheets under hot forming conditions

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