CAJ | 학술논문

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。
침대순배류화상과로풍모적엄중고온양화부식문제,연제출괄용우풍모적고온합금AN1（Cr23Ni32MoNb）,결합금상（OM）、X사선연사（XRD）、장발사소묘전경（FE-SEM）、능보（EDS）등분석방법대풍모시양적미관조직화고온양화성능진행료연구,병여25-20강화316강진행대비분석。결과표명,AN1주태조직위전형적수지상정결구,유오씨체기체화Cr23C6、NbC등정간탄화물조성,고용처리후,지정결구기본소실;1000℃양화100h,AN1적고온양화항력분별위25-20강화316강적2.2화3.8배;AN1양화실험후적표층상결구주요유γ오씨체、Cr2O3화Cr여Mn적복합양화막조성。
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.