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Article Dans Une Revue Australian Journal of Science and Technology Année : 2021

Oxidation of a 4 wt.% Hf-containing nickel-based alloy at temperatures ranging from 1100°C to 1250°C in air

Résumé

The needs of metallic alloys able to work at elevated temperatures in severe conditions of applied mechanical stresses and chemical aggressivity of the environment is increasing more and more. For service temperatures equal to, or higher than, 1100°C, new superalloys must developed because of the loss in strengthening particles known by g/g' single crystals at so high temperatures, or the difficult availability of Oxide Dispersion Strengthened superalloys for geometrically complex hot components. Traditional metallurgical solutions are still a source of new superalloys development if innovative phases can be obtained in the microstructures. Carbides with complex constitutions represent a possible long-lasting strengthening system in cast polycrystalline alloys which are the most adapted alloys to produce coarse-grained complex pieces. In this work this is the (Hf, Ta) C strengthening system in a chromia-forming austenitic nickel-based matrix which was under interest. Interesting creep resistance at high temperature (e.g. 1100°C) were recently observed. In order to evaluate the chemical resistance at the same temperature for this type of materials, the same alloy was here exposed to synthetic air at 1100°C during 50 h in a thermobalance, followed by the post-mortem characterization of the oxidized states. To explore its oxidation resistance to more elevated temperatures this test was carried out 2 times more, at 1200°C and 1250°C. For these three temperatures this alloy well behaved in hot oxidation was good: chromia-forming behavior, rather slow oxidation kinetics and acceptable resistance against oxide scale spallation when cooling.
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Dates et versions

hal-03725728 , version 1 (18-07-2022)

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Paternité - Pas d'utilisation commerciale

Identifiants

  • HAL Id : hal-03725728 , version 1

Citer

Patrice Berthod, Dame Assane Kane, Lionel Aranda. Oxidation of a 4 wt.% Hf-containing nickel-based alloy at temperatures ranging from 1100°C to 1250°C in air. Australian Journal of Science and Technology, 2021, 5 (4), pp.686-693. ⟨hal-03725728⟩
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