Perspectives of welded steel-titanium structures application in aircraft engine

Abstract

The paper discusses bimetal construction application prospects in aircraft engine building. An assessment of steel-titanium joints using possibility for the gas turbine engines shafts is given. Of the possible methods of obtaining steel-titanium blanks, the methods of friction welding are highlighted as the most promising for the industrial production of steel-titanium joints with a set of properties that meet the requirements for loaded parts of a gas turbine engine.The performed review of the issues of friction welding of titanium with steel showed that studies of the joints of titanium-based alloys with structural steels, which are of the greatest practical interest for aircraft engine building, are limited to the study of the microstructure of welded joints and the assessment of a limited set of mechanical characteristics. The published results indicate the prospects for the technology of welding titanium with steel, but do not allow the use of the results obtained due to the small number of investigated combinations of materials, with low mechanical characteristics of the joints obtained.The article elaborates a technique for conducting our own search experiment on welding steel 40X with VT6 alloy. The resulting experimental data on the power input during welding, the deformation of parts and the nature of phase transformations in the zone of the forming welded joint are supposed to be used for finite-difference modeling of the temperature field during welding, which will allow, first of all, to get an idea of the processes and conditions that form those observed after welding. structures.