Casting technology for ODS steels - the internal oxidation approach

Final LIMTECH Colloquium and International Symposium on Liquid Metal Technologies

材料科学;金属学

Miran, S.^1 ; Franke, P.^1 ; Möslang, A.^1 ; Seifert, H.J.^1

Institute for Applied Materials - Applied Materials Physics, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen

76344, Germany^1

关键词: Aluminium oxide;    Casting technology;    Inner region;    Nanometres;    Oxide scale;    Oxygen activity;    Powder mixtures;    Production route;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/228/1/012021/pdf
DOI  :  10.1088/1757-899X/228/1/012021

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The formation of stainless ODS steel by internal oxidation of as-cast steel has been investigated. An alloy (Fe-16Cr-0.2Al-0.05Y, wt.%) was embedded in a (VO/V2O3) powder mixture serving as an oxygen activity buffer and heat treated at 1450 C for 20 h. After this procedure no oxide scale was present on the surface of the sample but a zone of internal oxidation with a depth of about 2000 μm was formed in its interior. The precipitates within this zone consisted of two types of oxides. Discrete aluminium oxide particles with a size of a few micrometres were formed in outer regions of the specimen. Finer aluminium-yttrium oxides with a size of some hundred nanometres were mainly precipitated in inner regions of the sample. The results can be considered as a promising step towards an alternative production route for ODS steels.