Determining the conditions for dynamic recrystallization in hot deformation of C–Mn–V steels and the effects of Cr and Mo additions.
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Date
2014
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Abstract
The refinement of microstructure and its homogeneity during controlled hot strip rolling is primarily
achieved by controlling the austenite recrystallization before its transformation during accelerated cooling.
The paper describes the methodology to determine the deformation conditions favorable for dynamic
recrystallization (DRX). Using this methodology it becomes possible to delineate the conditions for postdeformation
static and metadynamic recrystallization as well. The work is based on viscoplastic power law
formalism applied to steady state flow within wide range of deformation temperatures and strain rates.
Two equations of the same form but with different coefficients can be used depending on whether the
steady state flow is controlled by dynamic recovery (DRV) or DRX. The transition from DRV- to DRX at the
corresponding value of Zener-Hollomon parameter Zt can be viewed as the demarcation between static
and metadynamic recrystallization occurring after deformation. The approach is illustrated using low carbon
Mn–V steel. Alloying with Cr and especially with Mo suppresses DRX and MDRX as manifested by
increasing Zt.
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Keywords
Low alloy steels, Hot deformation, Dynamic recovery, Dynamic recrystallization
Citation
MARTINS, C. de A. et al. Determining the conditions for dynamic recrystallization in hot deformation of C–Mn–V steels and the effects of Cr and Mo additions. ISIJ International, v. 54, p. 227-234, 2014. Disponível em: <https://www.jstage.jst.go.jp/article/isijinternational/54/1/54_227/_html/-char/en>. Acesso em: 20 de jul. 2017.