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Oxidation behavior of Ni2Al-0.1B containing 2Cr

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Abstract

Ni 3 Al-0.1B containing 2% Cr was subjected to a thermal cycling oxidation test in pure flowing oxygen at atmospheric pressure at temperatures cycled between 400 and 1300 K. Scales formed on the alloy spalled repeatedly after several tens of cycles, resulting in a considerable mass loss of mass of the specimen. The isothermal oxidation behavior of the alloy was also studied at temperatures of 1300, 1400, and 1500 K in the same oxidizing atmosphere. Characteristic breakaway oxidation caused by extensive scale blistering was observed at 1300 and 1400 K after a protective period of about 50 ksec, whereas the oxidation at 1500 K followed a parabolic law without any significant blistering. Particularly at 1300 K, the alloy grain boundaries provided favorable sites for blistering. The influence of Cr may be explained by the modification of mechanical property of the scale.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, Faculty of Engineering, Osaka University, Suita, 565, Osaka, Japan

    Shigeji Taniguchi & Toshio Shibata

Authors
  1. Shigeji Taniguchi
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  2. Toshio Shibata
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Taniguchi, S., Shibata, T. Oxidation behavior of Ni2Al-0.1B containing 2Cr. Oxid Met 28, 155–163 (1987). https://doi.org/10.1007/BF00656704

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  • DOI: https://doi.org/10.1007/BF00656704

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