TWO-PHASE FLOW SIMULATION ON HOLLOW BILLET SOLIDIFICATION UNDER ROTATING AND TRAVELING MAGNETIC FIELDS

A new electromagnetic stirring method special for big diameter hollow billet has been developed by our group. The idea is that the stirring coils are placed at the interior of hollow billet but not the exterior as usual. In order to evaluate the stirring efficiency of the new method, a two-phase flow model with considering the electromagnetic field effects is proposed to study the solidification process of Sn- 3.5%Pb hollow billet. The effects of stirring flows induced by rotating and traveling magnetic fields on temperature, concentration and grain diameter are numerically studied and analyzed. The following results can be acquired: 1) Traveling magnetic field and rotating magnetic field can induce two different pattern flows. Both flows can refine the grains in hollow billet. The bigger the stirring velocity, the smaller the grain diameter is. 2) Both flows can result in the macro-segregation in the hollow billet. The bigger the stirring velocity, the serious the macro-segregation is. But the segregation maps caused by different stirring magnetic fields are distinctly different. 3) The experimental results show that the developed stirring technology has quite good efficiency of grain refinement for the hollow billets.
Hollow billet Two-Phase flow Traveling magnetic field Rotating magnetic field Simulation
Tongmin Wang Qi Zhang Tingju Li Junze Jin
School of Materials Science and Engineering & State Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian 116024, China
国际会议
大连
英文
559-566
2007-08-19(万方平台首次上网日期,不代表论文的发表时间)