Forced Flow and Solidification Process of Sn-3.5%Pb Melt in Hollow Billet Under Rotating Magnetic Field

摘要

An experimental study with respect to the influence of rotating magnetic field (RMF) on the forced flow, solidification process, and microstructure of Sn-3.5%Pb melt in hollow billet is investigated. The result shows that when the voltage intensity is 100 V, the maximum rotary angular velocity can reach to 30.672 rad/s. While the solidification time is 360 s, the maximum rotary angular velocity is only 2.4 rad/s. The RMF decreases the sump depth and gets the sump shape shallower and flatter. The microstructures are greatly refined with the enhancement of voltage intensities. When the voltage intensity is 100 V, the grain size is refined from 186 to 65 mu m. Consequences on the occurrence by RMF are discussed.