The Dynamic Recrystallization of Hot-Deformed Austenite in a Micro-Alloyed Steel

Abstract:

As the dynamic recrystallization (DRX) behavior of hot-deformed austenite is the basis of determining controlled rolling schedule for steel, in the present work, the dynamic recrystallization behavior of austenite of a 0.22%C-1.30%Mn-0.04%Nb micro-alloyed steel was investigated by means of high temperature compression tests on the Thermecmastor-Z simulator. By the analysis of true stress-strain curves at different deformation stages, the hot deformation equation of austenite was established for the steel. As a result, the energy to induce recrystallization of austenite for the steel is 419.1 kJmol^-1, as it was influenced by the drag effect of micro-alloyed element Nb in solid solution. The ratio (σ_c/σ_p) of critical stress σ_c (where DRX occurs) to peak stress σ_p is 0.93 while the ratio (ε_c/ε_p) of critical strain ε_c to peak stress ε_p is 0.52 for the steel. The austenite grain size of dynamic recrystallization of the micro-alloyed steel is refined by decreasing the deformation temperature and improving the stain rate.

• Periodical: Materials Science Forum (Volume 724)
• Pages: 287-290
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.724.287
• Online since: June 2012
• Authors: Yuan She, Zhao Hui Zhang, Jun Yang, Jian Tao Ju
• Keywords: Austenite, Dynamic Recrystallization (DRX), Hot-Deformation, Microalloyed Steel

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