Effects of Rare Earth Metal Ce Additions on the 1150°C Isothermal Oxidation Behavior of Ni-20Cr Alloy

Abstract:

Isothermal oxidation behavior was investigated for Ni-20Cr alloy with addition of different Ce 0 (wt)%, 0.042(wt)% and 0.094(wt)% at 1150°C for 100h.The surface and cross-section microstructures of the oxide scales were analyzed by EPMA(Eelectron Probe Micro-Analysis). The addition of Ce in Ni-20Cr alloy may improved the cohesion between the matrix and the oxide scales significantly and increased the oxidation resistance of Ni-20Cr alloy. Compared with 0 (wt)%Ce and 0.042(wt)% Ce in Ni-20Cr alloys, the oxide scales on Ni-20Cr alloy with addition of 0.094(wt)% Ce showed compact, which limited the internal oxidation.The cross-section microstructure of oxide scales presented three complicated oxide layers, which were Cr₂O₃, SiO₂ and Al₂O₃ from the oxide scales to the matrix.

• Periodical: Advanced Materials Research (Volume 771)
• Pages: 23-27
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.771.23
• Online since: September 2013
• Authors: Hong Qiang Nan, Jin Shan Li, Rui Hu, Liang Yuan, Hong Chao Kou, Tie Bang Zhang
• Keywords: Ce Element, Ni-20Cr Alloy, Oxide Scale, Sothermal Oxidation Behavior

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