The effect of niobium additions on ferrite formation in CASTRIP steel Conference Paper uri icon

abstract

  • The relationship between niobium concentration, microstructure and mechanical properties has been studied in a production grade and microalloyed low carbon, Mn-Si Ultra-Thin Cast Strip (UCS) steels, produced by the CASTRIP* process. An increase in niobium concentration corresponds to a ferrite grain refinement and an increase in yield strength of over 30%. Increases in yield strength have commonly been associated with either grain refinement, solid solution or precipitate strengthening, however transmission electron microscopy (TEM) of these UCS steels provide no clear evidence of Nb-based precipitate formation. It is therefore thought that strength enhancements are primarily a result of grain refinement, where this occurs due to the enhanced hardenability of the Nb bearing steel, where the addition of Nb results in a lower transformation temperature, leading to a much finer and more acicular ferrite morphology. Institute of Materials Engineering Australasia Ltd.

published proceedings

  • Materials Forum

author list (cited authors)

  • Burgmann, F. A., Xie, Y., Cairney, J. M., Ringer, S. P., Killmore, C. R., Barbaro, F. J., & Williams, J. G.

complete list of authors

  • Burgmann, FA||Xie, Y||Cairney, JM||Ringer, SP||Killmore, CR||Barbaro, FJ||Williams, JG

publication date

  • December 2007