Abstract
The effect of silicon on grain refinement has been investigated in industrially produced Nb microalloyed steel. The synergistic effect of silicon in the presence of Nb is found to favour grain refinement in hot rolled strip, which has resulted in very fine ferrite grains of <3; μm. Evolution of such a fine grain has been related to the enhanced precipitation of Nb(CN) in the presence of silicon. The concept of effective niobium (Nb + Si) in such steels has been introduced.
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