Research On The Movement Law Of Inclusion Particles In Vertical Centrifugal Casting Of Titanium Alloy

Inclusion is one of the main defects of titanium alloy castings from centrifugal casting.Studying the movement rules of the inclusions during the casting filling process is of great significance for controlling the final residence position of the inclusions and forming good quality titanium alloy castings.This article intends to explore the movement law of inclusions in vertical centrifugal casting of titanium alloy through physical simulation and numerical simulation research,and develop a corresponding numerical simulation system as well as applying it to the optimization of vertical centrifugal casting process of titanium alloy castings.Main tasks as follows:Firstly,based on the physical simulation experimental platform,the fluid filling characteristics and the movement law of inclusions under different centrifugal speeds were studied.The results show that:(a)Inclusion tracer particles with a density less than the fluid appear to adhere to the wall with the fluid,and as the centrifugal speed decreases and the centrifugal speed increases,the wall-attached flow phenomenon turns to be more obvious.(b)The change trend of the velocity of inclusion tracer particles under different centrifugal rotation speeds are similar.Furthermore,the movement speed of inclusion tracer particles decreases with the increase of the centrifugal rotation speed.(c)A typical turbulent vortex appears in the trail of inclusion tracer particles movement.As the mold speed increases,the average radius of curvature of the turbulent vortex increases first and then decreases,and reaches a minimum at 120 r/min.Secondly,the numerical simulation mathematical model of inclusions trajectory in the vertical centrifugal casting filling process of titanium alloy was established.And the corresponding numerical simulation system was developed based on the Inte CAST system.The comparative analysis with the results of the aforementioned physical simulation experiment shows that: the trajectory of the inclusions in the developed numerical simulation system is basically consistent with the physical simulation experimental data.This numerical simulation model can be used to simulate and predict the movement process of inclusions in the filling process of vertical centrifugal casting of titanium alloy castings.Finally,according to the prediction results of the inclusion movement in the filling process,the centrifugal casting process parameters of a titanium alloy support plate part were optimized,and the optimal centrifugal speed was 150r/min.The research results of this paper are of guiding significance for the vertical centrifugal casting process of titanium alloy.The numerical simulation system of the inclusion motion developed in this paper has practical value for the optimization of the vertical centrifugal casting process.