冷却方式对铸造Fe_3Al在950℃高温抗氧化性能的影响  

Influence of Cooling Method on High Temperature Oxidation of Cast Fe_3Al Alloy at 950 ℃

作　　者：李亚敏[1] 刘洪军[1] 谢斌[1] 郝远[1] 

机构地区：[1]兰州理工大学有色金属合金及加工教育部重点实验室,甘肃兰州730050

出　　处：《热加工工艺》2010年第9期21-24,共4页Hot Working Technology

基　　金：甘肃省自然科学基金项目(3ZS042-B25-028)

摘　　要：为了研究冷却方式对铸造Fe3Al合金高温抗氧化性能的影响,采用静态增重法测定了水玻璃砂型和金属型铸造Fe3Al合金在950℃空气中的恒温氧化行为,其氧化动力学符合抛物线规律;金属型铸造所得合金的抗氧化性优于水玻璃砂型铸造所得。X射线衍射、扫描电镜和能谱分析表明,Fe3Al氧化膜分为3层:外层主要是A12O3,还有少量的Cr2O3;在氧化层与Fe3Al基体之间存在白色富Al区,富Al区内侧是富Fe贫Al区。In order to investigate the influence of cooling method on the high temperature oxidation of cast Fe3Al alloy,the oxidation behavior of the alloy which was solidified in water glass sand and permanent mould at 950℃ was studied.The oxide films were examined by SEM,X-ray diffraction and EDS.The results indicate that oxidation kinetics obeys parabolic law,and the inoxidizability of the alloy solidification in permanent mould is superior to the alloy solidification in water glass sand.The oxide films are composed of a loose top layer with A12O3,Cr2O3,compact intermediate layer where Al is abundant,as well as internal oxide layer where Fe is abundant and Al is inadequate.

关 键 词：FE3AL 冷却方式 高温氧化 氧化膜 

分 类 号：TG132.3[一般工业技术—材料科学与工程]