Influence of Mo on High-Temperature Oxidation Behavior of La- and Zr-added 20 mass%Cr–6 mass%Al Ferritic Stainless Steels

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• 作者：Akito Mizutani ; Takuya Miura ; Mitsuyuki Fujisawa ; Shigenari Hayashi
• 关键词：High ; temperature oxidation ; Al2O3 scale ; Ferritic stainless steel ; Segregation to grain boundary
• 刊名：Oxidation of Metals
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：87
• 期：1-2
• 页码：109-124
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Metallic Materials; Inorganic Chemistry; Tribology, Corrosion and Coatings;
• 出版者：Springer US
• ISSN：1573-4889
• 卷排序：87

文摘

The influence of Mo addition on the high-temperature oxidation behavior of La or La + Zr-added 20 mass%Cr–6 mass%Al steel at 1100 °C was investigated. The oxidation rates of the La-added steel and La + Zr-added steel were found to be increased by the addition of Mo. In both steels, the increase in the growth rate of columnar layers was more noticeable than that of equiaxed layers in the Al₂O₃ scales. The segregation of La to the Al₂O₃ grain boundaries of 5Mo steel was lower than that observed in 0Mo steel. It is suspected that the increase in oxidation rate caused by Mo addition arose from the suppression of La segregation, which controls the diffusivity of O and Al ions at Al₂O₃ grain boundaries. These results suggested that the addition of Mo reduced the activity of La in the steel.