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Structure and Oxidation Behavior of NiAl-Based Coatings Produced by Non-Vacuum Electron Beam Cladding on Low-Carbon Steel.
- Source :
- Metals (2075-4701); Oct2022, Vol. 12 Issue 10, p1679-N.PAG, 20p
- Publication Year :
- 2022
-
Abstract
- NiAl-based intermetallic coatings were obtained using non-vacuum electron beam cladding on low-carbon steel. The structure of the coatings was investigated using optical microscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), electron backscatter diffraction (EBSD), and X-ray diffraction (XRD). The coatings mostly consisted of grains elongated perpendicular to the substrates, with a strong <100> texture along the grain growth direction. The coatings contained about 14 at. % Fe, which appeared due to the partial melting of the steel substrate. At the bottom of the coatings, an inhomogeneous mixing zone with an increased concentration of Fe was formed; at the "substrate–coating" interface, a thick layer with a Fe50-Ni25-Al25 at. % composition was observed. The samples exhibited weight gains of 0.1, 0.8, 2.14, and 3.4 mg/cm<superscript>2</superscript> after 100 h of oxidation at 700, 800, 900, and 1000 °C, respectively. The oxide layer contained α-Al<subscript>2</subscript>O<subscript>3</subscript> and θ-Al<subscript>2</subscript>O<subscript>3</subscript>, and the presence of iron atoms contributed to the formation of a small amount of spinel. During the oxidation process, a layer with a high Fe content (~60 at. %) formed along the boundary between the oxide film and the NiAl-based material, which had a positive effect on the formation of a non-porous "oxide–coating" interface. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20754701
- Volume :
- 12
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Metals (2075-4701)
- Publication Type :
- Academic Journal
- Accession number :
- 159909617
- Full Text :
- https://doi.org/10.3390/met12101679