Segregation behaviour in Nb microalloyed steels

Claire Davis, Martin Strangwood

Research output: Contribution to journalArticle

12 Citations (Scopus)


Four continuously cast slabs from two sources were characterised by optical microscopy and scanning electron microscope energy dispersive X-ray spectroscopy (SEM-EDS) in the as cast state and after normalisation close to the Ae(3) temperature. For all four slabs the composition of the majority of the slab depth (>80%) was the bulk composition and in this region microsegregation, particularly of Nb, was found to agree with predicted partition ratios from equilibrium thermodynamics. For two of the slabs, which gave final solidification as single phase austenite, equilibrium thermodynamics were also able to predict the compositional centreline macrosegregation. In the other two cases, this simple approach was not successful, which has been ascribed to solidification as a more complex phase mixture (austenite and delta-ferrite) or more complex processing during solidification (e. g. soft reduction).
Original languageEnglish
Pages (from-to)1126-1133
Number of pages8
JournalMaterials Science and Technology
Issue number9
Publication statusPublished - 1 Sept 2009


  • Microsegregation
  • Macrosegregation
  • Microalloyed steel


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