MATHEMATICAL MODELLING OF PHASE TRANSFORMATION FROM HOT-DEFORMED AUSTENITE IN LOW CARBON STEELS
来源期刊：Acta Metallurgica Sinica2003年第3期
论文作者：X.H.Liu Y.B.Xu G.D.Wang
Key words：thermodynamics; transformation kinetics; continuous cooling; hot- deformed austenite;
Abstract: On the basis of superelement model, Cahn's transformation kinetics theory and Scheil's additivity rule, the CCT diagrams and transformation kinetics in low carbon steel were predicted considering both undeformed and deformed conditions. The influence of deformation on phase equilibria and transformation incubation period was evaluated quantitatively. The recrystallization kinetics and the evolution of dislocation density were calculated during continuous cooling. The results show deformation considerably shortens transformation incubation period, accelerates transformation kinetics and makes CCT curve shift leftwards. The calculated CCT diagrams and the volume fraction of each phase are in good agreement with measurements.
X.H.Liu1，Y.B.Xu1，G.D.Wang1
(1.State Key Laboratory of Rolling And Automation, Northeastern University, Shenyang,110004, China)
Abstract:On the basis of superelement model, Cahn''s transformation kinetics theory and Scheil''s additivity rule, the CCT diagrams and transformation kinetics in low carbon steel were predicted considering both undeformed and deformed conditions. The influence of deformation on phase equilibria and transformation incubation period was evaluated quantitatively. The recrystallization kinetics and the evolution of dislocation density were calculated during continuous cooling. The results show deformation considerably shortens transformation incubation period, accelerates transformation kinetics and makes CCT curve shift leftwards. The calculated CCT diagrams and the volume fraction of each phase are in good agreement with measurements.
Key words:thermodynamics; transformation kinetics; continuous cooling; hot- deformed austenite;
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