%0 Journal Article
%T A Mixed-control Mechanism Model of Proeutectoid Ferrite Growth under Non-equilibrium Interface Condition in Fe-C Alloys
%A Ruiheng WU
%A Xueyu RUAN
%A Hongbing ZHANG
%A TYHsu
%A <br>T.Y.Hsu
%J 材料科学技术学报
%D 2004
%I 
%X By combining the α/γ interface migration and the carbon diffusion at the interface in Fe-C alloys, a mathematical model is constructed to describe the mixed-control mechanism for proeutectoid ferrite formation from austenite. In this model, the α/γ interface is treated as non-equilibrium interface, i.e., the carbon concentration of austenite at γ/α interface is obtained through theoretical calculation, instead of that assumed as the local equilibrium concentration.For isothermal precipitation of ferrite in Fe-C alloys, the calculated results show that the rate of interface migration decreases monotonically during the whole process, while the rate of carbon diffusion from γ/α interface into austenite increases to a peak value and then decreases. The process of ferrite growth may be considered as composed of three stages: the period of rapid growth, slow growth and finishing stage. The results also show that the carbon concentration of austenite at γ/α interface could not reach the thermodynamic equilibrium value even at the last stage of ferrite growth.
%K Proeutectoid ferrite precipitation
%K Non-equilibrium interface
%K Phase transformation kinetics
%K Mixed-control mechanism<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=324DC3CAB22330DB19158AE0A9B7BFA5&aid=C5AC2906E4925BC9&yid=D0E58B75BFD8E51C&vid=A04140E723CB732E&iid=94C357A881DFC066&sid=B4F9D541F855CF96&eid=CDC418F38C4BFD60&journal_id=1005-0302&journal_name=材料科学技术学报&referenced_num=0&reference_num=14