A study on diffusion bonding of superplastic Ti–6Al–4V ELI grade

Lee, Ho-Sung; Yoon, Jong Hoon; Park, Chan Hee; Ko, Young Gun; Shin, Dong Hyuk; Lee, Chong Soo

doi:10.1016/j.jmatprotec.2006.11.215

Cited by 64 publications

(24 citation statements)

References 4 publications

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“…Since the investigated alloy exhibited a highly pronounced superplastic behaviour when subjected to a strain rate of 2E-4 s -1 at the working temperature of 850°C [18], a pressure profile able to keep such value was numerically determined using the Abaqus built in routine. Gas pressure was varied ranging from a minimum value of 0.01 MPa up to the maximum pressure level of the press machine (3 MPa).…”

Section: Spf Numerical Resultsmentioning

confidence: 99%

“…The material behaviour in the superplastic field was preliminary evaluated by means of an extensive experimental campaign based on free inflation tests: circular blanks extracted from the above mentioned sheet were heated up to 850°C according to literature [18]; free inflation tests were thus conducted setting either a constant gas pressure or several pressure jumps during the same test. Using data from free inflation tests (dome height as a function of the time), material constants (C and m) for defining the Backofen power law (ߪ = ‫)̇ߝܥ‬ could be evaluated in a strain condition very similar to the one in the real forming process.…”

Section: Methodsmentioning

confidence: 99%

“…Temperature monitoring was provided by K-type thermocouples placed close to both the die and the blankholder surfaces: when a uniform temperature distribution was reached (5°C between the upper and the lower tool) the heating was stopped. Once reached the working temperature, the blank was thus introduced between the tools and then clamped (480 kN); experimental test were carried out setting the same temperature used for characterization purposes (850°C), being this value reported in literature as favourable to emphasize the superplastic properties of the investigated alloy [18]. Before the test, boron nitride was applied on both the surfaces of each blank, in order to make easier the extraction of the formed part.…”

Section: Spf Equipmentmentioning

confidence: 99%

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Biomedical Titanium alloy prostheses manufacturing by means of Superplastic and Incremental Forming processes

et al. 2016

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Abstract. The present work collects some results of the three-years Research Program "BioForming", funded by the Italian Ministry of Education (MIUR) and aimed to investigate the possibility of using flexible sheet forming processes, i.e. Super Plastic Forming (SPF) and Single Point Incremental Forming (SPIF), for the manufacturing of patient-oriented titanium prostheses. The prosthetic implants used as case studies were from the skull; in particular, two different Ti alloys and geometries were considered: one to be produced in Ti-Gr23 by SPF and one to be produced in Ti-Gr2 by SPIF. Numerical simulations implementing material behaviours evaluated by characterization tests were conducted in order to design both the manufacturing processes. Subsequently, experimental tests were carried out implementing numerical results in terms of: (i) gas pressure profile able to determine a constant (and optimal) strain rate during the SPF process; (ii) tool path able to avoid rupture during the SPIF process. Post forming characteristics of the prostheses in terms of thickness distributions were measured and compared to data from simulations for validation purposes. A good correlation between numerical and experimental thickness distributions has been obtained; in addition, the possibility of successfully adopting both the SPF and the SPIF processes for the manufacturing of prostheses has been demonstrated.

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Section: Spf Numerical Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Spf Equipmentmentioning

confidence: 99%

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Biomedical Titanium alloy prostheses manufacturing by means of Superplastic and Incremental Forming processes

et al. 2016

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“…However, the efficiency of the SPF/DB process is relatively low because the strain rate of superplastic forming is very low and the diffusion bonding has to be conducted at high temperature under the protection of inert atmosphere. Therefore, it is important to improve the initial microstructure (such as grain refinement and THP) and optimize the processing conditions which can enhance the superplasticity and reduce the time and temperature of diffusion bonding [145][146][147][148][149][150][151]. Mathematical modeling and numerical simulation can guide the design and optimization of the process and have drawn extensive applications in superplastic forming [152][153][154][155].…”

Section: Fabrication Of Integrally Stiffened Panel Parts By Superplasmentioning

confidence: 99%

Recent developments in plastic forming technology of titanium alloys

Yang

Fan

Sun

et al. 2011

Sci. China Technol. Sci.

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Titanium alloys have been used extensively in industry fields including aviation, aerospace and automobile due to their excellent comprehensive properties. Research and development of advanced plastic forming technology are of great importance to manufacturing titanium products of high performance and lightweight with low cost and short cycle. This paper analyzes the development tendencies of titanium alloy forming technology. Recent achievements in precision forming, microstructure control and multi-scale simulation of titanium alloys are reviewed. The forming techniques of large-sale integral complex components are presented. titanium alloys, precision forming, microstructure control, multi-scale simulation, large-scale integral complex components Citation:Yang H, Fan X G, Sun Z C, et al. Recent developments in plastic forming technology of titanium alloys.

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“…The two-phase α-β Ti-6Al-4V alloy is well known for aerospace applications because of its low density, high strength, excellent corrosion resistance, and good high temperature durability [1,2].…”

Section: Introductionmentioning

confidence: 99%

Effect of Processing Temperature on the Texture and Shear Mechanical Properties of Diffusion Bonded Ti-6Al-4V Multilayer Laminates

Cepeda-Jiménez¹,

Orozco‐Caballero²,

Sarkeeva

et al. 2013

Metall Mater Trans A

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Two multilayer materials based on Ti-6Al-4V alloy have been processed by diffusion bonding at two different temperatures (1023 K (750 ºC) and 1173 K (900 ºC)). The influence of the processing temperature on microstructure, texture and mechanical properties of the two multilayer materials has been analyzed. Scanning electron microscopy, X-ray diffraction, electron backscatter diffraction (EBSD), and shear tests have been used as experimental techniques. The multilayer laminate processed at the lowest temperature of 1023 K (750ºC) presents mainly transversal texture in the longitudinal plane, which provides an anisotropic mechanical behavior, showing higher shear modulus and maximum shear strength under one of the shear test directions considered. In contrast, diffusion bonding at 1173 K (900 ºC) leads to basal/transversal texture due to the partial α→β→α transformation, which provides more isotropic mechanical properties. Accordingly, this laminate shows similar shear modulus and maximum shear strength in different shear test orientations.

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A study on diffusion bonding of superplastic Ti–6Al–4V ELI grade

Cited by 64 publications

References 4 publications

Biomedical Titanium alloy prostheses manufacturing by means of Superplastic and Incremental Forming processes

Biomedical Titanium alloy prostheses manufacturing by means of Superplastic and Incremental Forming processes

Recent developments in plastic forming technology of titanium alloys

Effect of Processing Temperature on the Texture and Shear Mechanical Properties of Diffusion Bonded Ti-6Al-4V Multilayer Laminates

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