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High-temperature oxidation behavior of a wrought Ni-Cr-W-Mn-Si-La alloy

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Abstract

An investigation was carried out to study the kinetics and products of oxidation of a wrought Ni−Cr−W−Mn−Si−La alloy at temperatures in the range of 950 to 1150°C. Oxidation kinetics were evaluated from measurements of weight change, metal loss, and internal penetration. Analytical electron microscopy, scanning electron microscopy, electron probe microanalysis, and X-ray diffraction were used to characterize the scale microstructure. Initially, La was observed to segregate within a surface layer of about 5 μm thick, which promoted selective oxidation of Cr and Mn. Oxidation kinetics were found to follow a parabolic-rate law with an activation energy of about 232kJ/mol. During steady-state oxidation, the scale consisted of an inner adherent layer of α-Cr2O3 modified by the presence of La and Si, and shielded by an outer layer of MnCr2O4. Most of the La was segregated to grain boundaries of the α-Cr2O3 scale, however, Si was homogeneously distributed. It was concluded that the characteristic oxidation resistance of the alloy was related to the synergistic effects of Ni and Cr and to the effective minor additions of La, Si, and Mn; however, the useful life of the scale was limited by rupture and surface depletion in Cr, leading to accelerated internal oxidation.

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  1. Materials Characterization Laboratory, Metrology, Standards and Materials Division, Research Institute, King Fahd University of Petroleum and Minerals, 31261, Dhahran, Saudi Arabia

    H. M. Tawancy

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Tawancy, H.M. High-temperature oxidation behavior of a wrought Ni-Cr-W-Mn-Si-La alloy. Oxid Met 45, 323–348 (1996). https://doi.org/10.1007/BF01046988

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