Study On Masting Tundish Impurity Control And Mechanical Properties Of Superalloy

The purity of superalloy plays a vital role in the reliability of advanced weapons such as cruise missiles.As an important reactor in the process of superalloy casting,the internal structure of the vacuum metallurgical tundish and the type of slag baffles will have a great impact on the flow characteristics of the superalloy liquid in the tundish and the floating removal of oxide inclusions.Based on the structure of vacuum metallurgy tundish in a domestic research institute,the numerical simulation and practical experimental research on the pouring process are carried out in combination with the actual process.The adaptability of different numerical models is analyzed,and the effect of tundish structure on oxide inclusion removal during steady flow of molten superalloy in tundish is studied,and it is verified by practical experiments.The numerical simulation solution platform is based on the CFD software Fluent,and the 2.5t VIDP furnace and relevant mechanical test equipment are used to carry out the numerical simulation experiment verification.1.Compared with the two methods of the Euler-Euler framework,the dual model of the Euler-Lagrange framework can intuitively characterize the dynamics of oxide inclusions,and the optimal model is the RANS-DPM model;2.The slag baffle without guide hole will form a large range of eddy current area.Compared with the movement state of oxide inclusions in four different slag baffle installation schemes,the front guide hole slag baffle structure is obviously superior to other structures,and the oxide inclusions above 80 microns cannot enter the third area;3.The deflection guide hole slag baffle structure has better removal effect on inclusions.With the decrease of the guide hole diameter,the removal efficiency of largesized inclusions gradually increases,and the removal trend of small-sized inclusions is the same as that of the average residence time;4.The numerical simulation results are in good agreement with the experimental values,indicating that the 5mm deflector guide hole slag baffle has the best impurity removal efficiency.At the same time,the inclusions are affected by the overall movement trend of the alloy liquid,and slip occurs at the free surface;...