循环流化床锅炉风帽合金的组织及抗高温氧化性能研究  

Microstructure and high temperature oxidation resistance research on air nozzle alloy of circulating fluidized bed boilers

作　　者：戴炎彬[1] 游碧龙[2] 刘少光[1,3] 苏茂[1] 赵合勇[1] 徐玉松[1] 

机构地区：[1]江苏科技大学材料科学与工程学院,江苏镇江212003 [2]中国石油化工股份有限公司荆门分公司,湖北荆门448039 [3]浙江科得力新材料有限公司,浙江温州325029

出　　处：《功能材料》2012年第8期1068-1071,1075,共5页Journal of Functional Materials

基　　金：温州市工业科技研发资助项目(G20100060)

摘　　要：针对循环流化床锅炉风帽的严重高温氧化腐蚀问题,研制出适用于风帽的高温合金AN1(Cr23Ni32MoNb),结合金相(OM)、X射线衍射(XRD)、场发射扫描电镜(FE-SEM)、能谱(EDS)等分析方法对风帽试样的微观组织和高温氧化性能进行了研究,并与25-20钢和316钢进行对比分析。结果表明,AN1铸态组织为典型的树枝状晶结构,由奥氏体基体和Cr23C6、NbC等晶间碳化物组成,固溶处理后,枝晶结构基本消失;1000℃氧化100h,AN1的高温氧化抗力分别为25-20钢和316钢的2.2和3.8倍;AN1氧化实验后的表层相结构主要由γ奥氏体、Cr2O3和Cr与Mn的复合氧化膜组成。According to the severe high-temperature oxidation problem of CFB boiler air nozzles, a new superal- loy AN1 （Cr23Ni32MoNb） for air nozzles had been developed. The microstructure and high temperature oxida- tion properties of AN1 alloy had been studied and compared with those of steel 25-20 and steel 316 by using op- tical microscope, Vicker-hardness measurements, X-ray refraction observation, scanning electron microscope and energy dispersion spectrum analysis. The results show that the as-cast microstructure of AN1 alloy exhibit a typical dendritic structure composed of austenite matrix and intercellular carbides such as Cr23 C6 and NbC, and the dendrite disappear after being solid-solution treatment. After being exposed to 1000℃ for 100h, the high-temperature oxidation resistance of AN1 alloy is found respectively to be 2.2 and 3.8 times that of steel 25-20 and steel 316, and the surface phase structures of AN1 alloy consist of γ Cr2O3 and composite oxide Cr-Mn.

关 键 词：循环流化床锅炉 风帽 高温合金 高温氧化腐蚀 

分 类 号：TG174.422[金属学及工艺—金属表面处理]