ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Effect of Dislocation Density in an Unrecrystallized Part of Austenite on Growth Rate of Recrystallizing Grain
Atsuhiko YoshieTakashi FujitaMasaaki FujiokaKentaro OkamotoHirofumi MorikawaHidesato Mabuchi
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1996 Volume 36 Issue 4 Pages 444-450

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Abstract

The growth rate of recrystallizing austenite grains of Si-Mn steels and Nb added steels after hot deformation was investigated by measurement of the fraction of recrystallized austenite and recrystallized austenite grain size. The fraction of recrystallized austenite (Xcr) at which the mechanism of recrystallization changed rrom nucleation and growth (NG) to site saturation (SS) was formulated as a function of Nb concentration and deformation conditions. According to the increase in deformation temperature and strain, Xcr increases while the increase in Nb in solution decreases Xcr.
The growth rate of recrystallizing austenite was also formulated as a function of strain energy (Fv) and Nb concentration. The growth rate decreases rapidly after deformation due to the decrease in Fv. The growth rate also decreases Nb addition.

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