Influence of grain orientation on the incipient oxidation behavior of Haynes 230 at 900°C

Ni-based superalloy Haynes 230 is used in many applications such as very high temperature reactor (VHTR) or solid oxide fuel cells (SOFCs) where it is exposed to high temperature service environment. In order to improve the resistance for high temperature oxidation, the effect of crystallographic or...

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Bibliographic Details
Published in:Materials characterization 2015-09, Vol.107, p.33-42
Main Authors: Wang, Xu, Fan, Fan, Szpunar, Jerzy A., Zhang, Lina
Format: Article
Language:English
Subjects:
ALLOYS
ANISOTROPY
ATOMIC FORCE MICROSCOPY
Atomic force microscopy (AFM)
BACKSCATTERING
CORRELATIONS
CRYSTALLOGRAPHY
Deviation angle
Electron backscattering diffraction (EBSD)
ELECTRON DIFFRACTION
GRAIN ORIENTATION
HAYNES ALLOYS
MATERIALS SCIENCE
Ni-based superalloy
OXIDATION
SOLID OXIDE FUEL CELLS
SURFACES
TEMPERATURE RANGE 1000-4000 K
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Summary:Ni-based superalloy Haynes 230 is used in many applications such as very high temperature reactor (VHTR) or solid oxide fuel cells (SOFCs) where it is exposed to high temperature service environment. In order to improve the resistance for high temperature oxidation, the effect of crystallographic orientation on the early stage oxidation was investigated. It was demonstrated that different oxide thicknesses are formed on grains having different orientations. Comparison of electron backscatter diffraction (EBSD) orientation maps before and after oxidation at 900°C indicates that grains near (111) orientation, especially with the deviation angle from that is smaller than 20°, are more oxidation resistant than grains of other orientations. Correlation between the results of electron backscatter diffraction (EBSD) and atomic force microscopy (AFM) was used to compare the oxidation rate of grains having different crystallographic orientation. The oxidation rate was found to change with the crystallographic orientation as follows (111)
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2015.06.029