Analysis of forming titanium welded blanks

Adamus, J.; Lacki, P.

doi:10.1016/j.commatsci.2014.01.055

Cited by 16 publications

(10 citation statements)

References 23 publications

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“…Microstructure of two-phase α+β titanium alloys usually is developed during thermomechanical processing (TMP) consisting of sequential heat treatment and plastic deformation operations [1]. Despite development of new shaping methods for titanium sheets [2,3] superplastic forming seems to be basic technique for manufacturing complex shape products. Forming, based on fine-structure superplasticity (FSS) phenomena, requires fine-grained and equiaxed microstructure in deformed materials.…”

Section: Introductionmentioning

confidence: 99%

The Effect of α-Phase Grains Morphology in Initial Microstructure on Superplasticity of Two-Phase Titanium Alloys

Motyka

Sieniawski

2016

MSF

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It is generally accepted that fine-grained and equiaxed microstructure enables superplastic deformation of two-phase titanium alloys. Appropriate microstructure is usually developed in the thermomechanical processing with careful selection of the parameters of plastic deformation and heat treatment. Based on results of own research in this area increased superplasticity was found in Ti6Al4V alloy having microstructure containing highly deformed and elongated α-grains – considerably different from equiaxed ones. It was found that during heating up and first stage of superplastic deformation fragmentation of elongated α-phase grains occurred, followed by formation and growth of globular grains of that phase. Particular role of quenching of the Ti6Al4V alloy from the stable β-phase temperature range in thermomechanical processing was identified. It leads to increase of elongation coefficient of α-phase grains after plastic deformation but also restrains nucleation of the precipitates of secondary α-phase in further stages of thermomechanical processing. It was established that developed phase morphology of the alloy determined its hot plasticity – especially in the range of low strain rates typical for superplastic deformation.

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Section: Introductionmentioning

confidence: 99%

The Effect of α-Phase Grains Morphology in Initial Microstructure on Superplasticity of Two-Phase Titanium Alloys

Motyka

Sieniawski

2016

MSF

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“…Current activities are aimed at reducing the weight of the structure. Attempts are being made to introduce high-strength alloy steels, such as aluminum or titanium, and their alloys, including welded blanks [ 1 , 2 , 3 ]. Unfortunately, the use of these materials is associated with solving many technological problems, including the spring back and low formability of sheets [ 4 ], or the tendency to create a buildup of the formed material on the tools [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Tribological Aspects of Sheet Titanium Forming

et al. 2023

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Friction, wear, and lubrication are inherent to all metal-forming processes. Unfortunately, they are particularly troublesome when forming titanium materials, which tend to form titanium buildup on the working surfaces of the forming tools. Lubrication is one of the most effective ways to separate contacting surfaces and eliminate galling, thus reducing tool wear. The paper presents the tribological aspects of titanium sheets forming using environmentally friendly lubricants with the addition of boric acid. The lubricant’s effectiveness was assessed on the basis of technological tests, such as the strip drawing test, the Erichsen cupping test, and the formation of spherical drawn parts in industrial conditions. Moreover, the results of the numerical simulation of forming a titanium hat-shaped part are presented. Numerical calculations of forming processes were performed using the PamStamp 2G system based on the finite element method. Both experiments and numerical analyses showed the positive effect of lubricants with boric acid on sheet titanium forming.

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“…Fan and Gao [1] studied single-point electric hot incremental of Ti-6Al-4V titanium sheet and found out that electric hot incremental forming was a complex pyroplastic deformation, and there was a large internal stress in single-point electric hot incremental forming. Adamus and Lacki [2] analyzed the forming of titanium welded blanks using the experimental studies as well as the numerical simulations. The results showed that titanium tailor welded blanks forming with higher strength material were difficult, and a properly selected holding-down force and frictional conditions can significantly facilitate the forming process.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies on the formability of TB5 titanium sheet in rubber cold forming

Chen

et al. 2016

Int J Adv Manuf Technol

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Titanium alloys are often used in aircraft manufacturing. Titanium sheet exhibits low formability and high springback at room temperature, and this causes significant challenges with conventional forming methods. In this study, the phenomena and mechanisms of the formability of TB5 titanium alloys in rubber forming were investigated. It was found that rubber forming was effective for TB5 titanium sheets. Wrinkling in rubber forming was controlled by the side blankholder. The effects of the design parameters of the side blankholder on wrinkling were studied. A typical part was used to investigate the rubber cold forming of TB5. The largest height of the wrinkle became smaller with the increase of the forming pressure, while the hardness of rubber had little effect on the wrinkling. In order to eliminate the wrinkles completely, a wedge was introduced to increase the forming pressure on the shrink flange. Using the wedge, the forming pressure was increased a lot, and the wrinkles were flattened. Springback was controlled by die compensation. Aging treatment was used to increase the strength and part accuracy. After the aging treatment, the internal stress in the cold forming was released. The springback of the flange was corrected.

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Analysis of forming titanium welded blanks

Cited by 16 publications

References 23 publications

The Effect of α-Phase Grains Morphology in Initial Microstructure on Superplasticity of Two-Phase Titanium Alloys

The Effect of α-Phase Grains Morphology in Initial Microstructure on Superplasticity of Two-Phase Titanium Alloys

Tribological Aspects of Sheet Titanium Forming

Experimental and numerical studies on the formability of TB5 titanium sheet in rubber cold forming

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