scholarly journals Superplastic forming and pressure welding of multilayer hollow structures Part I. International experience

2012 ◽  
Vol 2 (1) ◽  
pp. 32-35
Author(s):  
R. V. Safiullin
Keyword(s):  
Superplastic Forming ◽  
International Experience ◽  
Pressure Welding ◽  
Hollow Structures

Superplastic Forming and Pressure Welding of Multilayer Cellular Structures

2012 ◽  
Vol 735 ◽  
pp. 409-414 ◽  
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.

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

2012 ◽  
Vol 43 (9) ◽  
pp. 786-788 ◽  
Author(s):  
R.V. Safiullin ◽  
A.A. Kruglov ◽  
A.Kh. Akhunova ◽  
A.R. Safiullin ◽  
S.V. Dmitriev
Keyword(s):  
Titanium Alloy ◽  
Superplastic Forming ◽  
Hollow Structures

Promises of Low-Temperature Superplasticity for the Enhanced Production of Hollow Titanium Components

2016 ◽  
Vol 838-839 ◽  
pp. 610-614 ◽  
Author(s):  
Alexey Kruglov ◽  
Ramil Lutfullin ◽  
Radik Mulyukov ◽  
Minnaul Mukhametrakhimov ◽  
Oleg Rudenko ◽  
...  
Keyword(s):  
Low Temperature ◽  
Biaxial Tension ◽  
Superplastic Forming ◽  
Grain Structure ◽  
Ultrafine Grain ◽  
Processing Temperature ◽  
Hollow Structures ◽  
Enhanced Production ◽  
Ultrafine Grain Structure

Application of the conventional superplasticity (SP) allows producing the unique hollow structures. One remarkable example is the hollow titanium blade of the air engine fan produced by Rolls-Royce. However, high temperature titanium alloys processing (~ 927 °С) limits wide industrial application of the conventional SP. The solution of the mentioned issue can be found through the application of low-temperature SP. Ti-6Al-4V alloy with ultrafine grain structure at the temperature range of 600 ­ 800 °С has enough ductility resources for the superplastic forming (SPF) of the parts with the complicated shape. The formation of pores in Ti-6Al-4V alloy at uniaxial and biaxial tension at the temperature 600 °С is not observed. The effect of low-temperature SP also allows lowering pressure welding (PW) temperature essentially. Herewith, there is a possibility to produce the hollow parts by the combination of SPF and PW. The main goal is the optimization of the technological scheme and processing temperature. The use of the low-temperature SP provides high quality of hollow components such as blades.

Comparison of Technological Properties of Sheet Titanium Alloys VT6 and VST2k

2020 ◽  
Vol 306 ◽  
pp. 33-41
Author(s):  
Rinat Safiullin ◽  
Svetlana Malysheva ◽  
Rafail Galeyev ◽  
Minnaul Mukhametrakhimov ◽  
Arthur Safiullin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Solid State ◽  
Titanium Alloys ◽  
Low Temperatures ◽  
Superplastic Forming ◽  
Technological Properties ◽  
Hollow Structures ◽  
Superplastic Properties ◽  
Processing Properties

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.

scholarly journals Comparison of the simulation results for superplastic forming of two types of multilayer hollow structures

2015 ◽  
Vol 5 (2) ◽  
pp. 207-210
Author(s):  
A. R. Safiullin ◽  
A. Kh. Akhunova ◽  
S. V. Dmitriev ◽  
R. V. Safiullin
Keyword(s):  
Superplastic Forming ◽  
Hollow Structures ◽  
Simulation Results

Technologies for the Manufacturing of Multi-Layered Hollow Structures by Superplastic Forming

2016 ◽  
Vol 870 ◽  
pp. 642-646 ◽  
Author(s):  
N.K. Krioni ◽  
A.D. Mingazhev ◽  
I.R. Kuzeev
Keyword(s):  
Power Plant ◽  
Superplastic Forming ◽  
Aircraft Engine ◽  
Degradation Process ◽  
Multilayered Structures ◽  
Adhesive Bonds ◽  
Hollow Structures ◽  
Engineering And Technology ◽  
Engine Construction ◽  
Technological Defects

Hollow multilayered structures are increasingly used in various fields of engineering and technology. One of the most important applications is шт aircraft engine construction and power-plant engineering. In recent years, the methods of superplastic forming have started to be used to obtain hollow parts specified for different areas. However, despite significant advances in this field, these technologies have several drawbacks, leading to the emergence of technological defects, particularly those associated with the the effect of Baushinger. In this regard, this article discusses the development and study of a technology for production of multilayer hollow constructions by superplastic forming, in particular, degradation process of adhesive bonds in areas, forming cavities in a constructional workpiece. It is shown that the use of more delicate effects to create the breaking away of the load enables the reduction of process defects in the part.

A very rapid in situ Kikuchi technique to determine relative crystal misorientation

1988 ◽  
Vol 46 ◽  
pp. 830-831
Author(s):  
J. I. Bennetch
Keyword(s):  
Electron Beam ◽  
Analytical Techniques ◽  
Superplastic Forming ◽  
The Other ◽  
Kikuchi Pattern ◽  
Kikuchi Line ◽  
Line Analysis

In a recent study of the superplastic forming (SPF) behavior of certain Al-Li-X alloys, the relative misorientation between adjacent (sub)grains proved to be an important parameter. It is well established that the most accurate way to determine misorientation across boundaries is by Kikuchi line analysis. However, the SPF study required the characterization of a large number of (sub)grains in each sample to be statistically meaningful, a very time-consuming task even for comparatively rapid Kikuchi analytical techniques.In order to circumvent this problem, an alternate, even more rapid in-situ Kikuchi technique was devised, eliminating the need for the developing of negatives and any subsequent measurements on photographic plates. All that is required is a double tilt low backlash goniometer capable of tilting ± 45° in one axis and ± 30° in the other axis. The procedure is as follows. While viewing the microscope screen, one merely tilts the specimen until a standard recognizable reference Kikuchi pattern is centered, making sure, at the same time, that the focused electron beam remains on the (sub)grain in question.

“Cavity” formation in superplastically deformed aluminium alloys

1990 ◽  
Vol 48 (4) ◽  
pp. 958-959
Author(s):  
A. Cziráki ◽  
E. Ková-csetényi ◽  
T. Torma ◽  
T. Turmezey
Keyword(s):  
Grain Boundaries ◽  
Aluminium Alloys ◽  
Superplastic Deformation ◽  
Volume Fraction ◽  
Superplastic Forming ◽  
Polished Surface ◽  
Cavity Formation ◽  
Stress Concentrations ◽  
Electron Microscopic ◽  
Commercial Aluminium

It is known that the formation of cavities during superplastic deformation can be correlated with the development of stress concentrations at irregularities along grain boundaries such as particles, ledges and triple points. In commercial aluminium alloys Al-Fe-Si particles or other coarse constituents may play an important role in cavity formation.Cavity formation during superplastic deformation was studied by optical metallography and transmission scanning electron microscopic investigations on Al-Mg-Si and Al-Mg-Mn alloys. The structure of particles was characterized by selected area diffraction and X-ray micro analysis. The volume fraction of “voids” was determined on mechanically polished surface.It was found by electron microscopy that strongly deformed regions are formed during superplastic forming at grain boundaries and around coarse particles.According to electron diffraction measurements these areas consist of small micro crystallized regions. See Fig.l.Comparing the volume fraction and morphology of cavities found by optical microscopy a good correlation was established between that of micro crystalline regions.

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