(1. 鋼鐵研究總院 高溫材料研究所，北京 100081;
2. 北京科技大學(xué) 材料科學(xué)與工程學(xué)院，北京 100083)
摘 要: 為研究新型鎳基高溫合金GH4282在800~1200 ℃空氣中的高溫氧化行為，采用靜態(tài)增重法測(cè)定其氧化動(dòng)力學(xué)曲線(xiàn)，并采用金相顯微鏡、X射線(xiàn)衍射儀、掃描電子顯微鏡和附帶能譜以及電子探針?lè)治鰞x對(duì)表面氧化膜組成、結(jié)構(gòu)和形貌及其截面特征進(jìn)行觀察和分析。結(jié)果表明：GH4282合金的氧化動(dòng)力學(xué)符合拋物線(xiàn)規(guī)律，氧化初期時(shí)氧化質(zhì)量增加較快，隨著氧化時(shí)間的延長(zhǎng)，氧化質(zhì)量增加逐漸變得緩慢；合金在800 ℃和900 ℃為完全抗氧化級(jí)；在1000~1200 ℃為抗氧化級(jí)。GH4282合金的氧化膜分為三層：外層是Cr2O3和TiO2的混合層，并含有少量(Ni,Co)Cr2O4復(fù)合尖晶石相；中間層是TiO2和Al2O3的混合層；內(nèi)層是Al2O3氧化層。
關(guān)鍵字: 鎳基高溫合金；GH4282；高溫氧化；氧化動(dòng)力學(xué)
（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
