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High-temperature oxidation of CrAlYN coatings: implications of the presence of Y and type of steel

AuthorsRojas, T. Cristina; Domínguez-Meister, Santiago ; Brizuela, Marta; Sánchez-López, J.C.
Issue DateSep-2018
CitationSurface and Coatings Technology, 354 (2018)
AbstractNanolayered CrAl(Y)N coatings are deposited on M2 and 316 steel substrates and heated to 1000 ºC in air for 2 h to study their oxidation mechanism, the thermal stability and the reactive element (RE) effect of yttrium. CrAlN on M2 develops a Cr2O3/Al2O3 passivation layer that preserves in high degree the fcc-CrAlN structure however iron ions leave the substrate and travel to the surface along the column boundaries. The CrAlYN (Y content 1.6 at.%) coatings deposited on steels are not stable at 1000 ºC, and the initial fcc-CrAlN phase is partially transformed to hcp-Al(O)N and Cr-Fe phases (M2) and Cr2N and Al2O3 (316). The addition of Y changes the predominant scale growth direction. Inward oxygen diffusion becomes dominant but a reduction of the oxide scale thickness as compared to CrAlN is not observed. The advanced microstructural analysis made by transmission electron microscopy combined with electron energy-loss spectroscopy determined that yttrium migrates mainly to the oxide scale (forming mixed oxides with substrate elements - V and Mo, either as dispersed particles or segregated at the grain boundaries) in M2, and to the oxide interface and column boundaries (forming Al-Y oxides and YN, respectively) in 316 steels. The benefits of addition of Y in improving the oxidation resistance are discussed comparatively with literature data. The RE effect of yttrium is thus observed to be dependent on the substrate, film architecture and composition
Publisher version (URL)http://dx.doi.org/10.1016/j.surfcoat.2018.09.020
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