Project

I continue to engage in research and development of the SPF / DB technologies produce lightweight structures made of titanium alloys for aerospace applications.

Goal: The purpose of the research and development of experimental technology. The next step is the development of serial technology.

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Project log

Rinat Vladikovich Safiullin
added a research item
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 PJSC «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.
Rinat Vladikovich Safiullin
added a research item
This second part of the article describes the results of studies on technological properties (formability and solid state weldability) of sheet titanium alloy VT6 (Ti-6Al-4V) with improved superplastic properties at low temperatures. When studying the formability of the sheet blanks, the radius of curvature R and average thickness S in the spherical part of the formed samples were determined. The ratio R / S was calculated and represented as a function of the forming time. The presented dependences show that the values of the optimum angle of a conical matrix depend on the forming temperature. The alloy under study had a sufficient formability at temperatures of Т = 750 and 800°C corresponding to the temperature range of the low-temperature superplasticity effect. Studies of solid state weldability of sheet blanks made it possible to establish that with an increase in the welding temperature from Т = 650 to 800°C, the average grain size increased from 1 to 8 μm, while the relative pore length in the zone of the solid-phase joint decreased from 0.21 at T = 650°C to 0.04 at Т = 800°C. The mechanical shear tests of the welded specimens showed that the shear strength of the welded joints varied from 91.4 to 96.9 % of the parent material strength depending on the welding temperature. The study of technological properties revealed that the titanium alloy VT6 could be successfully used in superplastic forming and diffusion welding (SPF / DB) technologies under conditions of low-temperature superplasticity at the temperatures of Т = 700 – 800°С. The effective fabrication of a hollow blade model of a three-layer corrugated structure supports this idea. © 2018, Institute for Metals Superplasticity Problems of Russian Academy of Sciences. All rights reserved.
Rinat Vladikovich Safiullin
added 2 research items
The effect of two stop-off coatings on the structure and hardness of the surface of the titanium alloy VT6 has been investigated. Data for nondestructive diagnostics of the surface layer have been obtained by the method of acoustic emission. Results of this study can be of use for quality control of hollow parts fabricated from titanium alloys.
Rinat Vladikovich Safiullin
added a project goal
The purpose of the research and development of experimental technology. The next step is the development of serial technology.