作　　者： ; ; ; ; ; ;

机构地区： 东北大学材料与冶金学院轧制技术及连轧自动化国家重点实验室

出　　处： 《钢铁研究》 2004年第5期36-39,共4页

摘　　要： 以规则溶液亚点阵模型为基础,针对Fe-Nb-Ti-C-N系统,进行了热力学平衡计算。计算结果表明,高温阶段的析出相为TiN,微细的TiN强烈地抑制奥氏体晶粒长大;低温阶段的析出相以碳化物(NbTi)C为主,NbC和TiC是抑制奥氏体再结晶及再结晶后晶粒长大的主要因素。析出相形成元素Ti的增加引起其形核化学驱动力增大,并加快析出的动力学过程。 On the basis of regular solution sublattice model, thermodynamic calculation of austenite/carbonitride equilibrium in Fe-Nb-Ti-C-N system is performed in this paper. The calculating results show that nitride TiN is considered as the dominant precipitate in high temperature region and the main contributor to the retardation of austenite grain growth; carbide NbC and TiC are considered as the main precipitates in low temperature region and the main factor to which recrystallization and grain growth are retarded in austenite field during rolling. The increase of precipitate forming elements can raise the chemical driving force of nucleation and accelerate the process of precipitation kinetics.

关 键 词： 微合金钢 碳氮化物 析出 热力学计算

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]