Effects of Pulsed Magnetic Field on Solidified Structure of Ti-bearing Low Carbon Steel

The solidification process of Ti-bearing low carbon steel was controlled by self-developed pulsed magnetic field generator. With the help of metallographic microscope,scanning electron microscope and energy spectrum,the influence rules of the precipitation behavior of inclusions and solidification structure under different discharge voltages were studied. The refining effect with pulsed magnetic field under different solidification cooling rates was analyzed. The results showed that the inclusion size increases at first,then decreases with the increase of discharge voltages,while the number of intragranular ferrite gradually increases,and the grain size becomes smaller and more homogeneous. As the solidification cooling rate decreases,the action time of pulsed magnetic field on the solidification process of liquid steel is extended and the grain refinement effect is more obvious. When the discharge voltages is 80 V and the solidification cooling rate is 60 ℃ / min,the solidification microstructure is almost entirely comprised of fine and interlaced acicular ferrite.