Proceedings/Recueil Des Communications Année : 2024

Spark Plasma Sintering of Nickel-Based Superalloys: A New Route to Produce Dual-Alloy Turbine Disks

Résumé

Spark Plasma Sintering was used to join powders of two nickel-based superalloys containing over 40% volume fraction of γ’ phase and considered very difficult to weld. After 1 min of sintering, a very high relative density was reached, and both alloys were successfully solid-state joined without precipitation of detrimental phases in the diffusion-affected zone. Solutioning of samples showed that a dual-alloy microstructure, composed of a coarse-grained alloy in the rim and a fine-grained alloy in the core, could be produced by this technique. In both as-received and fully-heat-treated states, assemblies exhibit tensile strengths at least higher than the weakest parent material. The heat-treatment sequence enables modulating strain partitioning during tension, leading to a more homogeneous deformation at very high stresses. Thus, failure occurs in the weakest parent material, far from the weld, with no alteration of the ductility, suggesting a sound joint has been produced during the short sintering time. The study on the viscoplastic response by means of tensile stress relaxation tests shows that a dual-alloy disk technology has a high potential, resulting in improved creep properties, chemical stability, and corrosion resistance in the rim section.

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Dates et versions

hal-05407382 , version 1 (09-12-2025)

Identifiants

Citer

Emmanuel Saly, Patrick Villechaise, David Mellier, Pierre Sallot, Amélie Caradec, et al.. Spark Plasma Sintering of Nickel-Based Superalloys: A New Route to Produce Dual-Alloy Turbine Disks. Proceedings of the 15th International Symposium on Superalloys 2024, Sep 2024, Seven Springs Mountain Resort, Champion, Pennsylvania, France. Springer Nature Switzerland, pp.242-252, 2024, The Minerals, Metals & Materials Series, 978-3-031-63936-4. ⟨10.1007/978-3-031-63937-1_23⟩. ⟨hal-05407382⟩
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