The multifractal of ultra low carbon steels containing titanium organizations

Abstract

Abstract. Steel samples under different pulse magnetic field are produced using self-developed pulsed magnetic field generator, and the discharge voltage of the pulsed magnetic field selected from the experiment is 0V, 40V, 80V, and 100V four gradient levels. The morphology of the microstructure is photographed by metallographic microscope, then the calculation of the multi fractal software，which is designed by Visual C++，of the optical image input is carried out. The distribution patterns of different pulse magnetic fields have been quantitatively characterized by the results of the calculation. With the increase of the discharge voltage, ( Multifractal spectrum width) decreases from 0.481338 to 0.439.5 and then increases to 0.545596, which explains process of the change from uniform to uniform to uneven and more complicated organizational structure; (multifractal spectrum) ＞ 0, the fine microstructure dominated，the increased proportion of intracrystalline ferrite.