Correlation between Zener-Hollomon parameter and necklace DRX during hot deformation of 316 stainless steel

The aim of this study was to investigate the nucleation of new grains by necklacing mechanism during dynamic recrystallization (DRX). The material used was 316 stainless steel. In order to modeling the deformation behavior during hot rolling, one-hit compression tests were performed at temperatures of 950-1100 degrees C with strain rates of 0.01-1 s(-1). The results showed that at the temperature of 1000 degrees C with the strain rate of 0.1 s(-1), DRX developed by necklace mechanism, it is far from completeness over the steady-state stress. By contrast, the hardness increased by development of DRX. The final microstructure was very heterogeneous and comprises of very fine and coarse grains due to the occurrence of partial DRX. The results also showed that the necklace structure developed by increasing Zener-Hollomon parameter (Z). (c) 2008 Elsevier B.V. All rights reserved.