Effect of Nonrandomly Dispersed Particles on Austenite Grain Growth in Fe–10mass%Ni and Fe–0.20mass%C–0.02mass%P Alloys

抄録

The fraction of deoxidation particles of MgO, ZrO₂ and Ce₂O₃ on austenite grain boundaries in an Fe–10mass%Ni or Fe–0.20mass%C–0.02mass%P alloy has been measured as a function of dissolved Ce content. The fraction of particles on grain boundaries, Φ_A, which is defined by the ratio of the number of particles at the grain boundaries per unit area and the number of particles at the grain boundaries and the interior of the grain per unit area and the Φ_A value at random dispersion, Φ_R(2-D), attend the steady state within 60 min holding at 1 673 K. The Φ_A and Φ_R(2-D) values increase with the addition of very small amount of dissolved Ce and thereafter are independent of dissolved Ce content. The D_A/d_A (limiting mean grain diameter/mean particle diameter) ratios decrease with an increase in Φ_A for a given volume fraction of particles.