2007, Vol. 43

Issue (6): 595-598 DOI:

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. . Acta Metall Sin, 2007, 43(6): 595-598 .

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Abstract ABSTRACT Superfine Ti-O inclusions are of great importance for the quality of steel.This work adopts directional solidification method to simulate the precipitation of inclusions because of solute enrichment between secondary dendrite, thereby investigates the effect of cooling rate on the size and number of Ti—O inclusions, furthermore verifies a coupled model of microsegregation and Ti-O inclusion precipitation during solidification of liquid steel. The experimental results indicate that the inclusion size is minished, the number is increased and the distribution is more symmetrical when enhancing cooling rates.The average diameters of inclusions are 1.86μm,1.17μm and 0.84μm,the numbers per unit volume are 0.31×104mm-3,1.98×104mm-3 and 3.27×104mm-3 when the cooling rates are 10k/min,100k/min and 200k/min,furthermore it has been proved that superfine inclusions precipitated during solidification is feasible.

Key words: directional solidification superfine inclusion of Ti-O cooling rate coupled model microsegregation

Received: 11 September 2006

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