Paper Title:
Kinetics of Austenite Grain Growth during a Continuous Heating of a Niobium Microalloyed Steel
  Abstract

Grain growth is a thermally activated process in which the average grain size increases as temperature and time increases. The driving force for grain growth results from the decrease in the free energy associated with the reduction in total grain boundary energy. There are several known factors that influence the migration of grain boundaries such as second phase particles precipitated in the matrix and the solute elements segregated at grain boundaries. The austenite grain boundaries are revealed using the thermal etching method. Carbon extraction replicas were prepared to determine the composition and size of precipitates present in the matrix. In this work, the evolution of the average prior austenite grain size (PAGS) of a low carbon steel microalloyed with niobium is studied as a function of temperature and heating rate. Austenite grains show a two-stage growth. It has been found that as heating rate increases, the grain coarsening temperature (TGC) increases and the grain size at that temperature decreases. TGC temperature lies around 40-60°C below the temperature for complete dissolution of carbonitrides (TDISS).

  Info
Periodical
Materials Science Forum (Volumes 467-470)
Edited by
B. Bacroix, J.H. Driver, R. Le Gall, Cl. Maurice, R. Penelle, H. Réglé and L. Tabourot
Pages
929-934
DOI
10.4028/www.scientific.net/MSF.467-470.929
Citation
D. San Martín, F. G. Caballero, C. Capdevila, C. Carcía de Andrés, "Kinetics of Austenite Grain Growth during a Continuous Heating of a Niobium Microalloyed Steel", Materials Science Forum, Vols. 467-470, pp. 929-934, 2004
Online since
October 2004
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