Seliverstov O. Properties increasing of welded joints of the ВТ8 titanium rotor parts for gas-turbine engines.

The research subject is the processes of structure formation and mechanical properties of welded joints of titanium alloy BT8, which is used for the rotary parts of turbine engines. The research object is the regularities of formation of structure and mechanical properties of welded joints of complexly alloyed two-phase titanium alloy BT8. The aim of the research is to ensuring the required level of properties of welded joints of aircraft parts of complexly alloyed two-phase titanium alloy in different structural status. The research methods: Chemical composition was determined by x-ray spectrometry and chemical methods, the structural components of an energy dispersive x-ray spectrometry method. The metallographic studies of the structure and study fractograms of fracture surface were performed using optical, scanning and transmission electron microscopes. The modeling of the stress-strain state of parts was performed using the program ANSYS. The results attained: The new, regularities of the influence of different welding methods, different types of source structure and mechanical properties of welded joints of alloy BT8. Given the size and mechanical properties of welded joints the obtained mathematical models and the methodology for determining zones of optimal arrangement of the welds in the manufacture and repair of rotor parts of the compressor. Introduced at Plant JSC "Motor Sich". Area of application - enginebuilding.