Paper Title:
Characterisation of Bimodal Grain Structures and Their Dependence on Inhomogeneous Precipitate Distribution during Casting
  Abstract

Bimodal grain size distributions were found in continuously cast slab and thermomechanical controlled rolled (TMCR) samples of Nb-microalloyed steel. Scanning electron microscopy (SEM) revealed inhomogeneous distributions of Al- and Nb-containing precipitates, which were found to pin prior austenite grain boundaries during reheating. An effort has been made to establish parameters to quantify the extent of bimodality of reheated and rolled microstructures. Quantification of bimodality using peak grain size range, (PGSR) and peak height ratio, (PHR), is found to match closely with the visual observation of bimodality. Thermo-Calc software was used to predict the sequence of precipitation for different compositions and that could explain the formation of bimodality during reheating.

  Info
Periodical
Materials Science Forum (Volumes 500-501)
Edited by
J.M. Rodriguez-Ibabe, I. Gutiérrez, B. López and A. Iza-Mendia
Pages
613-622
DOI
10.4028/www.scientific.net/MSF.500-501.613
Citation
D.J. Chakrabarti, C. L. Davis, M. Strangwood, "Characterisation of Bimodal Grain Structures and Their Dependence on Inhomogeneous Precipitate Distribution during Casting ", Materials Science Forum, Vols. 500-501, pp. 613-622, 2005
Online since
November 2005
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