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The microstructure control through the refinement of solidification structure has been studied in an Fe-0.05∼0.30%C-1.0%Mn-1.0%Ni alloy as functions of particle characteristics of TiO x , Al 2 O 3 , ZrO 2 , Ce 2 O 3 and MgO and solidification mode. The numbers of δ and y grains per unit area have been measured in the samples quenched at the start temperatures of y single phase (1 673 K at 0.05% C, 1 743 K at 0.15% C and 1 733 K at 0.30% C). The nucleation event of y phase per one 8 grain per unit area increases with decreasing the lattice misfit parameter between oxide and y-Fe at 0.15 and 0.30% C, not 0.05% C. The results for y grain density whose inverse value corresponds to the y grain size can be explained by the grain-growth-inhibition effect. The y grain size decreases with increasing the Zener pinning force at 0.15 and 0.30% C, not 0.05 % C. The y grain size obtained by quenching at the start temperatures of y single phase for 0.05 % C is considerably higher than that for 0.15 and 0.30% C.

Effect of Oxide Particles on δ/γ Transformation and Austenite Grain Growth in Fe–0.05~0.30%C–1.0%Mn–1.0%Ni Alloy