DB-SPF Processing Of Hollow Blade For TC4Titanium Alloy

Engine is the essential components to the aviation aircraft parts, the property ofaviation aircraft depends largely on the level of the engine, thrust-weight ratio isone of the most important indicators that reflects the level of engine, the weight lossof engine can improve thrust-weight ratio, and hollow blade can reduce the weightof the engine, so the DB-SPF of hollow blade is of great importance to weight lossof engine.In this paper， the DB-SPF of hollow blade were studied. Through the hightemperature tensile experiment of TC4titanium alloy, the best material deformationtemperature could be obtained, the strain rate sensitivity m and k could also be got.The DB，hot forming and SPF of TC4titanium alloy were studied and the bettertitanium alloy hollow blade was formed； at the same time, the current auxiliaryforming and SPF/DB was combined and the current auxiliary diffusion bondingwere studied and the advantages of the current auxiliary diffusion bondingcompared to traditional diffusion bonding were analysed.Firstly, through the high temperature tensile experiment of TC4titanium alloy,the best elongation appeared when the temperature was920℃and the bestelongation was800%, the optimum forming temperature and the parameters of thematerial at this temperature were confirmed. Through the DB，hot forming and SPFof TC4titanium alloy,the hollow blade was formed, the optimum experimentalparameters was determined, the better hollow blade was formed, the thicknessdistribution of core plate and the connection of the panel and core plate wasanalyzed, through the line scanning analysis of the diffusion bonding joint, thequality of the diffusion bonding joint was judged.Through the current auxiliary diffusion bonding, the temperature wasconfirmed，and the current size, pressure, heat holding time and other parameterswas identified; the connection of the panel and core board were analyzed, thepressure of the diffusion bonding and the time of heat holding time on the quality ofthe diffusion bonding joints were explored，the current auxiliary diffusion bonding and the traditional diffusion bonding was compared, the difference of two kindsprocess on the heating time and the change of grain size were explored.