Scaling Kinetics and Scale Microstructure of Chromia Scales Formed on Ni-25%Cr Model Alloy during Oxidation in H2o-Containing High and Low pO2 Test Gas at 1000°C
Scaling Kinetics and Scale Microstructure of Chromia Scales Formed on Ni-25%Cr Model Alloy during Oxidation in H2o-Containing High and Low pO2 Test Gas at 1000°C
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结垢%20Kinetics%20and%20Scale%20微观结构%20of%20Chromia%20Scales%20Formed%20on%20Ni-25%Cr%20Model%20Alloy%20during%20Oxidation%20in%20H2o-Containing%20High%20and%20Low%20pO2%20Test% 20气体%20at%201000℃
DOI：
10.1149/06618.0001ecst
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M. Hänsel
中科院分区：
文献类型：
--
作者：
M. Hänsel
采用JuSie-methodology研究了Ni-% 25 Cr模型合金的等温氧化行为，即在1000 ℃下，在干燥和湿N2- 1%O2以及Ar-7%H2O中，对每种特定的试验气体成分使用不同厚度的试样。氧化机制进行了评估，使用热重和SEM/EBSD分析的氧化皮截面。离子束抛光的氧化物截面进行了分析的氧化物晶粒生长和新的氧化物在氧化物-气体界面的成核速率。这一发现可以通过考虑H缺陷和尺度应力状态对铬亚晶格中点缺陷浓度的影响来解释。
The isothermal oxidation behaviour of a Ni-% 25Cr model alloy was studied employing the JuSie-methodology, ie using specimens of different thickness for each specific test gas composition at 1000 C in dry and wet N2-1% O2 as well as in Ar-7% H2O. The oxidation mechanisms were evaluated using thermogravimetry and SEM/EBSD analyses of oxide scale cross sections. The ion beam polished oxide cross-sections were analysed in terms of oxide grain growth and nucleation rates of new oxide at the oxide-gas interface. The findings can be explained by considering the effect of H-defects and in-scale stress state on point defect concentrations in the chromium sub-lattice.