Structure of sheet blanks from VT6S titanium alloy after local deformation during pulse heating by electric current

The local deformation process of blanks in the form of thin discs from VT6S titanium alloy with the use of pulse heating by electric current and deformation in heated state in the electrodes of the point contact welding machine is studied. The rational values of the process parameters (pulse current, pulse duration and precipitation force) are defi ned. Analysis of the microstructure for the VT6S alloy in its original state and after deformation with heating did not reveal signifi cant increase in grain and the formation of thick alpha layer. The increasing in the plasticity of the VT6S alloy after passing of the current pulse is established. At the same time, in the structure of the deformed zone noted the presence of double.

FROM METALLURGY OF GRANULES TO ADDITIVE TECHNOLOGIES

OJSC «Kompozit» traces its history back to the Central Research Institute of Materials Science (CRIMS) and successfully acts as a leading material science institute in the rocket and space industry up to the present day. The enterprise uses and improves state-of-theart technologies, and creates a variety of new metal, non-metallic, composite and ceramic materials. This article provides an overview of powder sector development from the metallurgy of granules to additive technologies and shows the participation of MISIS graduates. The experience of OJSC «Kompozit» in the manufacturing of parts by selective electron beam melting (SEBM) of home-made VT6S titanium alloy powders. Initial powders are obtained by plasma centrifugal spraying of the bar stock. It is shown that the powders feature an ideal spherical shape, low defect rate, high processability and fully meet the process requirements. The microstructure and properties of samples and parts obtained by the SEBM are studied.