Influence of Accumulated Stress in Austenite on Transformed Ferrite Grain Size by Hot Rolling for a V-microalloyed Steel

Torsion test rolling simulations have been performed in different conditions (pass strain, interpass time) for a V-microalloyed steel (C=0.165; V=0.170 wt%). The accumulated stress (Δσ) in austenite at temperatures below the no-recrystallisation temperature (Tnr) has been measured. The accumulated s...

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Bibliographic Details
Published in:ISIJ International 2008/09/15, Vol.48(9), pp.1263-1269
Main Authors: Medina, Sebastián F., Gómez, Manuel, Rodríguez, Elisabeth, Rancel, Lucía
Format: Article
Language:English
Subjects:
accumulated stress
Applied sciences
Exact sciences and technology
hot rolling
interpass time
Metals. Metallurgy
simulation
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Summary:Torsion test rolling simulations have been performed in different conditions (pass strain, interpass time) for a V-microalloyed steel (C=0.165; V=0.170 wt%). The accumulated stress (Δσ) in austenite at temperatures below the no-recrystallisation temperature (Tnr) has been measured. The accumulated stress is directly related to the dislocation density. The ferrite grain size (Dα) obtained after hot rolling simulations for different conditions and a cooling rate of 3.5 K/s has been measured. Dα is found to be dependent on Δσ and on the austenite grain size prior to the austenite–ferrite transformation during cooling. On the other hand, a higher strain accelerates recrystallisation between passes, lowers the Tnr value, and consequently leads to a smaller accumulated stress. It is seen that a minimum value of 15 MPa must be reached in order for Dα refinement to begin.
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.48.1263