摘要
研究了高铬铸铁氧化动力学和不同氧化温度氧化产物生长形态、结构转变。结果发现:高铬铸铁组织中铁基体和合金碳化物表面生成的氧化物形核生长位置具有较强的选择性,500℃氧化,铁基体表面优先形核,氧化层结构由内层Cr2O3和外层针状Fe2O3组成,600℃以上氧化,氧化激活能增加,外层Fe2O3停止生长,氧化层结构转变为Cr2O3和颗粒状尖晶石型氧化物MnCr2O4复合膜。分析了不同温度下氧化产物转变机理。
The oxidation kinetics, oxide structure and growth morphology of high chromium cast iron were studied under different oxidation temperature. The results show that the oxide nucleation has strong selectivity on the surface of iron matrix and alloy carbide in the high chromium cast iron. The oxide preferentially nucleates on the surface of iron matrix, the oxide scale is composed of Cr203 and needle-liked Fe203 after oxidation at 500 ℃. When oxidation temperature is above 600℃, the oxidation activation energy increases and the growth of Fe203 is stopped. The structure of oxide scale transformes into Cr203 and granular spinel MnCr204. The mechanism of oxidation products transformation was analyzed.
出处
《热加工工艺》
CSCD
北大核心
2013年第4期157-160,共4页
Hot Working Technology
关键词
高铬铸铁
高温氧化
激活能
氧化动力学
high chromium cast iron
high temperature oxidation
activation energy
oxidation kinetics
