Numerical Simulation Of Dynamic Recrystallization Behavior Of GH4169 Alloy During Inertia Friction Welding Process

As one of the most advanced solid phase welding technologies,inertia friction welding has been widely used for the connection of aero-engine turbine rotor Parts.Recently,with the development of computer technique and finite element method,the method of numerical simulation based on FEM theory becomes an important tool for the research of inertia friction welding.In the process of inertia friction welding,dynamic reerystallization occurred obviously in the welding area and had a great effect on the ability of welded joints.In this paper,the numerical method was adapted to investigate the dynamic recrystallization.It provides a foundation for quantitatively predicting the dynamic recrystallizaition occurred in the process of inertia friction welding,and plays an important role on optimizing the welding parameters,improving the quality of welded joints and advancing the inertia friction welding technique.In this paper,a 2D axisymmetric thermal-mechanical coupled FE model for inertia friction welding of GH4169 alloy was established using FE software MSC.MARC.The rezone option was presented to improve the precision of calculation in the model.Considering the temperature change during the inertia friction welding process,the addictive rule was introduced to adjust the mathematic model for dynamic recrystallization of GH4169 alloy established by Y.S.Na.By second-development of MSC.MARC,the mathematical model for dynamic recrystallization was combined with the FE model,the routine for data-transmitting that used to cancelling the effect of rezone option was edited.The combined FE model was used to simulate the inertia friction welding process of GH4169 alloy rings.The temperature field,strain/stress field,distribution of dynamic recrystallization fraction and average grain size in the process of inertia friction welding were obtained and analyzed.To verify the FE models,the calculated shape of the welded joints,the distribution of dynamic recrystallization area and the grain size of the welding area were compared to the measured ones.It was concluded that they were in good agreement respectively.