Investigation of thermal and structure factors influence on formation of submicrocrystalline structure in oxygen alloyed titanium

Object. Severe plastic deformation realization for titanium alloys with increased oxygen contents is associated with a range of complicacies that arise on step of oxygen introduction into titanium alloys. Temperature deformation parameters considerably influence capability of submicrocrystalline structure obtaining in oxygen-containing titanium alloys regardless of oxygen introduction method. Methodology. Titanium ingots with varied oxygen content obtained after vacuum-arc refining were exploited as incoming billet for severe plastic deformation. Oxygen was introduced into ingots by two methods: during reduction through gaseous phase and by introduction of oxygenated compounds into charge during refining. Severe plastic deformation was carried out by method of screw extrusion. Results. Deformation temperature influence on efficiency of severe plastic deformation for oxygen alloyed titanium was considered. Rupture reasons of some billet parts, obtained from titanium with oxygen-containing compounds, during deformation process by method of screw extrusion were ascertained. Based on microhardness measurement and microstructure investigation optimal temperature modes of severe plastic deformation were determined. Scientific novelty. Conception about joint influence of structure and temperature factors on deformation of titanium alloys with increased oxygen content was extended. Practical value. Utilization of oxygen-containing titanium alloys with submicrocrystalline structure and increased mechanical properties with low cost saving allows to use them instead of complexly-alloyed ones.