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At high temperaturesHigh temperature, the Cantor alloyCantor alloy is severely oxidized in air, with the formation of many different types of oxides as this can be observed after test by post-mortem metallographic characterizationMetallographic characterization. It can be interesting to better know the sequences of appearance of these different oxides all along the exposure to hot air, in order to better specify the roles of each of the five elements present in a Cantor alloyCantor alloy. This was done in the present work with the oxidation by laboratory air in a resistive tubular furnace, at 1000 °C for seven different durations ranging from 1.5 to 62 h. The progressive oxidation states were characterized by SEM observation of the outer side of the scales, and by cross-sectional examination of the whole thickness of the scale as well as the chemical changes in subsurface. It appears that the composition of the external scale observed after only few hours is globally the same as after several tens hours. Only the average thickness and the intergranular oxidation penetration, respectively, increases and deepens with time, as well the Mn and Cr impoverishment of subsurface.

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Metallographic Follow-Up of the Oxidation Progress with Time of Cast Cantor Alloy at 1000 °C

  • 会议论文

  • 发表日期：

    2025年

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  • Lyna Amrouche,
  • Romin Chevalme,
  • Siouare Hammi,
  • Yasmina El Hadad,
  • Erwan Etienne,
  • Patrice Berthod

摘要

At high temperaturesHigh temperature, the Cantor alloyCantor alloy is severely oxidized in air, with the formation of many different types of oxides as this can be observed after test by post-mortem metallographic characterizationMetallographic characterization. It can be interesting to better know the sequences of appearance of these different oxides all along the exposure to hot air, in order to better specify the roles of each of the five elements present in a Cantor alloyCantor alloy. This was done in the present work with the oxidation by laboratory air in a resistive tubular furnace, at 1000 °C for seven different durations ranging from 1.5 to 62 h. The progressive oxidation states were characterized by SEM observation of the outer side of the scales, and by cross-sectional examination of the whole thickness of the scale as well as the chemical changes in subsurface. It appears that the composition of the external scale observed after only few hours is globally the same as after several tens hours. Only the average thickness and the intergranular oxidation penetration, respectively, increases and deepens with time, as well the Mn and Cr impoverishment of subsurface.