Effect of the Coriolis force on the macrosegregation of aluminum in the centrifugal casting of Ti-Al alloys

Joint 5th International Conference on Advances in Solidification Processes;5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining

土木建筑工程;计算机科学

Cisternas Fernández, M.^1 ; Zalonik, M.^1 ; Combeau, H.^1 ; Huang, C.^2 ; Zollinger, J.^1 ; Hecht, U.^2

Université de Lorraine, CNRS, IJL, Nancy

F-54000, France^1

Access E.V., Intzestr. 5, Aachen

D-52072, Germany^2

关键词: 3-D numerical simulation;    Coriolis acceleration;    Gravity conditions;    Macrosegregations;    Reference systems;    Segregation intensity;    Solidification modeling;    Thermosolutal convection;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/529/1/012033/pdf
DOI  :  10.1088/1757-899X/529/1/012033

来源: IOP

【 摘 要 】

Within the framework of the ESA GRADECET project, experiments of directional solidification of cylindrical Ti-Al samples were conducted in hypergravity. The experiments were performed in a centrifuge with the apparent gravity (sum of centrifugal and terrestrial gravity) aligned along the cylinder centerline. 3D numerical simulations of aluminum macrosegregation in these samples are presented. A volume-averaging solidification model is used that accounts for centrifugal and Coriolis accelerations in a non-inertial rotating reference system. We compare the melt flow pattern and the macrosegregation formation under terrestrial gravity and under 20→g centrifugation. The results show that the Coriolis acceleration, although very weak, breaks the symmetry of the thermosolutal convection, having an important impact on the final macrosegregation pattern. The macrosegregation is entirely modified in comparison with a sample solidified under terrestrial gravity conditions. Besides the aluminum segregation intensity increases with the centrifugation level.