Effect of Particle Size Distribution on Austenite Grain Growth in Fe-0.05mass%C Alloy Deoxidized with Mn-Si, Ti, Mg, Zr and Ce

摘要

The austenite grain growth in an Fe-0.05mass%C alloy deoxidized with Mn-Si, Ti, Mg, Zr and Ce has been studied as a function of holding time at 1 200℃ and inclusion characteristics such as particle diameter, d_V, number and surface area, A_V~P, of particles per unit volume and volume fraction of particles. The mean limiting diameters of grains obtained by the Zener, Doherty et al. and Nishizawa et al. relations are compared with those observed experimentally and calculated by the relationship between surface area of particles, A_V~P, and grains, A_V~G, per unit volume. The contribution of small size particles with d_V < 0.5 μm to limiting grain size is estimated for the particles with uniform size, log-normal size distribution and observed size distribution.