Incoloy800H合金在高温纯水蒸气中的氧化行为  

Oxidation Behaviour of Incoloy800H Alloy in High-Temperature Pure Steam

作　　者：杨珍[1] 鲁金涛[1] 乐明[1] 周永莉[1] 李浩[1] 袁勇[1] 

机构地区：[1]西安热工研究院有限公司电站锅炉煤清洁燃烧国家工程中心,西安710032

出　　处：《机械工程材料》2018年第1期1-6,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51401163)

摘　　要：采用不连续称重法、X射线衍射及扫描电子显微镜等研究了Incoloy800H合金在750℃和850℃纯水蒸气中的氧化行为。结果表明:试验合金的氧化动力学近似遵循抛物线规律,温度升高后其氧化急剧加速;在750℃蒸汽中氧化后,试验合金表面形成以(Cr,Mn)_2O_3为主的氧化膜,其上分布着不连续呈突起状的Fe_3O_4,在氧化膜下方基体中的铬被内氧化为Cr_2O_3;在850℃蒸汽中氧化后,试验合金表面形成双层氧化膜,外层为薄的(Fe,Mn)_3O_4,内层为厚的(Cr,Mn)_2O_3,氧化膜下方基体中的铝沿晶界发生内氧化生成Al2O3。The oxidation behaviour of Incoloy800 Halloy in 750℃ and 850℃ pure steam was investigated by discontinuous weighing method,X-ray diffraction,and scanning electron microscopy.The results show that the oxidation kinetics of the tested alloy followed a parabolic law;the oxidation accelerated rapidly with rising temperature.After oxidation in 750 ℃ steam,an oxide layer mainly composed of（Cr,Mn）_2O_3 was formed on the surface of the tested alloy,discontinuous bulgy Fe_3O_4 was distributed on the oxide layer and Cr in the matrix under the oxide layer was oxidized internally to Cr_2O_3.After oxidation in 850℃ steam,a duplex oxide layer,composed of a thin outer layer of（Fe,Mn）_3O_4 and a thick inner layer of（Cr,Mn）_2O_3,was formed on the surface of the tested alloy;beneath the oxide layer,Al was oxidized inernally to Al_2O_3 along grain boundaries in the matrix.

关 键 词：Incoloy800H合金 高温水蒸气 氧化行为 氧化膜 

分 类 号：TG172.81[金属学及工艺—金属表面处理]