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Improving properties of a low‐carbon microalloyed steel by means of accelerated cooling of dynamically recrystallized austenite
Author(s) -
Kaspar Radko,
Flüß Peter,
Pawelski Oskar
Publication year - 1989
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198901704
Subject(s) - austenite , metallurgy , microalloyed steel , acicular ferrite , materials science , microstructure , ferrite (magnet) , recrystallization (geology) , dynamic recrystallization , thermomechanical processing , homogeneous , composite material , bainite , hot working , thermodynamics , geology , physics , paleontology
Ferrite formation from the ultra‐fine dynamically recrystallized austenite ( d γ < 5 μm) was investigated on a microalloyed steel with 0.11%C. Hot rolling conditions were simulated by the hot deformation simulator Wumsi. Due to accelerated cooling a corresponding fine homogeneous ferrite grain of d α < 2 μm was achieved with a pearlite free acicular microstructure after a cooling rate of more than 20 K/s. Excellent mechanical properties (2.0% proof stress of over 700 MPa and impact transition temperature of ‐180°C) were obtained, superior to those after thermomechanical processing of the same steel without dynamic recrystallization of the low‐temperature austenite.