Fe-30Mn-9Al奥氏体钢高温循环氧化特征  

CYCLIC OXIDATION OF Fe-30Mn-9Al AUSTENITIC STEEL IN AIR AT 700℃～950℃

作　　者：朱雪梅[1] 王新建[1] 刘明[1] 张彦生[1] 

机构地区：[1]大连交通大学材料科学与工程学院,大连116028

出　　处：《腐蚀科学与防护技术》2005年第1期31-33,38,共4页Corrosion Science and Protection Technology

基　　金：国家自然科学基金项目 ( 5 990 10 0 3 )资助

摘　　要：研究了Fe - 30Mn - 9Al奥氏体钢在 70 0℃、80 0℃和 95 0℃空气中循环氧化 16 0h表面形成的氧化膜形貌、成分和组织结构 .Fe - 30Mn - 9Al奥氏体钢在 70 0℃和 80 0℃氧化时 ,初期增重较快 ,随着循环次数增加 ,氧化增重减小 ,氧化 16 0h分别增重 1 0 0和 4 0 8mg/cm2 .氧化层主要由Mn2 O3 ,Al2 O3 和 (Mn ,Fe) 2 O3 等相组成 .在 95 0℃ ,钢的氧化增重显著上升 ,16 0h增重 4 3 5 0mg/cm2 ,表面形成了Fe2 O3 、MnO2 以及MnAl2 O4、Al2 Fe2 O6等复合氧化物 .80 0℃下循环氧化后形成了多层氧化物膜 ,外层以Mn2 O3 型氧化物为主 ,内层以Al2 O3 为主 ;钢基体表面为富Fe。The surface morphology,constituent and micro-structure of oxide scales formed on Fe-30Mn-9Al austenitic steel oxidized at 700℃,800℃,and 950℃ in air for 160 h were investigated.At 700℃ and 800℃,the oxidation rate of the steel was higher in the initial stage of 2～4 cycles,and then the slight mass gain was measured with a maximum value of about 1 00 and 4 08 mg/cm 2 for oxidation up to 160 h,respectively.The oxide scales were mainly consisted of Mn 2O 3,Al 2O 3 and(Mn,Fe) 2O 3.At 950℃,the high oxidation rate with a final mass gain of 43 50 mg/cm 2 was observed with a scale consisted of Fe 2O 3,MnO 2,MnAl 2O 4 and Al 2Fe 2O 6.After oxidetion at 800℃ for 160 h,Mn enrichment in the outer layer and Al enrichment in the inner layer of the oxide scale were detected together with the Fe enrichment and Mn depletion in the steel matrix below the oxide scale.

关 键 词：循环氧化 奥氏体钢 铁素体 表面 钢基体 氧化膜 相组成 AL2O3 外层 FE2O3 

分 类 号：TQ174[化学工程—陶瓷工业] TG142[化学工程—硅酸盐工业]