This paper reports on investigations of the solid state formability and weldability Ti–6Al–4V titanium alloy sheet with submicrocrystalline structure (grain size 0·5 0·8 μm) under superplastic conditions at temperatures 700 800°C. It has been established that condition material reduces temperature forming (SPF) by 200°C diffusion bonding (DB) 100°C, compared to conventional microcrystalline 3 μm). Unlike commercially available sheet, submicron grained is characterised isotropic formability....

Mechanical properties of a Ti2AlNb-based intermetallic alloy both at room and elevated temperatures were considerably improved due to formation homogeneous microstructure with the average grain size about 300 nm. At temperature, elongations up 25% obtained ultimate strength reached 1400 MPa. The exhibited superplastic behavior in temperature range 850-1000°C. maximum elongation 930% steady state flow stress 50 125 MPa 900°C strain rate 4.210-3 s-1. nanostructured material was used for...

A critical analysis of approaches to find constitutive relations from the tests on uniaxial and two axial loading is presented. Then we report methodology fitting parameters for superplastic forming based results cone cup elongated wedge tests. Optimal angles are estimated analytically also finite element simulations. Our comparison experimental numerical simulations corresponding in frame commercial software such as ANSYS10.0 (ED). We carry out different sets chosen relation values friction...

Abstract The superplastic forming process of the VT6 titanium alloy three‐layered hollow structures with goffered filler are investigated. Based on results experimental studies and finite element modeling, we determine rational parameters such as gas pressure increase rate, when flow condition is satisfied for ribs, processing time minimal.

Nickel-iron Alloy 718 is widely used for fabricating parts by superplastic deformation. Refinement of grains down to a nanostructure (NS) size improves the alloy’s processing properties. Thermomechanical treatment has been carried out form NS state in bulk alloy multiple isothermal forging (MIF) at gradually decreasing temperatures. Investigation properties and behavior performed. The with grain 80 nm displays superplasticity (SP) temperature which lower than conventional fine grained about...

The paper describes the results of comprehensive studies microstructure, mechanical and technological properties (formability weldability in solid state) titanium sheet alloy VT6 (Ti-6Al-4V) with improved superplastic produced by PSC «VSMPOAVISMA». first part is investigated initial microstructure its over a wide temperature range from 650 to 900ºC at strain rates 4×10-4, 4×10-3 4×10-2 s-1. It found that uniform, ultrafine grains have an average size 1.2 microns. grain be 0.1 4 Most 0.5 1.5...

The second part of the article describes results research technological properties (formability and weldability in solid state) a sheet titanium alloy VT6 (Ti-6Al-4V) with improved superplastic at low temperatures. In studies formability blanks, radius curvature R average thickness S spherical portion formed samples were determined. ratio / was calculated is represented as function forming time. presented dependences show that values optimal angle conical matrix depend on temperature. At...

In the Part II of review we describe results long-term investigations conducted at Institute for Metals Superplasticity Problems RAS (IMSP RAS) related to development technology superplastic forming and pressure welding (SPF/PW). I international experience was described.

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

Application of the conventional superplasticity (SP) allows producing unique hollow structures. One remarkable example is titanium blade air engine fan produced by Rolls-Royce. However, high temperature alloys processing (~ 927 °С) limits wide industrial application SP. The solution mentioned issue can be found through low-temperature Ti-6Al-4V alloy with ultrafine grain structure at range 600 ­ 800 °С has enough ductility resources for superplastic forming (SPF) parts complicated shape....

The method to calculate the pressure time cycle for case of superplastic forming a long rectangular diaphragm is suggested in this paper. Simplified model process developed by using principal equations thin shell theory. approach involved enables one obtain analytical expression calculating gas dependency providing constant strain rate deforming shell. Material properties have been estimated means same technological equipment which exploited under consideration. Such an provides identity...

(2000). Highly Superplastic Ti-6AI-4V sheet for Forming and Diffusion Bonding. Materials Technology: Vol. 15, No. 2, pp. 133-135.

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

The paper describes the results of long-term investigations related to development technology superplastic forming and pressure welding (SPF/PW). Part I presents international experience for processing standard articles aerospace engineering, such as hollow blades, wing shell panels. prospects SPF/DB are considered latest discussed.

Laminated composite materials consisting of an orthorhombic Ti 2 AlNb based alloy and ( α+ β) titanium have been fabricated at a laboratory scale using two-step process involving diffusion bonding hot rolling. The feasibility fabrication two three layered with high quality between layers was demonstrated. Preliminary assessment the tensile mechanical properties obtained showed that they were superior to those slightly inferior alloy.

The as-cast and hot worked microstructures of the newly developed β-solidifying ingot-metallurgy Ti-45Al-X (Nb,Mo,B) alloy its superplastic properties in condition have been studied. obtained experimental findings were used for research forming diffusion bonding sheet products, which cut out preform by spark cutting. It was shown that might be successfully applied to fine-grained materials. Relatively low temperatures pressures found sufficient achieve sound joints material.

The work is devoted to the development of production three‐layered hollows structures made VT6 titanium alloy by means superplastic forming (SPF). Based on numerical results pressure cycle was determined satisfy flow condition in stiffening ribs and minimize time.