Fe-Mn-Al与Fe-Mn奥氏体合金的高温氧化性能与组织结构  

Oxidation Behaviour of Austenitic Fe-30Mn-5Al and Fe-25Mn Alloys

作　　者：王新建[1] 朱雪梅[1] 张彦生[1] 吴志立[1] 张瓦利[1] 

机构地区：[1]大连铁道学院材料科学与工程系,辽宁大连116028

出　　处：《大连铁道学院学报》2004年第1期69-73,共5页Journal of Dalian Railway Institute

基　　金：国家自然科学基金资助项目(59901003)

摘　　要：运用循环氧化与增重-时间法、扫描电镜(SEM)及X射线衍射分析(XRD)等技术研究了Fe-30Mn-5Al与Fe-25Mn合金在700℃～800℃空气中氧化的性状 在700℃,Fe-30Mn-5Al合金由于Al的优先氧化在其表面形成了Al2O3薄膜而提高其抗氧化性,氧化动力学规律由Fe-25Mn的直线性(Q0.9631=0 9661×t)规律转变为抛物线规律(Q1.967=0.0869×t) 800℃时,由于氧化物的生长速率指数上升,氧化层显著增厚,循环氧化剥落严重,氧化动力学遵循亚平方抛物线规律(Q1.559=2.49×t) 初步阐明了合金元素Mn。The oxidation behaviour of austenitic Fe-30Mn-5Al and Fe-25Mn alloys in air in the temperature range of 700℃～800℃ was investigated by using mass gain-time of cyclic oxidation, scanning electron microscope and X-ray diffraction techniques. Compared with Fe-25Mn alloy, the oxidation resistance of Fe-30Mn-5Al alloy is improved markedly due to the formation of Al_2O_3 and MnAl_2O_4 at 700℃, and the oxidation kinetics also show a transition from the liner equation of Fe-25Mn (Q (0.9631)= 0.9661×t) to the parabolic equation (Q (1.967)= 0.0869×t). At 800℃,the oxidation kinetics follows a sub-parabolic law (Q (1.559)= 2.49×t) for the growth of oxidizes at 800℃ is much faster than that at 700℃.The effect of Mn and Al elements and oxidation temperature on the oxidizing behaviour of Fe-Mn base alloy are discussed in brief.

关 键 词：铁-锰-铝合金 循环氧化 高温氧化性能 扫描电镜分析 合金组织 X射线衍射分析 

分 类 号：TG135[一般工业技术—材料科学与工程]