Article Dans Une Revue Canadian Metallurgical Quarterly Année : 2021

Behaviour in oxidation at 1200°C of two nickel-based alloys reinforced by (Ta, Hf)-C carbides

Résumé

Contrarily to gamma/gamma prime nickel-based single crystals, some carbidesstrengthened polycrystalline superalloys can stay still efficiently helped by their reinforcing particles to resist creep deformation at temperatures higher than 1100°C. Various MC carbides recently demonstrated such potential interest if they are present in quantity high enough. Among them, HfC monocarbides are remarkable by their morphological resistance to heat, and thus by their strengthening effect on long term. Unfortunately, several weight percent of the expensive Hf element may cause problems. In this work, two limited replacements of Hf by Ta in a Ni-Cr alloy are envisaged for a base of 6 wt.%M (M=Hf+Ta). Microstructure resistance to changes and oxidation properties are investigated at 1200°C. Results shiw that, after 50 hours spent at 1200°C, microstructures have a little more evolved than a HfC-reinforced Ni-based superalloy studied earlier. In contrast the oxidation behaviors stayed good, except the resistance against oxide spallation at cooling if the Ta content becomes higher than the Hf one. An optimum may be found close to equal contents between Hf and Ta.

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hal-04770630 , version 1 (07-11-2024)

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Patrice Berthod, Assane Kane, Lionel Aranda. Behaviour in oxidation at 1200°C of two nickel-based alloys reinforced by (Ta, Hf)-C carbides. Canadian Metallurgical Quarterly, 2021, 60 (3), pp.183-195. ⟨10.1080/00084433.2021.2001298⟩. ⟨hal-04770630⟩
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