Fe-9Cr合金在连续冷却过程中的奥氏体→铁素体相变动力学  

Austenite-ferrite transformation kinetics of Fe-9Cr alloy during continuous cooling

作　　者：张丽芳[1,2] 刘永长[2] 

机构地区：[1]天津商业大学理学院,天津300134 [2]天津大学材料科学与工程学院现代连接技术天津市重点实验室,天津300072

出　　处：《金属热处理》2012年第1期29-33,共5页Heat Treatment of Metals

基　　金：国家自然科学基金钢铁联合基金重点项目(50834011)

摘　　要：通过分析由高精度差分膨胀仪所记录的Fe-9Cr合金试样在连续冷却过程中的膨胀曲线,获得了试样在奥氏体(γ)→铁素体(α)转变过程中的相关动力学信息;并进一步利用等时转变动力学模型拟合了Fe-9Cr试样中铁素体转变体积分数随温度变化的试验曲线。根据动力学参数的拟合结果得出:晶核的形成主要是依靠母相中单个原子的热激活跃迁,而晶核的长大则是以原子的集体热激活跃迁为主。Austenite→ferrite phase transformation kinetic information in Fe-9Cr alloy during continuous cooling was obtained with the analysis of dilatometric curves,which was recorded by high-resolution differential dilatometer.Furthermore,the experimental curve of ferrite fraction varying with temperature was fitted by isochronal phase transformation kinetic model.The fitting results for kinetic parameters indicate that the formation of nucleation is mainly determined by a single atomic thermal activation jump in the matrix,while the growth of nucleation is mainly controlled by groups of atomic thermal activation jump.

关 键 词：差分膨胀仪 Fe-9Cr合金 相变动力学模型 

分 类 号：TG111.5[金属学及工艺—物理冶金]