Modelling of superplastic forming of hollow structures with goffered filler made of VT6 titanium alloy

The manuscript considers microstructure, mechanical and processing properties (formability and solid state weldability) of sheet titanium alloy VT6(Ti-6Al-4V) with improved superplastic properties production of JSC «VSMPO-AVISMA Corporation" for the process of superplastic forming at low temperatures and new experimental cheaper sheet titanium alloy VST2k. Complex studies of microstructure, mechanical properties, formability and weldability in the solid state of these titanium alloys were carried out. Studies have shown that both alloys in the temperature range 750-850oC have good weldability in the solid state and exhibit good superplastic properties. Technological properties of the alloy VST2k almost as good as the properties of the alloy VT6. This makes it possible to recommend the sheet alloy VST2k along with the alloy VT6 for the manufacture of hollow structures by SPF/DB in low-temperature superplasticity.

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Superplastic Forming and Pressure Welding of Multilayer Cellular Structures

Materials Science Forum ◽

10.4028/www.scientific.net/msf.735.409 ◽

2012 ◽

Vol 735 ◽

pp. 409-414 ◽

Cited By ~ 1

Author(s):

Rinat V. Safiullin

Keyword(s):

Titanium Alloy ◽

Solid State ◽

Fatigue Testing ◽

Superplastic Forming ◽

Cellular Structures ◽

Pressure Welding ◽

Joint Formation ◽

Academy Of Sciences ◽

Non Destructive

The paper describes the results of long-term investigations on the development of the technology of superplastic forming and pressure welding (SPF/PW) conducted at the Institute for Metals Superplasticity Problems, Russian Academy of Sciences for producing standard articles of aero-space engineering, such as hollow blades, wing and shell panels. The process of solid state joint formation in titanium alloy sheets during SPF was studied. Different investigation techniques were developed. The results of the mechanical and fatigue testing as well as non-destructive inspection of hollow blades are presented. The prospects of the development of the SPF/PW technology are considered and the latest results are discussed.

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Finite element modelling of damage in superplastic forming of a titanium alloy

International Journal of Material Forming ◽

10.1007/s12289-009-0569-7 ◽

2009 ◽

Vol 2 (S1) ◽

pp. 287-290 ◽

Cited By ~ 1

Author(s):

S. B. Leen ◽

M. Stoyanov

Keyword(s):

Finite Element ◽

Titanium Alloy ◽

Finite Element Modelling ◽

Superplastic Forming ◽

Element Modelling

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A Study on Gas Pressure for Superplastic Forming of Titanium Alloy Bellows

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.3051 ◽

2005 ◽

Vol 475-479 ◽

pp. 3051-3054 ◽

Cited By ~ 1

Author(s):

Gang Wang ◽

Jun Chen ◽

X.Y. Ruan

Keyword(s):

Titanium Alloy ◽

Thin Shell ◽

Deformation Theory ◽

Shell Theory ◽

Superplastic Forming ◽

Gas Pressure ◽

Forming Process ◽

Compressive Axial Load ◽

Thin Shell Theory ◽

Gas Pressures

The complex superplastic forming (SPF) technology applying gas pressure and compressive axial load is an advanced forming method for bellows made of titanium alloy, which forming process consists of the three main forming phases namely bulging, clamping and calibrating phase. The influence of forming gas pressure in various phases on the forming process are analyzed and models of forming gas pressure for bellows made of titanium alloy are derived according to the thin shell theory and plasticity deformation theory. Using model values, taking a two-convolution DN250 bellows made of Ti-6Al-4V titanium alloy as an example, a series of superplastic forming tests are performed to evaluate the influence of the variation of forming gas pressure on the forming process. According to the experimental results models are corrected to make the forming gas pressures prediction more accurate.

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Innovative Superplastic Forming Based on In Situ Infra-Red Sheet Heating

Materials Science Forum ◽

10.4028/www.scientific.net/msf.735.415 ◽

2012 ◽

Vol 735 ◽

pp. 415-421 ◽

Cited By ~ 2

Author(s):

Gerard Bernhart ◽

Jean Paul Arcens ◽

Yannick Le Maoult

Keyword(s):

Titanium Alloy ◽

Low Cost ◽

Research Work ◽

Superplastic Forming ◽

Pressure Chamber ◽

Process Route ◽

Refractory Castables ◽

Infra Red ◽

Metallic Sheet

This paper describes the research work that was performed in order to propose an innovative and low cost process route for superplastic forming of aluminum and titanium alloy sheets. The driving idea was to heat only the metallic sheet using heating elements included in the pressure chamber. Several heating configuration have been tested and equipment designs investigated. Based on experimental results and numerical thermal analysis, it was found that halogen heating lamps with a high reflective thermal insulation was the best for the upper pressure chamber, whereas low effusivity Refractory Castables materials seem optimal as low cost forming die. Energy consumption evaluation shows more than 80% energy saving in nominal titanium alloy forming. A pilot forming equipment was developed and first aluminum sheet forming trials give interesting results.

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