Numerical Simulation And Welding Technology Research Of Inertia Friction Welding Process Of GH4169 Ring Parts

Drum parts are the key hot-end parts of aeroengines,which have an important influence on the fuel efficiency,thrust-to-weight ratio and economy of high-performance civil aeroengines and other key parameters.In high-performance aero-engines,the drum components are usually made of Superalloys such as GH4169,and the multi-stage discs are connected by welding.As an advanced solid-state welding technology,inertial friction welding technology has attracted the attention of domestic and foreign OEMs.It has been applied in the manufacture of advanced foreign aero-engine drums and other key components,but it is still in the process of exploration in China.The high-pressure compressor drum component is the key hot-end component of the aeroengine,which has an important influence on the reliability and performance of the aeroengine.Therefore,research on the mechanism and welding process of GH4169 alloy inertial friction welding is of great significance for the localization of high-performance aero-engines.Based on the rigid/plastic friction model,a thermal-mechanical coupled finite element model of inertial friction welding of GH4169 superalloy ring parts was established.The reliability of the numerical model was verified from three aspects:the size of the flash,the amount of axial shortening,and the welding temperature field.Numerical simulation results show that the axial compressive stress on the friction surface close to the inner circle of the workpiece is greater during the whole welding process,and the temperature distribution on the friction surface is uniform during most of the welding process.Research on the process parameters found that the energy input density of the friction surface has a great influence on the welding process.The actual welding test of the solid solution+aging state GH4169 alloy ?60×20 ring parts found that there is an obvious second phase reflow phenomenon in the weld and heat affected zone,which leads to a significant decrease in the microhardness and mechanical properties of the welded joint.If the welding energy density is too high or too low,the joint strength will be reduced.When the welding energy is constant,the parameter combination of high rotation speed and high jacking force will help to obtain a higher strength joint.The post-weld aging heat treatment can effectively restore the content of the main strengthening phase ?" phase in the structure,and restore the strength of the welded joint even more than the base metal.It is obtained under 240MPa friction pressure,600RPM rotation speed,and 105 j/mm2 energy input density After aging heat treatment of the workpiece,the tensile strength at room temperature reached 1358MPa,and the tensile strength at high temperature reached 1144MPa.At the same time,the welding process of ?180×4 thin-walled parts was also studied in this paper.The test found that the influence of welding parameters on joint performance is similar to that of ?60×20 parts.Similarly,the actual energy density required for welding thin-walled parts is lower,and the energy conversion efficiency of the welding machine is also significantly improved.