Research on growth behaviours induced by collision between condensed inclusions in liquid steel and refractory surface

Abstract

The morphologic features of inclusions are expressed with fractal dimension, the growth rate of collision between condensed inclusions and refractory surface are calculated using Matlab software, and then such the theoretical calculation results are verified with water simulation experiments, in order to analyse growth of condensed inclusions induced by collision of the refractory surface; it is shown from the results: The probability of collision between condensed inclusions and refractory surface can be expressed as (S + S_max− r)/(a + S_max); within a cycle of 0.02 s, the maximum movable displacement of less-than-50 μm inclusions is 35.8 μm, and the collision growth rate decreases by 10⁻¹ times over conventional collision growth rate. The obvious increase appears in the growth rate of turbulence collision, and such the rate is much higher than Brown collision and Stokes collision, as the main reason why refractory surface inclusion layer increases gradually.