(1. 钢铁研究总院 高温材料研究所，北京 100081;
2. 北京科技大学 材料科学与工程学院，北京 100083)
摘 要: 为研究新型镍基高温合金GH4282在800~1200 ℃空气中的高温氧化行为，采用静态增重法测定其氧化动力学曲线，并采用金相显微镜、X射线衍射仪、扫描电子显微镜和附带能谱以及电子探针分析仪对表面氧化膜组成、结构和形貌及其截面特征进行观察和分析。结果表明：GH4282合金的氧化动力学符合抛物线规律，氧化初期时氧化质量增加较快，随着氧化时间的延长，氧化质量增加逐渐变得缓慢；合金在800 ℃和900 ℃为完全抗氧化级；在1000~1200 ℃为抗氧化级。GH4282合金的氧化膜分为三层：外层是Cr2O3和TiO2的混合层，并含有少量(Ni,Co)Cr2O4复合尖晶石相；中间层是TiO2和Al2O3的混合层；内层是Al2O3氧化层。
关键字: 镍基高温合金；GH4282；高温氧化；氧化动力学
（1. High Temperature Materials Research Institute, Central Iron and Steel Research Institute, Beijing 100081, China;
2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:In order to investigate the isothermal oxidation behavior of a newly developed superalloy GH4282 in air over the temperature range of 800 ℃ to 1200 ℃, the oxidation kinetics curves were determined by static weighting method. The component, structure and morphology of the surface oxide scale, as well as the characteristics of its cross section were observed and analyzed by metallographic microscope, X-ray diffractomerter (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and electron probe microanalyzer (EPMA). The results show that the oxidation kinetics obeys the parabolic law. The oxidation mass gain grows rapidly during the initial stage of oxidation. With the increase of the oxidation time, the oxidation mass gain gradually slows down. The alloy belongs to the grade of fully oxidation resistance and oxidation resistance over the temperature of 800-900 ℃ and 1000-1200 ℃, respectively. The oxide scale is composed of three layers: the outer layer of Cr2O3 and TiO2 and a small amount of (Ni,Co)Cr2O4 composite spinel, the intermediate lay of TiO2 and Al2O3, and an internal layer of Al2O3.
Key words: Ni-based superalloy; GH4282; high temperature oxidation; oxidation kinetics
