Si含量对四元Fe-20Ni-20Cr-ySi合金在900 ℃下氧化行为的影响
Effect of Si Content on Oxidation Behavior of Quaternary Fe-20Ni-20Cr-ySi Alloys in Oxygen at 900℃
冯抗抗 1任延杰 1吕云蕾 1周梦妮 1陈荐 1牛焱1
作者信息
- 1. 长沙理工大学能源与动力工程学院长沙 410076
- 折叠
摘要
研究了 Fe-20Ni-20Cr-γSi(y=0,1,3,5,质量分数,％)合金在纯氧中900℃下的氧化行为.三元Fe-20Ni-20Cr合金在氧化后表面生成了复杂的氧化膜,氧化膜对合金保护作用较差.Si含量从1％增加至3％,发生了Si从内氧化到外氧化的转变,添加Si显著提高了 Fe-20Ni-20Cr合金的抗氧化性能.其中,Fe-20Ni-20Cr-3Si和Fe-20Ni-20Cr-5Si均在Cr2O3层/合金界面形成了连续的非晶态SiO2层,阻止了 Fe、Ni和Cr的向外和氧的向内扩散的作用.4种合金中,Fe-20Ni-20Cr-3Si具有最优的抗氧化性能.
Abstract
The oxidation behavior of Fe-20Ni-20Cr-ySi(y=0,1,3,5,mass fraction,％)alloys were studied in 1 atm O2 at 900℃ for 24 h.After oxidation,Fe-20Ni-20Cr alloy without Si addition formed a complex oxide scale on the surface with poor protectiveness.When the Si content increased from 1％to 3％,a transition from internal to external oxidation of Si occurred.Therefore,additions of Si can signifi-cantly improve the oxidation resistance of the austenitic Fe-20Ni-20Cr alloy.Both Fe-20Ni-20Cr-3Si and Fe-20Ni-20Cr-5Si formed an amorphous SiO2 layer on the Cr2O3/alloy interface,and this continuous amorphous SiO2 layer provided an effective barrier to prevent the outward diffusion of Fe,Ni and Cr,as well as the inward migration of oxygen.A comparison of the oxidation behavior of alloys with different Si contents indicated that Fe-20Ni-20Cr-3Si has the most excellent oxidation resistance properties.
关键词
Fe-Ni-Cr-Si合金/硅/高温氧化/氧化动力学Key words
Fe-Ni-Cr-Si alloy/silicon/high temperature oxidation/oxidation kinetics引用本文复制引用
出版年
2024
NETL
NSTL
万方数据