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000279594 1001_ $$0P:(DE-Juel1)139042$$aJalowicka, Aleksandra$$b0$$eCorresponding author
000279594 245__ $$aEffect of Specimen Thickness on Microstructural Changes During Oxidation of the NiCrW Alloy 230 at 950-1050°C
000279594 260__ $$aNew York, NY$$bSpringer Science + Business Media$$c2015
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000279594 520__ $$aAn accurate procedure for predicting oxidation-induced damage and lifetime limits is crucial for the reliable operation of high-temperature metallic components in practical applications. In order to develop a predictive oxidation lifetime model for Ni–Cr alloys, specimens of wrought NiCrW alloy 230 with different thicknesses were cyclically oxidized in air at 950–1050°C for up to 3000 h. After prolonged exposure, two types of carbides as well as a Cr-rich nitride (π-phase) precipitated in the γ-Ni matrix. The oxidation-induced loss of Cr from the alloy resulted in the formation of subscale zones, which were free of the Cr-rich carbide and nitride but also of the Ni-W rich M6C. The width of the M6C-free zone was smaller than that free of the Cr-rich precipitates. Thermodynamic and diffusion calculations of the observed time- and temperature-dependent Cr depletion processes identified that back diffusion of C occurred which resulted in an increased volume fraction of M23C6 in the specimen core. With increasing time and temperature, the amount of π-phase in the specimen core increased. The subscale depletion of the initially present Cr-nitrides and the formation of Cr-nitrides in the specimen center is believed to be related to a mechanism which is qualitatively similar to that described for the Cr carbide enrichment. However, with increasing time and decreasing specimen thickness, N uptake from the atmosphere becomes apparent. As a result, the precipitates present in the specimen center eventually consisted almost exclusively of nitrides
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000279594 7001_ $$0P:(DE-Juel1)156492$$aDuan, Ran$$b1
000279594 7001_ $$0P:(DE-Juel1)129727$$aHuczkowski, Pawel$$b2
000279594 7001_ $$0P:(DE-Juel1)129701$$aChyrkin, Anton$$b3
000279594 7001_ $$0P:(DE-Juel1)145209$$aGrüner, Daniel$$b4
000279594 7001_ $$0P:(DE-HGF)0$$aPint, B. A.$$b5
000279594 7001_ $$0P:(DE-HGF)0$$aUnocic, K. A.$$b6
000279594 7001_ $$0P:(DE-Juel1)129782$$aQuadakkers, Willem J.$$b7
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