Abstract
Additions of 3 wt.% Mn and 3 wt.% Si were made to Ni-20Cr. These alloys, along with Ni-20Cr and Ni-40Cr were oxidized for 100 1-hr cycles at 1100°C and 50 1-hr cycles at 1200° C. Oxidation behavior was judged by sample weight and thickness change, metallography, x-ray diffraction, and electron microprobe analysis. These tests showed that Ni-40Cr and Ni-20Cr-3Si were about the same and were the most oxidation-resistant alloys. Ni-20Cr-3Mn was not as oxidation resistant, especially at 1200° C. Ni-20Cr was far less oxidation resistant than any of the other alloys. The Ni-40Cr and Ni-20Cr-3Si relied on a protective layer of Cr2O3 for their oxidation resistance. A SiO2 layer was noted beneath the Cr2O3 layer on the Ni-20Cr-3Si, but had apparently only a second-order effect. The source of improved protection of the Ni-20Cr-3Mn was apparently the formation of a relatively adherent MnCr2O4 layer at the metal-oxide interface.
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Lowell, C.E. Cyclic and isothermal oxidation behavior on some Ni-Cr alloys. Oxid Met 7, 95–115 (1973). https://doi.org/10.1007/BF00611450
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DOI: https://doi.org/10.1007/BF00611450