冷却速度对Fe-4Cr合金奥氏体—铁素体相变的影响  

Effect of cooling rate on austenite-ferrite phase transformation of Fe-4Cr alloy

作　　者：张丽芳[1] 刘永长[1] 

机构地区：[1]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：《材料热处理学报》2011年第9期58-62,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金钢铁联合基金重点项目(50834011)

摘　　要：通过高精度差分膨胀仪记录了Fe-4Cr合金在连续冷却过程中的线膨胀行为,获得其在不同冷速(75、150和330 K/min)下奥氏体→铁素体相变的相关动力学信息,并利用相变动力学模型解析式拟合了Fe-4Cr合金转变体积分数随温度变化的实验曲线。研究表明:冷却速度主要是通过改变晶界之间的位相角来影响动力学参数,即生长激活能QG和指前因子v0,从而影响奥氏体→铁素体相变动力学。Expansion behavior of a Fe-4Cr alloy during austenite-territe phase transformation was studied by a differential dilatometer.Kinetics of austenite-ferrite phase transformation in Fe-4Cr alloy under different cooling rates（75,150,330 K/min） was investigated by fitting the calculated transformed fraction according to developed model based on the experimental data.The results show that cooling rates influence the process of grain growth mainly by changing the density of high angle boundaries which affect the active energy QG and pre-exponential factor v0.

关 键 词：差分膨胀仪 Fe-4Cr合金 动力学模型 

分 类 号：TG111.5[金属学及工艺—物理冶金]