Ovchinnikov A. Science of materials basis of parts made of complexly alloyed titanium alloys by modificated sub microcrystalline materials

Object of research - structure formation processes and mechanical properties of alpha- and (alpha+beta) - titanium alloys during recovery process of complexly stressed details. Subject of research - laws of structure formation in microcrystalline and sub microcrystalline titanium alloys and formation of properties in welded joints. Aim of research - development of theoretical and applied material science basis for recovering of parts made of complexly alloyed titanium alloys to increase their life time. Research methods: determination of alloys chemical composition was implemented by X-ray spectral and chemical methods. Metallographic examination of structure and fracture surfaces was carried out with use of optical, scanning and electron microscopes. Energy-dispersion X-ray spectral method was chosen for definition of alloys phase composition. Mechanical properties were determined by standard methods. Received results - dependences of complex influence of modifiers (yttrium, lanthanum and boron) on destruction mechanism and properties of welded joints of alpha- and (alpha+beta) - titanium alloys were determined. Recovering technology of complexly stressed details made of high-temperature titanium alloys based on researched regularities of their structure formation and fracture mechanisms of welded joints of (alpha+beta) - titanium alloys were scientifically proofed and experimentally tested. The results were implemented on MOTOR SICH JSC and Zaporozhye Titanium & Magnesium Combine. Application sector - Aircraft engine building.