摘要
研究了Ar-21vol.%O2-15 vol%H2O气氛中逆变奥氏体对Fe-13Cr-5Ni合金在700℃氧化物形成的影响。结果表明,全马氏体和含逆变奥氏体样品均形成双层氧化膜结构,氧化物由包含Fe2O3和Fe3O4的外层及(Fe,Cr,Ni)3O4内层构成。含逆变奥氏体样品氧化膜外层中Fe2O3含量很少但比较致密,而Fe3O4中含有大量的孔洞;氧化膜内层中Ni与Cr含量呈现此消彼长的变化趋势。水蒸气的引入使含逆变奥氏体样品的氧化增重明显高于全马氏体样品。逆变奥氏体的存在阻碍Cr的选择性氧化。水蒸气加速合金氧化速率的影响对奥氏体相更明显,奥氏体相中氧渗透率的提高程度远高于马氏体相。
The effect of reversed anstenite on the oxide formation of Fe-13Cr-5Ni alloy in Ar-21 vol% O2-15 vol% H2O was investigated at 700℃. The results indicated that, both of the scales formed on the full martensite and reversed austenite containing alloys exhibited a duplex structure, Fe2O3 and Fe3O4 formed as the outer scale in combination with an （Fe, Cr, Ni）3O4 inner scale. Fe2O3 in the outer scale formed on the reversed austenite containing alloy was small in content but large in density, while Fe3O4 formed with a large number of voids; the content of Ni and Cr in the inner scale showed the shift in trends with a Cr enrichment in the intergranular oxides. The oxidation weight gain of the reversed austenite containing alloy was significantly higher than the full martensite alloy in the presence of water vapor. The presence of reversed austenite hindered the selective oxidation of Cr. The oxidation rate was accelerated by water vapor, which made a strong influence on austenite phase. The increase of oxygen permeability by water vapor was much higher in austenite than martensite.
出处
《陶瓷学报》
CAS
北大核心
2015年第5期501-505,共5页
Journal of Ceramics
基金
国家核电技术公司员工自主创新项目专项资金(编号:SNP-KJ-CX-2013-5)
关键词
逆变奥氏体
高温氧化
水蒸气
氧渗透率
reversed austenite
high temperature oxidation
water vapor
oxygen permeability
