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<正>A 0.06%C low carbon steel was deformed in torsion over the temperature range 877-917℃in a 2% H2 - Ar gas atmosphere.Strains of 0.25 -5.0 were applied at strain rates ofε= 0.04 s-1 andε= 0.4 s-1 to study the formation of ferrite by dynamic transfo